Master and Diploma Students

Meet our Master and Diploma students and learn about their theses:


Ivo Tomedi

Ivo Tomedi

E-Mail: Ivo.Tomedi@student.uibk.ac.at

Thesis title:
Rainout shelter: Analyses on stems of Picea abies, Fagus sylvatica and Larix decidua upon drought stress during the summer.

Supervisors:
Stefan Mayr, RG Ecophysiology, Innsbruck University

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Project description:

Droughts are one of the major limiting factors for plants, especially in trees due to their longevity, and more frequently occurring droughts associated to climate change are noticed.Large-scaled experimental approaches are often difficult to realize due to high cost and effort. However, two rainout shelter experiments are available for planned research upon drought stress on trees: (i) ‘Kranzberg Forest Freising’ and (ii) ‘Kaserstattalm Stubaital’. In both sites, artificial droughts through rain exclusion are simulated during the summer.
The aim of this master thesis is to investigate the site- and species-specific (Kranzberg: Picea abies and Fagus sylvatica, Kaserstattalm: Picea abies and Larix decidua) effect of droughts on test-trees compared to control-trees. Using electrical resistivity tomography, it is possible to observe the water distribution in the stem xylem. In addition, embolism formation and mechanical stability may be analysed via ultrasonic emission and stem movement sensors. Acquired data will be interpreted based on datasets from previous years of rain exclusion.






Charlotte Permann

Charlotte Permann

E-Mail: Charlotte.Permann@student.uibk.ac.at

Thesis title:
Cytophysiological examination of Zygnema cricumcarinatum (SAG 698-1a and 698 1b) on their capability of conjugation and comparison to field samples

Supervisors:
Andreas Holzinger, RG Plant Cell Biology, Innsbruck University

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Project description:

This master thesis deals with three main questions about the physiology and cell-biology of streptophytic green algae. A) Structural and physiological characterisation of Zygnema cricumcarinatum SAG strains 698-1a and 698-1b, B) Experiments on their capability of conjugation, C) Field samples to find conjugation or zygotes of Zygnematophyceae.

ad A) The isolates ordered by the SAG (collection for algae culture, Göttingen) shall be morphologically characterized via light- and electron microscope.

ad B) Both strains are described as being able to conjugate, which could not be achieved by recent experiments. Because it is unknown, if the strains lost their capability to conjugate or unsuitable conditions were applied, new experiments shall be conducted.

Ad C) Different conjugating Zygnematophyceaen have been found outdoors (Kühtai, Obergurgl), therefore field samples shall be taken and their morphology studied and documented.






Elisa La Regina

Elisa La Regina

E-Mail: Elisa.La-Regina@student.uibk.ac.at

Thesis title:
Heat resistance of foothill and alpine ecotypes of A. arenosa originating from 16 different populations (and the direct application at school)

Supervisors:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University

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Project description:

In mountain areas, habitat heterogeneity can lead to the formation of new ecotypes. This is the case for Arabidopsis arenosa (L.) Lawalrée, a species that is widely distributed in the Alps and Carpathians. Several genetically distinct high alpine populations have evolved from their respective foothill populations. At natural sites, individuals from these populations differ in their phenotype. Whether these phenotypic differences are stable, i.e. adaptive, or of acclimative nature is unknown. A. arenosa, is an extremophyte. The heat resistance of the species is currently unknown.
In this diploma thesis, ecotypic differentiation of heat resistance of A. arenosa under the influence of foothill and alpine environmental conditions is investigated on plants cultivated in common gardens. This should yield stable adaptative or acclimative traits related to heat resistance.
In the didactical part of the thesis this topic will be prepared age group specific for school education.

The Diploma thesis is part of the FWF Project P31027-BBL.






Nils Bertol

Nils Bertol

E-Mail: Nils.Bertol@student.uibk.ac.at

Thesis title:
Plant communities along altitudinal transects at GLORIA summits in the Dolomites

Supervisors:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University

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Project description:

High altitude species in the Alps are considered to be particularly sensitive to climate change: up to 50% are expected to go extinct by the end of the 21st century due to competitive displacement by newly invading low-altitude species. This master thesis continues the monitoring of the GLORIA sites in the Dolomites, started in 2001, and analyses the plant communities at the southern slopes from the treeline to the GLORIA-permanent plots. According to the GLORIA results, the south-facing slopes are those with the highest changes. The study aims to highlight the potential migration of species and species groups towards the summits and to get information on the distribution of the species along the slopes.






Maximilian Lübben

Maximilian Lübben

E-Mail: Maximilian.Luebben@student.uibk.ac.at

Thesis title:
Vegetationskundliche Untersuchung der Trockenrasen im Unteren, Mittleren und Oberen Vinschgau

Supervisors:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University

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Project description:

The xerophytic grasslands in the inner-alpine dry valley originated post-glacially. Because of their biogeographical location and topography, these grasslands contain a unique and very rich flora. This floristic and faunistic richness makes these habitats highly valuable. The so-called Vinschgauer Leiten are the most important inner-alpine xerophytic grasslands in the Eastern Alps.
In the past, a complete vegetation map of the Vinschgauer Leiten was created. To get an up-to-date picture of the Vinschgauer dry grasslands and to record any changes in vegetation, it is necessary to repeat the surveys. This is aimed in this master's thesis.






Sandra Kistl

Sandra Kistl

E-Mail: Sandra.Kistl@student.uibk.ac.at

Thesis title:
Neophyten als Trachtpflanzen bei Apis mellifera: eine Fallstudie im Raum Kundl (Tirol)

Supervisors:
Klaus Oeggl, RG Palynology and Archaeobotany, Innsbruck University

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Project description:

Invasive plants often occur in large numbers and thus displace native plant species. This is why they are considered negative. Anyhow, insects like Apis mellifera may benefit from alien plants due to a higher production of pollen, nectar and sugar. In this study the distribution of Buddleja davidii, Fallopia japonica, F. bohemica, F. sachalinensis, Impatiens glandulifera, I. parviflora und Senecio inaequidens in the area of Kundl (Tirol) and its role as pollen source for Apis mellifera is investigated. The following questions are studied: i) whether Apis mellifera carnica collects pollen from the selected alien plants and ii) how much it does contribute to the collected pollen flora or honey.






Jacob Geier

Jacob Geier

E-Mail: Jacob.Geier@student.uibk.ac.at

Thesis title:
Pollen Provenience in Honey Bee Pollen Panties from the Meran Region, South Tyrol

Supervisors:
Jean Nicolas Haas, RG Palynology and Archaeobotany, Innsbruck University

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Project description:

Pollen is the only protein source for the European Honeybee (Apis mellifera) and therefore very important for their nutrient supply. In areas with an intensive use of plant protection products against phytopathogens, pollen can be contaminated with those substances, with some of them being harmful to bees. Collecting such pollen can have a negative influence on the vitality and development of the bee hives.
Previous studies from the Research Center Laimburg have shown residues of different plant protection products on the pollen collected by bees. The aim of this study is to get more information about the origin of the collected pollen, using vegetational analyses together with morphological determination of the pollen grains. The focus is on distinguishing pollen from species growing inside cultivated areas from pollen deriving of species growing in mostly natural habitats around the orchards.






Dennis Schröter

Dennis Schröter

E-Mail: Dennis.Schroeter@student.uibk.ac.at

Thesis title:
Heat resistance of buds of alpine tree species

Supervisors:
Stefan Mayr, RG Ecophysiology, Innsbruck University

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Project description:
Das Waldbrandrisiko wird, selbst in humiden Gebieten wie den Zentralalpen, mit fortschreitendem Klimawandel immer größer. Das Wissen um die Widerstandsfähigkeit zentraleuropäischer Bäume gegenüber Waldbränden ist jedoch sehr gering. Im Rahmen der Masterarbeit soll die thermische Verwundbarkeit und der Isolationsschutz der Knospen von Baumarten alpiner Ökosysteme (Abies alba, Larix decidua, Picea abies, Pinus sylvestris, Pinus cembra, Acer pseudoplatanus, Betula pendula, Fagus sylvatica, Fraxinus excelsior, Sorbus aucuparia) untersucht werden. Mit Hilfe der Electrolyte – Leakage – Methode (ELM) soll die Hitzeschädigung der Knospen bei verschiedenen Temperaturen quantifiziert und kritische Schwellenwerte modelliert werden. Die Isolationseigenschaften werden durch das Erhitzen der Knospen in einer experimentellen Temperaturfahne (200 °C) getestet. Zusätzlich werden Parameter wie Knospenentwicklung, Wassergehalt, Dichte, Knospenoberfläche und -durchmesser aufgenommen um spezifische Aussagen zum Isolationsverhalten treffen zu können. Die Erhebungen sollen helfen, das Risiko von Hitzeschäden der Knospen bei Waldbränden abzuschätzen.






Patrick Fleischer

Patrick Fleischer

E-Mail: Patrick.Fleischer@student.uibk.ac.at

Thesis title:
Pre- and post-harvest stress treatments of Primula veris and analysis of phytochemical implications

Supervisors:
Ilse Kranner, RG Plant Biochemistry and Metabolism, Innsbruck University

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Project description:
Pflanzen als Arzneimittel sind nicht nur traditionell in Verwendung, sondern auch zunehmend im Fokus universitärer und privater pharmazeutischer Forschung. Diese Arbeit wird in Kooperation und mit Finanzierung der Bionorica research GmbH durchgeführt. Diese Masterarbeit soll sich mit der echten Schlüsselblume (Primula veris) beschäftigen, die als Stammpflanze der pharmazeutischen Drogen Primulae flos cum calycibus (P. veris Blüten) und Primulae radix (Primelwurzeln) dient. Im Rahmen der Arbeit werden P. veris-Pflanzen verschiedenen Stressfaktoren wie UV-Licht, Trockenstress (vor und nach Ernte) oder Änderungen des Boden-pH-Wertes ausgesetzt. Die Auswirkungen auf das phytochemische Profil der Pflanzen werden hauptsächlich mittels multivariater Auswertung von LC-MS-Daten (Flüssigchromatographie, gekoppelt mit einem hochauflösenden Massenspektrometer) ermittelt.






Joelle Kröll

Joelle Kröll

E-Mail: Joelle.Kroell@student.uibk.ac.at

Thesis title:
Speciation, introgression and morphological variability in the Pyrenean endemic Saxifraga pubescens

Supervisors:
Peter Schönswetter, RG Evolutionary Systematics, Innsbruck University
Pau Carnicero Campmany, RG Evolutionary Systematics, Innsbruck University

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Project description:

Saxifraga pubescens is an alpine plant endemic to the Pyrenees, occurring in crests, peaks and exposed rocks in the highest parts of the range. According to local Floras, two subspecies with allopatric distributions are recognised: subsp. pubescens and subsp. iratiana. However, recent fieldwork has revealed 1) populations with unclear identification and 2) a non-allopatric distribution pattern among the two subspecies. Furthermore, hybridization with other co-occurring Saxifraga seems to takes place. Saxifraga pubescens is a good model species to contribute to the little known biogeographical history of the Pyrenean alpine plants. Since the species is protected in some sites both in Spain and France, it is necessary to clarify the intraspecific systematics of S. pubescens. With the present master thesis, we will integrate molecular and morphological data to infer the evolutionary and biogeographical history of the species and to propose a congruent systematics framework. In addition, we will use species distribution models (SDMs) to delimit the ecological preferences of the species and its subspecies and to discuss about their future conservation in the context of climate change.






Alexander Flörl

Alexander Flörl

E-Mail: Alexander.Floerl@student.uibk.ac.at

Thesis title:
Ice management and freeze-dehydration of plants

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University

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Project description:

Die Untersuchungen sind in das FWF Projekt P30139-B32 eingebunden und sollen klären, inwieweit die Zellwandelastizität eine Rolle für die Zellentwässerung beim Gewebegefrieren spielt. Dazu wird das Gefrierverhalten von Mesophyllzellen von Pflanzenarten mit kontrastierender Blattanatomie untersucht.
Blattanatomische Parameter, wie Zellgrößen, Zellwanddicken, und Interzellularenvolumen (u.a.) werden quantifiziert. Über die Druck-Volumen-Technik wird die Zellwandelastizität psychrometrisch erfasst.
Die Dynamik und das Ausmaß der Gefriercythorrhyse diverser Mesophyllzellen wird cryomikroskopisch erfasst und soll mit den strukturellen Parametern in Beziehung gesetzt werden.






Anna-Lena Strasser

Anna-Lena Strasser

E-Mail: Anna-Lena.Strasser@student.uibk.ac.at

Thesis title:
Ice management and freeze-dehydration of plants cells

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University

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Project description:

Im Rahmen dieser Diplomarbeit werden fundierte Kenntnisse zum Gefrierverhalten von Trachycarpus fortunei und Pinus mugo erworben. Pflanzen sind sessil und den abiotischen Umweltfaktoren, wie zum Beispiel Frost in vollem Ausmaß ausgesetzt.
Diese Thematik wird im didaktischen Teil altergruppenspezifisch für den Unterricht aufbereitet.
Die Forschung ist in das FWF Projekt P30139-B32 eingebunden.






Dominik Regele

Dominik Regele

E-Mail: Dominik.Regele@uibk.ac.at

Thesis title:
Do morphology and genetics allow for the discrimination of two entities in the alpine cloudberries (Vaccinium uliginosum agg., Ericaceae)

Supervisor:
Peter Schönswetter, RG Evolutionary Systematics, Innsbruck University

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Project description:

Die Rauschbeere (Vaccinium uliginosum agg.) ist ein Zwergstrauch, der in Hochmooren und in alpinen Zwergstrauchheiden häufig vorkommt. Die Pflanzen sehen je nach Standort sehr unterschiedlich aus, aber es war lange nicht klar, ob es sich dabei um unterschiedliche Arten handelt, oder ob die Ökologie den Phänotypen so stark prägt. Dementsprechend widersprüchlich wurden die beiden Gruppen in der Literatur geführt.
Deshalb haben wir, zusammen mit Michael Grünebach, einem Diplomstudenten von Brigitta Erschbamer, Individuen aus vielen Populationen vom Alpenvorland bis an den südlichen Alpenrand gesammelt. Ich habe im Rahmen meiner praktischen Arbeit genetische Marker untersucht, Genomgrößen mittels Flow-Zytometrie bestimmt und morphologische Merkmale wie Blatt-Dimensionen gemessen, sowie diese Daten anschließend ausgewertet.
Die statistische Aufarbeitung der ökologischen und pflanzensoziologischen Daten aus dem Freiland in Kombination mit genetischen Analysen und Messungen von morphologischen Merkmalen erlaubten es, eine erste Antwort auf diese Frage zu geben: Es handelt sich um zwei genetisch getrennte Gruppen, die aber in einem Übergangsgebiet aufeinandertreffen und sich dort durch ökologische Einflüsse zum Verwechseln ähnlich sehen.

Publications:






Matthias Hepp

Matthias Hepp

E-Mail: Matthias.Hepp@student.uibk.ac.at

Thesis title:
Muster im Keimungsverhalten ausgewählter alpiner Pflanzen.

Supervisor:
Brigitta Erschbamer, Population Biology and Vegetation Ecology

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Coming soon.





Iris_Trenkwalder.jpg

Iris Trenkwalder

E-Mail: Iris.Trenkwalder@student.uibk.ac.at

Thesis title:
Die Pflanzengesellschaften der Texelgruppe entlang von Höhengradienten und deren Veränderung über die Zeit

Supervisor:
Brigitta Erschbamer, Population Biology and Vegetation Ecology

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Project description:

Aufgrund des Klimawandels ändert sich das Vegetationsmuster der alpinen Stufe. Diese Veränderungen werden im Zuge dieser Masterarbeit auf der Ebene von Pflanzengesellschaften untersucht. Dazu werden Vegetationsaufnahmen in der Texelgruppe (Südtirol) durchgeführt und mit früheren Aufnahmen verglichen.





Andreas Guggenberger

Andreas Guggenberger

E-Mail: Andreas.Guggenberger@student.uibk.ac.at

Thesis title:
Infection of the needle bladder rust (Chrysomyxa rhododendri) on Norway spruce (Picea abies): relations between drought stress and susceptibility

Supervisors:
Stefan Mayr, RG Ecophysiology, Innsbruck University
Andrea Ganthaler, RG Ecophysiology, Innsbruck University

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Project description:

Infections of the needle bladder rust (Chrysomyxa rhododendri) on Norway spruce (Picea abies) have increased substantially in recent years (GANTHALER et al. 2014) and monitoring-efforts (ZOTTELE et al. 2014) were consequently made. The fungus exhibits a complex life-cycle, including a host shift between rhododendrons (Rhododendron ferrugineum & R. hirsutum) and Norway spruce (GANTHALER et al. 2014). On Norway spruce, primarily the current-year needles are affected (DE BARY 1879) and turn yellow in summer, which results in defoliation (PFEIFHOFER 1989). Due to infection and an decrease in pigment content and net photosynthesis, infected trees show a diminished biomass production and growth.
Consequences are for instance cripple growth and a significant loss in timber yield. As seedlings and young trees are in particular vulnerable to defoliation, forest managers report more difficulties in natural regeneration and afforestation at high elevation sites (GANTHALER et al. 2014). Furthermore, protection towards natural hazards is put at risk, as protective forest-sites are affected in many cases. Major factors favoring the progressive distribution of Chrysomyxa-infections may be related to growing populations of rhododendron and changing climatic conditions (GANTHALER et al. 2014). Climatic-aspects of particular intrest are periods of severe drought-stress.

In the course of my diploma-thesis I try to examine the consequences of severe drought-stress and nutrient supply on the susceptibility of Norway spruce-seedlings towards Chrysomyxa rhododendri infection. For this purpose I supervised an infection experiment, quantify the infection degree via image analysis and prepare needle samples for mass-spectrometry to assess concentrations of selected phenols. Owing to their potentially inhibitive role towards fungal infections (GANTHALER et al. 2017ab), measuring phenol concentrations helps to investigate relations between both abiotic and biotic stress.
To approach such an intricate topic adequately, I am very grateful for the help and structure Prof. Dr. MAYR and Dr. GANTHALER constantly provide.

Literature cited:

PFEIFHOFER H (1989) On the pigment content of Norway spruce needles infected with Chrysomyxa rhododendri, and the carotenoids oft he fungus aeciospores. European Journal of Forest Pathology 19: 363-369.

CRANE PE (2001) Morphology, taxonomy and nomenclature of the Chrysomyxa ledi complex and related rust fungi on spruce and Ericaceae in North America and Europe. Canadian Journal of Botany 79: 957-982.

GANTHALER A, BAUER H, GRUBER A, MAYR M, OBERHUBER W, MAYR S (2014) Effects oft he needle bladder rust (Chrysomyxa rhododendri) on Norway spruce: implications for subalpine forests. European Journal of Forest Research 133:201-211.

ZOTTELE F, SALVADORI C, CORRADINI S, ANDREIS D, WOLYNSKI A, MARESI G (2014) Chrysomyxa rhododendri in Trentino: a first analysis of monitoring data. Baltic Forestry 20:28-36.

GANTHALER A, STÖGGL W, KRANNER I, MAYR S (2017a) Foliar phenolic compounds in Norway spruce with varying susceptibility to Chrysomyxa rhododendri: analyses of seasonal and infection-induced accumulation patterns. Frontiers in Plant Science 8:1173.

GANTHALER A, STÖGGL W, MAYR S, KRANNER I, SCHÜLER S, WISCHNITZKI E, SEHR EM, FLUCH S, TRUJILLO-MOYA C (2017b) Association genetics of phenolic needle compounds in Norway spruce with variable susceptibility to needle bladder rust. Plant Molecular Biology 94:229-251.

GANTHALER A, LOSSO A, MAYR S (2018) Using image analysis for quantitative assessment of needle bladder rust disease of Norway spruce. Plant Pathology 67:1122-1130.






Helmut Heinzl

Helmut Heinzl

E-Mail: Helmut.Heinzl@student.uibk.ac.at

Thesis title:
Dormancy and freezing resistance of overwintering buds of Fagus sylvatica and Alnus alnobetula.

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance

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Project description:

Following seasonal patterns, the dormancy state (endo- versus eco-dormancy) of Fagus sylvatica and Alnus alnobetula is determined parallel to the freezing resistance. This should visualize relation or independency between dormancy and freezing resistance. Through deliberate frost dehardening treatments, warm spells during the cold season are simulated. By this the dynamic and speed of frost dehardening of buds and the potential risk of frost damage in a changing climate can be assessed.





Tanja Schäfernolte

Tanja Schäfernolte

E-Mail: Tanja.Schaefernolte@student.uibk.ac.at

Thesis title:
Gefrierverhalten und Ursache von Frostschädigung von Blättern unterschiedlichen biomischen Ursprungs.

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance

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Project description:

In the frame of FWF Project P30139-B32 three vascular plant species (Ranunculus glacialis, Citrus limon, and Solanum tuberosum), that differ in their biomic origin and frost resistance, are compared with respect to their specific freezing behaviour. While for ice sensitive species any kind of ice nucleation within the tissue is lethal, ice tolerant species tolerate a freezing cytorrhysis or survive due to supercooling of the cells. With the help of cryo-microscopy and infrared thermography localization and propapagtion of ice and physiological changes during the freezing process are investigated. Studies of leaf anatomy and psychrometric measurements aim at estimating cell wall elasticity and understanding the currently scarcely understood mechanisms behind freezing resistance of cells. In addition, natural freezing patterns in leaves are documented in situ with the help of micrometeorological measurements.





Kristina Monitzer

Kristina Monitzer

E-Mail: Kristina.Monitzer@student.uibk.ac.at

Thesis title:
Translocated ice formation in buds of native woody plants

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance

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Project description:

Nearly 90 % of our native woody plants have buds that survive freezing temperatures during winter free of ice and deeply supercooled. The underlying mechanisms are hardly understood. The freezing behavior and translocated ice formation of overwintering buds of selected woody plants is investigated. The sites of ice formation in the buds, as well as deep subcooling tissues, are localized by cryomicroscopy and high-resolution infrared thermography. The results will yield an understanding of the frost survival strategies of buds of native woody species.






Melissa Sehrt

Melissa Sehrt

E-Mail: Melissa.Sehrt@student.uibk.ac.at

Thesis title:
Palynological reconstruction of the Late-Glacial to Holocene flora, vegetation and landscape changes in the Northern Lake Attersee region (Austria) and climatic variability based on the past abundance of the annual water plant Najas flexilis.

Supervisor:
Jean Nicolas Haas, RG Palynology and Archaeobotany, Innsbruck University
Univ.-Prof. Michael Strasser, RG Sedimentary Geology, Institut für Geologie, Innsbruck University

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Project description:

Palynological and plant macrofossil analyses were performed on a 538 cm long clay, lake marl, gyttja and peat stratigraphy at Gerlhamer Moor (Salzkammergut, Upper Austria) northwest of Lake Attersee allowing the reconstruction of the past regional flora, vegetation and landscape development (including fire history). Recurrent sedimentological changes revealed by rapid increases in organic matters and by distinct in chemical element distribution measured by X-ray Fluorescence (XRF) core scanning anaylses, as well as the seed remains of thermophilic water plants such as from the bushy pondweed Najas flexilis implied changing lake water levels due to regional to global climatic warming and hydrological changes. Given that Najas flexilis belongs to the extinct species in Austria and to the red list species in Europe this study highlights the ecological parameters necessary for its growth during the Holocene and before local extinction, which in turn may be of high relevance to nature protection issues and possible intentional planting of this water plant in the future.






Alumni since 2006

The following alumni have completed their Master- or Diploma thesis at the Department of Botany:

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Vanessa Gamper

Vanessa Gamper

E-Mail: Vanessa.Gamper@student.uibk.ac.at

Thesis title:
Einfluss von Klimafaktoren auf das Wachstum von Koniferen im Schnalstal

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University

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Project description:

Im Rahmen der Diplomarbeit soll die baumartenspezifische Wachstumsreaktion auf Klimafaktoren sowie Klimaextreme durch Anwendung dendroökologischer Methoden untersucht werden.
Das wesentliche Ziel ist es, artenspezifische Beziehungen zwischen Wachstum und Klima zu erheben. Außerdem soll eine vereinfachte Methode zur Umsetzung in der Schule aufgezeigt werden.






Gerold Krischker

Gerold Krischker

E-Mail: Gerold.Krischker@student.uibk.ac.at

Thesis title:
Structure of xylem parenchyma cells from sapwood with different frost resistance mechanisms

Supervisors:
Gilbert Neuner, RG Stress Physiology and Climate Resistance
Johanna Wagner, RG Reproductive Biology

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Project description:

Xylem parenchyma cells (XPCs) are the only living cells within the sapwood of woody plants. Two frost resistance mechanisms have been detected in a total number of 48 plant species tested in two previous diploma thesis (Kirchler 2016, Thialer 2017). XPCs could be shown to either survive by supercooling (69%) or tentatively freeze dehydration (extracellular freezing) (31%). Supercooling can protect XPCs only down to approximately -40°C (in extreme -50°C), whereas freeze dehydration renders XPCs frost resistant down to much lower freezing temperatures.
The current diploma study aims at a quantification of cytological and anatomical characteristic of XPCs (ray architecture, cell size, cell wall thickness and structure, pith architecture), in selected tree species, either surviving by deep supercooling or non-supercooling. This should finally yield structural prerequisites for deep supercooling XPCs.





Moritz Falch

Moritz Falch

E-Mail: Moritz.Falch@student.uibk.ac.at

Thesis title:
Diversification and evolution of Euphorbia myrsinites (Euphorbiaceae) and its didactic application.

Supervisor:
Božo Frajman, RG Evolutionary Systematics, Innsbruck University

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Project description:

Euphorbia (Euphorbiaceae) is with over 2150 species one of the largest genera of flowering plants distributed worldwide. The Mediterranean and Irano-Turanian regions are diversification centers of Euphorbia subg. Esula, one of the four main evolutionary lineages consisting of 600 species. Fourteen of them belong to E. sect. Myrsiniteae, which diversified in the Pleistocene and spread over a large area ranging from Morocco and the Iberian Peninsula to Iran. One of the most widespread species is E. myrsinites distributed in the eastern Mediterranean, Asia Minor and the Pontic area. Several closely related taxa sometimes deemed conspecific with E. myrsinites have been described in the eastern part of the distribution.
The aim of my thesis is to explore diversification and phylogeographic patterns within E. myrsinites in the Eastern Mediterranean, with a special focus on amphi-Adriatic and amphi-Aegean connections. A total of 59 populations were collected and their relationships were evaluated using molecular methods (AFLP fingerprinting and DNA sequencing) as well as relative genome size estimations. With this study we aim to contribute to a better understanding of the diversification of plants in the eastern Mediterranean.






Jasmin Lindner

Jasmin Lindner

E-Mail: Jasmin.Lindner@student.uibk.ac.at

Thesis title:
Ice management and freeze-dehydration of plants

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University

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Project description:

Die Untersuchungen sind in das FWF Projekt P30139-B32 eingebunden und sollen klären, inwieweit die Zellwandelastizität eine Rolle für die Zellentwässerung beim Gewebegefrieren spielt. Dazu wird das Gefrierverhalten von Mesophyllzellen von Pflanzenarten mit kontrastierender Blattanatomie untersucht.
Blattanatomische Parameter, wie Zellgrößen, Zellwanddicken, und Interzellularenvolumen (u.a.) werden quantifiziert. Über die Druck-Volumen-Technik wird die Zellwandelastizität psychrometrisch erfasst.
Die Dynamik und das Ausmaß der Gefriercythorrhyse diverser Mesophyllzellen wird cryomikroskopisch erfasst und soll mit den strukturellen Parametern in Beziehung gesetzt werden.






Sandra Plangger

Sandra Plangger

E-Mail: Sandra.Plangger@student.uibk.ac.at

Thesis title:
Gefrierverhalten der Mesophyllzellen von Galanthus nivalis und Vinca minor (und die direkte Anwendung für den Unterricht)

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance

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Project description:

The role of cell wall elasticity in cellular freeze dehydration during extracellular freezing of mesophyll tissues is investigated in leaves of two species with contrasting leaf anatomy: Galanthus nivalis and Vinca minor. Leaf anatomical parameters such as cell size, cell wall thickness and intercellular volume are quantified. By pressure volume analysis the cell wall elasticity is psychrometrically assessed. The dynamic and extent of freezing cytorrhysis of mesophyll cells is cryo-microscopically determined and will be related to the structural leaf parameters of the species. The investigations are carried out in the frame of FWF project 30139-B12.





Viktoria Thoma

Viktoria Thoma

E-Mail: Viktoria.Thoma@student.uibk.ac.at

Thesis title:
Gefrierverhalten von Mesophyllzellen bei Leucojum vernum und Hedera Helix.

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance

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Coming soon.






Jenni-Marlen Sabena Pohlin

Jenni-Marlen Sabena Pohlin

E-Mail: Jenni-Marlen.Pohlin@student.uibk.ac.at

Thesis title:
Seasonal and elevation-dependent variability of summer freezing resistance of Plantago major, Pinus mugo, Rhododendron ferrugineum, Saxifraga exarata, Saxifraga paniculata, Vaccinium myrtillus, and its application for class instruction.

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance

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Project description:

Frost is an abiotic environmental factor, which restricts plant productivity and plant distribution. With increasing elevation within the alpine life zone of temperate mountains, more frequent and more severe frost events can occur. Little is known about the intra-specific variability of freezing resistance in summer, and about the frost hardening potential. From June until the end of August, the frost resistance of leaves of P. mugo, P. major, R. ferrugineum, S. exarata, S. paniculata and V. myrtillus is investigated in regular intervals in samples from sites with distinct elevational difference (600-3200m). The freezing resistance of leaves is determined by exposure to controlled simulated night frosts. Thereafter, the viability of the leaves is assessed by means of chlorophyll fluorescence measurements from which actual freezing resistance LT50 is calulated.





Barbara Reier

Barbara Reier

E-Mail: Barbara.Reier@student.uibk.ac.at

Thesis title:
Dormancy and freezing resistance of overwintering buds of Acer platanoides and Sambucus nigra.

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance

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Project description:

Dormancy status and freezing resistance of overwintering buds of Acer platanoides and Sambucus nigra are assessed on a seasonal basis. By this a potential relation or independen-cy between freezing resistance and dormancy status should become visible. By targeted freeze dehydration treatments warm spells are simulated. This should yield valuable infor-mation about the dynamic and speed of freeze dehydration and finally the potential frost damage risk in a changing climate.





Theresa Baur

Theresa Baur

E-Mail: Theresa.Baur@student.uibk.ac.at

Thesis title:
Role of reactive electrophile species in high light signalling in Chlamydomonas reinhardtii.

Supervisor:
Ilse Kranner, Plant Biochemistry and Metabolism

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Project description:

Singlet oxygen is an important signalling molecule in high light-stress signalling, as it is the reactive oxygen species (ROS) predominantly produced in chloroplasts. However, the retrograde signalling-pathway from the chloroplast to the nucleus is still topic of research, as singlet oxygen is a reactive and unstable molecule not able to cover such distances. One possible pathway is the signal transduction through reactive electrophile species (RES), which originate from oxidation and subsequent fragmentation of e. g. polyunsaturated fatty acids or β-carotene. This will be tested by first identifying RES produced under high light, applying them exogenously and measuring viability and other markers as well as a transcriptomic analysis of treatment with the most promising RES.





Lisa Silbernagl

Lisa Silbernagl

Thesis title:
Ploidy level and flower morphology, but neither vegetative characters nor habitat ecology allow for discrimination of genetically divergent, co-occurring diploid and tetraploid cytotypes of Vaccinium uliginosum s. lat. (Ericaceae) in the central Eastern Alps.

Supervisor:
Peter Schönswetter, RG Evolutionary Systematics, Innsbruck University

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Project description:

The Vaccinium uliginosum agg. is a circumpolar and holarctic polyploid complex with an intricate taxonomy. The two taxa that are native in Austria are traditionally treated as species, Vaccinium uliginosum L. and Vaccinium gaultherioides BIGELOW, which are, according to the Austrian excursion flora, not only differentiated by ploidy level but also morphologically and ecologically. A former study could show that there is a clear genetic differentiation between the ploidy levels, but many of the characters listed in the excursion flora are not useful to distinguish them at least in the Alpine area. Especially the ecological differentiation in a low land species, occurring in bogs and an alpine species occurring in dwarf shrub communities is untenable.
In fact, diploid individuals are restricted to the subalpine to alpine zone, but tetraploids occur in the lowland as well as in dwarf shrub communities and can sometimes form areas of cytotype co-occurrence. These areas provide excellent possibilities not only to clarify the morphological differentiation independent of ecological influences such as altitude, but also to study the behaviour of different cytotypes in secondary contact zones. As methods we carried out vegetation relevés, morphometric analyses, flow cytometry and genetic analyses like AFLPs and sequencing of plastid DNA.




Clemens Maylandt

Clemens Maylandt

Thesis title:
An integrative approach to disentangle the diversification of the widespread Eurasian steppe plant Astragalus onobrychis (Fabaceae)

Supervisors:
Peter Schönswetter, RG Evolutionary Systematics, Innsbruck University
Eliška Záveská, RG Evolutionary Systematics, Innsbruck University

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Project description:

Astragalus onobrychis (Fabaceae) ist eine in Eurasien relativ häufig anzutreffende Steppenart. Die Verbreitung erstreckt sich von den französischen Alpen bis zum Altaigebirge in Sibirien. In diesem ausgedehnten Verbreitungsgebiet besiedelt A. onobrychis eine Fülle von ökologischen Nischen. Die Lebensräume erstecken sich von den extrazonalen Trockenrasen der Alpen, des Apennins, des Pannonikums, der Karpaten, der südlichen Balkanhalbinsel und Teilen der Schwarzmeerküste bis hin zu den flächenmäßig weiträumigen, zusammenhängenden zonalen pontischen Steppen. In der Literatur wurden drei Zytotypen (diploid, tetraploid, oktoploid) und zahlreiche intraspezifische Taxa beschrieben.

Neben der innerartlichen Variabilität und den daraus entstehenden Verwandtschaftsverhältnissen, interessierte uns die evolutionäre Geschichte von A. onobrychis, denn über raumzeitliche Dynamiken von Steppenarten ist bis heute vergleichsweise wenig bekannt. Diese Masterarbeit war in einem umfassenden vom FWF geförderten Projekt eingebunden, wo erstmals unterschiedliche Steppenbewohner (Pflanzen & Tiere) mittels moderner biogeographischer Methoden untersucht wurden.

Die Ergebnisse von molekularen (RAD Sequenzierung, Sanger Sequenzierung), zytologischen (Chromosomen-zählen, Flow-Cytometry) und morphologischen Untersuchungen zeichneten für A. onobrychis folgendes Bild:

  • Innerhalb der „Art“ A. onobrychis besteht eine erstaunliche genetische, zytologische und morphologische Vielfalt.
  • Die geographische Verbreitung korreliert mit den gefundenen Genotypen, Zytotypen und Morphotypen.
  • Die Vielfalt ist in den extrazonalen, fragmentierten Arealen (Pannonikum, Balkanhalbinsel, Apennin, Alpen) höher als in den zonalen Bereichen (Pontische Steppen).
  • Die europäischen und pontischen A. onobrychis Populationen stammen von kaukasischen Vorfahren ab
  • Hybridisierung und Polyploidisierung spielten eine bedeutende Rolle in der Evolution von A. onobrychis.
  • Wiederkehrende Perioden von Isolation und (sekundärem) Kontakt aufgrund von Klimaschwankungen während des Pleistozäns hatten einen starken Einfluss auf die Diversifikation von A. onobrychis.




Julia Hartmann

Julia Hartmann

Thesis title:
The Euphrasia minima group revisited: Is Euphrasia inopinata indeed endemic to the uppermost Ötztal?

Supervisor:
Peter Schönswetter, RG Evolutionary Systematics, Innsbruck University

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Project description:

Endemische Arten und ihre Verbreitung/ sind von besonderem Interesse für den Naturschutz und ihre Erforschung sollte uns vor allem im Hinblick auf den anthropogen verursachten Artenverlust ein Bedürfnis sein.
In meiner Masterarbeit überprüfte den Endemiten-Status von Euphrasia inopinata, einem in den Ötztaler Alpen heimischen Halbparasiten. Euphrasia (Augentrost) ist eine bestimmungstechnisch schwierige Gattung, welche in Europa durch annuelle Arten vertreten ist. Neben den großblütigen Tal-Arten gibt es eine Gruppe von kleinblütigen alpinen Vertretern, die ich im Zuge dieser Arbeit genauer untersucht habe.
Dafür wurde eine mögliche Migrationsroute von den eiszeitlichen Refugial-Bereichen westlich des Gardasees bis in die Ötztaler Alpen abgesucht. Die 72 gesammelten Populationen kleinblütiger Euphrasia wurden mittels Durchflusszytometrie, Morphometrie und Sequenzierung einer Chloroplasten-Sequenz untersucht und ergaben neben der Bestätigung des Endemiten-Status von E. inopinata, die Entdeckung eines unbekannten diploiden Augentrostes. Sie zeigte außerdem das Auftreten von Zwergformen von Tallagen-Arten im alpinen Raum auf und verdeutlichte das Verwechslungspotential dieser Zwergformen mit der häufigen tetraploiden Euphrasia minima.




Lena Nicklas

Lena Nicklas

Thesis title:
Alpenschwemmlinge am Tiroler Lech: Diversität und Verbreitung

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Andreas Bär

Andreas Bär

Thesis title:
Waldbrand: Hitzeeffekte auf Knospen und Xylem von Fichte, Föhre und Buche

Supervisors:
Barbara Beikircher, RG Ecophysiology, Innsbruck University
Stefan Mayr, RG Ecophysiology, Innsbruck University

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Project description:

Within alpine regions dry periods in spring after snow-poor winters favour the occurrence of forest fires. Therefore, the heat resistance of buds plays an important role for the survival of trees. During a forest fire, trees can be killed immediately, whereas, at lower fire intensities, trees may survive. Surviving trees often show an increased mortality rate in the following years. It is generally assumed that heat-caused cambium necrosis in the bole acts as the major post-fire mortality mechanism, but also more indirect processes, like an altered hydraulic system, can play an important role. The aim of the present study was to analyse the heat resistance of buds and to assess their thermal insulation capacity as well as the effects of heat on the hydraulic safety and efficiency.
Analyses were conducted on branches of Norway Spruce (Picea abies L. Karst), Scots Pine (Pinus sylvestris L.) and European Beech (Fagus sylvatica L.). The heat resistance of buds was analysed via the electrolyte-leakage method in the laboratory. Via the Cavitron technique, heat effects on the vulnerability to drought-induced cavitation (P50; water potential at 50% loss of conductivity) and on the hydraulic conductivity (ks) were quantified. Therefore, branch samples were experimentally exposed to a temperature of 90°C. Cross-sections were made to obtain insights into structural damages of the xylem. Additionally, we analysed heat exposed samples from a natural forest fire site. Besides vulnerability (Cavitron method), the relative loss of conductivity and ks were measurd with the XYL’EM-apparatus. Resistivity tomography was used to examine trunks of damaged trees at the fire site.
Buds of F. sylvatica were the most heat-resistant ones in all phenological stages, whereas buds of P. abies were most vulnerable. A 50% cellular damage occured in closed buds of F. sylvatica at a temperature of 58.45 ±10.64°C, of P. abies at 51.72 ±1.31°C and of P. sylvestris at 56.62 ±1.44°C. Buds of all species showed an increased vulnerability to heat with the progress of the phenological stage. Experimental heating caused an increased vulnerability to cavitation in all three species. P. abies showed a relatively small change of P50 from -3.95 ±0.05 to -3.66 ±0.09 MPa. Heating reduced the hydraulic safety considerably in P. sylvestris (P50 -3.59 ±0.09 to -2.33 ±0.14 MPa) and F. sylvatica (P50 -2.80 ±0.08 to -2.17 ±0.08 MPa). A decrease in hydraulic conductivity was only found in heat-treated samples of F. sylvatica (ks 25.31 ±1.01 to 12.91 ± 1.83 cm2s−1MPa−1). Cross-sections showed heat induced deformations of the xylem in all three species. According to laboratory experiments, naturally heat exposed samples (collected at the forest fire site) showed increased vulnerability to drought-induced embolism in P. sylvestris and F. sylvatica. Samples of P. abies, which survived the fire, did not exhibit an increased vulnerability to cavitation. Again, a reduced hydraulic conductivity was only found for F. sylvatica. Resistivity tomograms showed a clear effect of fire on the xylem of stems of P. abies, while externally damaged stems of P. sylvestris and F. sylvatica exhibited no impairments of the xylem.
Results indicate that the phenological bud-stage can be essential for the survival of trees. This holds true, especially for P. abies, which seems to be the most vulnerable species and for which the time of a forest fire, thus is to be considered critical. Surviving trees can show species-specific impairments of the hydraulic system after a forest fire. Heat causes structural deformations of the xylem and, in consequence, alters hydraulic vulnerability and efficiency. A weakened hydraulic system can impair tree vitality during future drought periods and thus cause increased mortality rates in the years after forest fires. Due to global warming, dry periods will occur with increasing frequency also in alpine regions and cause enhanced risks of forest fires. A better understandig of heat resistance and fire damages of trees thus is of great importance.




Matthias Stegner

Matthias Stegner

Thesis title:
Gefrierpsychrometrie - Bestimmung von Frostschädigung und Eisbildung pflanzlicher Gewebe

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Sophie Edlmair

Thesis title:
Archäobotanische Untersuchungen verkohlter Pflanzenreste aus einem bronzezeitlichen Brandopferplatz im Finailtal (Vinschgau)

Supervisor:
Klaus Oeggl, RG Palynology and Archaeobotany, Innsbruck University

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Project description:

Charcoal analysis has been known in Archeology since the middle of the 20th century and has been employed to study former ecosystems, changes in vegetation as well as human activities and cultural development. These are also the areas of interest concerning research on anthraco-archeological remains from bronze-aged, sacrificial sites in the Finailtal in an altitude of 2460 meters (46°45'22.12"N, 10°49'8.35"E), situated in the Schnalstal in Upper Adige (autonomous region of South Tyrol). With the site of discovery of the Iceman nearby, these anthracological analyses gain additional importance in a regional historical and archeological context. A main goal of the study was the identification of macro remains of carbonized crops to answer the question of what was sacrificed at the offering site. Secondly, we analyzed the charred wood remains to derive the composition of the burned species and answer the question of how the sacrifice was burned. Third, we tried to shed light on the surrounding vegetation, including the tree line, during the centuries the offering site was actively used.




Kathrin Blaas

Thesis title:
Desiccation of streptophyte green algae: cell physiological experiments with focus on the F-actin cytoskeleton

Supervisors:
Andreas Holzinger, RG Plant Cell Biology, Innsbruck University
Ilse Kranner, RG Plant Biochemistry and Metabolism, Innsbruck University



Natalie Ismaiel

Thesis title:
Biodiversität benthischer Diatomeen im Oberlauf der Wolga

Supervisor:
Andreas Holzinger, RG Plant Cell Biology, Innsbruck University
Martin Schletterer, Tiroler Wasserkraft AG, Innsbruck, Österreich



Marilena Gemassmer

Thesis title:
Einfluss von Düngung auf die Hydraulik von Apfelbäumen

Supervisor:
Stefan Mayr, RG Ecophysiology, Innsbruck University



Julia Ingruber

Thesis title:
Knospenmorphologie und Frostresistenzmechanismus von Knospenprimordien ausgewählter Holzarten

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Katharina Marx

Thesis title:
Untersuchungen zur Holzanatomie und Hydraulik heimischer Straucharten unter besonderer Berücksichtigung von Hedera helix

Supervisors:
Barbara Beikircher, RG Ecophysiology, Innsbruck University
Stefan Mayr, RG Ecophysiology, Innsbruck University



Marian Oberhammer

Thesis title:
Unterkühlbarkeit von Knospenprimordien der Fichte in Bezug auf molekulare Verteilungsmuster gemessen mit NIR-Spektroskopie und eine fachdidaktische Aufarbeitung

Supervisor:
Christian Huck, Institut für Analytische Chemie, Innsbruck University
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University

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Project description:
Die Unterkühlbarkeit von Knospenprimordien der Fichte, insbesondere die saisonale Änderung der Unterkühlbarkeit des Primordiums wurde im Bezug zum molekularen Verteilungsmuster in den verschiedenen Geweben der Überwinterungsknospe untersucht. Hierbei wurde der Spätsommerszustand der Knospenprimordien mit dem Winterzustand verglichen. Bei den Untersuchungen wurden verschiedenste stressphysiologische und chemische Messmethoden eingesetzt. Durch kontrollierte Frostbehandlung der Knospen und nachfolgender Vitalfärbung der Primordien mit TTC konnte die Frosthärte (LT50) ermittelt werden. Dabei sank der LT50 -wert von anfänglich -14,4°C im Spätsommer auf -23,7°C im Hochwinter ab. Parallel zur Untersuchung mittels Differentieller Thermoanalyse (DTA), über welche die letale Ausfriertemperatur der Knospenprimordien (LTESommer: -12,8°C, LTEWinter: -24,8°C) bestimmt werden kann, wurden Infrarotaufnahmen vom Gefriermuster der Sprossachse und der anhaftenden Knospen gemacht. Diese erlaubten eine detaillierte Detektion eisfreier Gewebe in der Knospe und zeigten vor allem, dass das Primordium beim Frieren tatsächlich eisfrei bleibt. Kurzzeitige Fröste und Temperaturen bis zu -26°C können Fichtenknospenprimordien im Hochwinter durchaus ohne Schädigung überstehen. Zudem wurde durch die psychrometrische Messung der Gesamtwasserpotenzialwert der Fichtenknospenprimordien bestimmt, über den sich der Wassergehalt bzw. Wasserversorgungszustand ermitteln lässt. Im September wurde ein Gesamtwasserpotenzial von -2,8 MPa gemessen, während im Jänner das Gesamtwasserpotenzial bei -4 MPa lag. Unterschiede in der molekularen Zusammensetzung in verschiedenen Geweben der Fichtenknospe beider saisonaler Zustände sollten mittels naher Infrarotspektroskopie detektiert werden. Vergleicht man nun die stofflichen Verteilungsmuster in den Primordien im Sommerzustand mit dem Zustand im Winter, so kann man zwar eine höhere Stabilität der Winterknospen gegen Frostereignisse feststellen, eine unterschiedliche stoffliche Zusammensetzung lässt sich nur schwer bis gar nicht festmachen.




Sara Raß

Thesis title:
Dendroökologische Untersuchung des Einflusses von Umweltfaktoren auf das Wachstum der Grauerle (Alnus incana) in den Mieminger und Rietzer Innauen sowie die Umsetzung im Unterricht

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Stephanie Schenk

Thesis title:
Maximale Hitzetoleranz ausgewählter alpiner Pflanzenarten unter künstlicher Erwärmung unter besonderer Berücksichtigung des Blattwasserpotentials

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University
Othmar Buchner, RG Stress Physiology and Climate Resistance, Innsbruck University



Florian Schiffmann

Thesis title:
Gefrierdehydrierung von Typ I und Typ II Knospenprimordien und die direkte Anwendung für den Unterricht

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Juliane Thialer

Thesis title:
Zusammenhang zwischen Holzanatomie und Frosthärte des Xylems ausgewählter Holzpflanzen

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Sandra Gritscher

Thesis title:
Hitzetoleranz reproduktiver Gewebe von Wiesenpflanzen

Supervisors:
Franz Pauer, Institut für Fachdidaktik / Institut für Mathematik, Innsbruck University
Johanna Wagner, RG Reproductive Biology, Innsbruck University



Sandra Wimmer

Thesis title:
Auswirkung von Hitze auf die Pollenkeimung und das Pollenschlauchwachstum von sommerblühenden Wildpflanzen

Supervisors:
Franz Pauer, Institut für Fachdidaktik / Institut für Mathematik, Innsbruck University
Johanna Wagner, RG Reproductive Biology, Innsbruck University



Lisa Kirchler

Thesis title:
Frosthärte des Xylems und die geographische Verbreitung von mitteleuropäischen Holzpflanzen

Supervisor:
Othmar Buchner, RG Stress Physiology and Climate Resistance, Innsbruck University
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University
Peter Schönswetter, RG Evolutionary Systematics, Innsbruck University



Sabrina Koch

Thesis title:
Modulationsgeschwindigkeit der Frosthärte von Knospenmeristemen der Fichte und die direkte Anwendung für den Unterricht

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Dominik Kaplenig

Thesis title:
Frosthärte von Knospenprimordien und die geographische Verbreitung von Baumarten und die direkte Anwendung für den Unterricht

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Anna Hölzl

Thesis title:
Klima-Wachstum-Beziehung von Nadelgehölzen im Waldgrenzökoton Kaserstattalm (Stubaital, Tirol)

Supervisor:
Thorsten Schwerte, Institut für Zoologie, Innsbruck University
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Martin Lagger

Thesis title:
Dendroökologische Analysen der Laubwaldrelikte im Gößgraben: (Nationalpark Hohe Tauern)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Mario Pecoraro

Thesis title:
Vergleichende dendroklimatologische Untersuchung von Pinus sylvestris, Picea abies und Larix decidua an einem inneralpinen Trockenstandort und die fachdidaktische und unterrichtspraktische Ausarbeitung von Unterrichtseinheiten zum Thema Baumwachstum

Supervisors:
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Gina Ira Lethaus

Thesis title:
Auswirkung von Trockenstress und der Stammringelung auf die Kohlenhydrat Akkumulation in ober- und unterirdischen Organen bei der Fichte (Picea abies (L.) Karst.), sowie die Umsetzung im Unterricht

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Evelyn Gastl

Thesis title:
Auswirkung von Kälte auf das Pollenschlauchwachstum von sommerblühenden Wildpflanzen

Supervisor:
Johanna Wagner, RG Reproductive Biology, Innsbruck University



Martin Kogler

Thesis title:
Kältetoleranz der Blütenfunktionen bei der Schneerose (Helleborus niger L.)

Supervisor:
Johanna Wagner, RG Reproductive Biology, Innsbruck University



Franziska Moser

Thesis title:
Fortpflanzungssysteme bei Gebirgspflanzen

Supervisors:
Johanna Wagner, RG Reproductive Biology, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Michaela Maria Scheiber

Thesis title:
Die Pollenfunktionen von Frühjahrsblühern in der Kälte

Supervisor:
Johanna Wagner, RG Reproductive Biology, Innsbruck University



Matthias Karadar

Thesis title:
Maximale Hitzetoleranz von Pflanzen des alpinen Lebensraumes: physiologische und ultrastrukturelle Aspekte

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University
Othmar Buchner, RG Stress Physiology and Climate Resistance, Innsbruck University



Andrea Danler

Thesis title:
Besiedlungsmuster dreier Gletschervorfelder in den Ötztaler Alpen

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University

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Project description:

Primary succession in glacier forelands acted worldwide and multiple as research topic. The glacier retreat in the Ötztal Alps has been observed and well documented since a long time. The aim of my thesis was to investigate primary succession of three glacier forelands. The investigation has focused on the development along the chronosequence rather than on the recording of all occurring communities. Disturbed areas have not been studied. Two glacier forelands with similar bedrock (calcareous and siliceous rocks intermingled) were compared to one on siliceous bedrock.
Three adjacent glacier forelands in the Ötztal Alps with similar size and extent were selected: Gaisbergtal, Rotmoostal and Langtal. In each of the valleys 100 relevés (3x3 m) were performed along the chronosequences. In addition, parameters such as altitude [m above sea level] inclination [gon], maximum height [cm], average height [cm], total coverage [%], coverage of herbaceous plants, coverage of mosses and lichens [%] and the soil pH were determined. The period since deglacistion was identified by means of GPS data and glacier retreat maps. Data were analyzed by means of TWINSPAN-classification. The clarification of the correlation between site factors and plant species or associations was conducted with ordinations (multivariate statistics).
On the investigated glacier forelands different successional stages were distinguished: pioneer stages, early successional stages and initial grasslands. The pioneer stage at Rotmoostal and Gaisbergtal can be divided in a species-poor and a species-rich one. At Rotmoostal and Langtal the initial grasslands from the orographic left and right sides of the valley were remarkably different. A syntaxonomic assignment to species associations was not possible. The different successional stages arranged along the time gradient.
The successional stages in Gaisberg- and Rotmoostal differ significantly from those at Langtal ragarding species composition and abundance. This can be explained by the different geology. While Gaisberg- and Rotmoostal are both influenced by the Schneeberg-complex and the Ötztal–Stubai-complex, resulting in a mixture of limstone and silicate in the two valleys, the Langtal is determined only by the Ötztal-Stubai complex, which is composed of silicates and leads to acidic soil formation.




Senta Stix

Thesis title:
Mooranalysen im inneren Ötztal

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Monika Helene Hamacher

Thesis title:
Sonic and electrical resistivity tomography on tree stems: species-specific patterns, the influence of ion and water content, and use for damage assessment after forest fires

Supervisors:
Barbara Beikircher, RG Ecophysiology, Innsbruck University
Stefan Mayr, RG Ecophysiology, Innsbruck University



Yvonne Markl

Thesis title:
Koniferentüpfel: Anatomische und funktionelle Untersuchungen an Fichte (Picea abies) und Zirbe (Pinus cembra)

Supervisor:
Stefan Mayr, RG Ecophysiology, Innsbruck University

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Project description:

Coniferous tracheids are connected by numerous cell wall openings, the bordered pits. Their porous membrane (margo) facilitates water flow through the xylem, while pit clo-sure occurs by sealing of the aperture (porus) by a central thickening (torus) when pres-sure differences increase. The ratio between torus and porus (overlap) thus in¬flu¬ences re-sis¬tance against air entry (embolism), induced by drought stress or repeated freeze-thaw events. At the alpine timberline, these stress factors occur with high inten¬sity. The aim of this study was to investigate altitude de¬¬pendent differences of xylem structure and pit ar-chi¬tecture as well as the uptake of water over the surface of twigs and its distribution with¬in a tree (embolism repair).
Stem cores of Norway spruce (Picea abies) and Stone pine (Pinus cembra) were taken a-long an alti¬tudinal transect (1.500 – 2.100 m a.s.l.). Xylem dimensions and pit pro¬perties were measured under both, light and electron microscope. For a refilling ex¬periment, plas¬tic bags with Deuterium labeled water were mounted during early spring on Picea abies and changes of water potential and conductivity were monitored.
The anatomical measurements showed relatively constant xylem structures along the tran¬sect. Stone pine exhibited slightly larger pit (17 – 21 µm) and torus diameters (8,8 – 11,4 µm) than Norway spruce (16 – 20 µm; 8,2 – 10,1 µm, respectively), as well as a big-ger over¬lap. In both species the overlap in relation to the torus size (O_rel1) decreased, while the overlap in relation to the pit mem¬brane (O_rel2) increased with increasing ele-va¬tion. In the refilling experiment water potentials increased from -3,4 MPa to -0,05 MPa and conductivity recovered by 20 – 50 %.
The pit architecture was hardly influenced by elevation, which indicates that pit formation was not limited despite higher stress intensities at the timberline or that pit dimensions are hydraulically important and therefore kept constant. However, observed minor chan-ges in overlap might cause a slightly more instable aspiration of the torus or a slightly higher rigidity of the margo in trees at higher elevation. The refilling experiment showed that conifers at the alpine timberline can take up water via the branch surface and distri¬bute this water within the crown to increase water potentials and repair embolism. Pits there¬by are probably important to isolate embolised from intact xylem sections. The pre¬sent study enabled new insights into the structure and function of conifer pits, which play a central role in both embolism resistance and embolism repair.




Ines Aster

Thesis title:
Einfluss von Umweltfaktoren auf das Wachstum eines Grauerlenauwaldes (Alnetum incanae) im Sonderschutzgebiet Mieminger und Rietzer Innauen (Tirol)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Andrea Winkler

Thesis title:
Einfluss von Trockenstress und Stammringelung auf das Radialwachstum der Fichte (Picea abies (L.) Karst.)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Marlies Außerlechner

Thesis title:
Paläoethnobotanische Analysen zu offenen Fundkomplexen der neolithischen Siedlung in Barbian (Südtirol)

Supervisor:
Klaus Oeggl, RG Palynology and Archaeobotany, Innsbruck University



Petra Heidenwolf

Thesis title:
Die Kausalität zwischen der Pollenfracht in der Luft und dem Pollenniederschlag auf der Erdoberfläche in der subalpinen Stufe

Supervisor:
Klaus Oeggl, RG Palynology and Archaeobotany, Innsbruck University



Stefanie Maria Laiminger

Thesis title:
Quantitative Analysen der Ingesta aus dem Magen der neolithischen Gletscherleiche "Ötzi"

Supervisor:
Klaus Oeggl, RG Palynology and Archaeobotany, Innsbruck University



Susanne Grass

Thesis title:
Buddleja davidii in Nordtirol

Supervisor:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University



Valentina Heiss

Thesis title:
Monitoring über die Entwicklung der Neophyten-Situation auf Großbaustellen: weiterführende Untersuchungen der Deponien Ahrental, Ampass Süd und Padastertal, sowie Erstaufnahme der Deponie Ampass Nord

Supervisor:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University



Daniela Vill

Thesis title:
Verbreitung ausgewählter invasiver Pflanzenarten in Marokko

Supervisor:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University



Maximilian Epstein

Thesis title:
Habitat characteristics, population structure and conservational issues of Anthyllis vulneraria in Luxembourg

Supervisor:
Guy Colling, Nationales Museum für Naturgeschichte, Luxemburg
Peter Schönswetter, RG Evolutionary Systematics, Innsbruck University



Julian Wimmer

Thesis title:
Metabolic changes during seed germination and early seedling development in two Brassica oleracea genotypes with contrasting seed vigour

Supervisors:
Ilse Kranner, RG Plant Biochemistry and Metabolism, Innsbruck University
Wolfgang Stöggl, RG Plant Biochemistry and Metabolism, Innsbruck University



Thomas Sansone

Thesis title:
Keimungsdynamik von Heliosperma pusillum und Heliosperma veselskyi

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Daniel Reidl

Thesis title:
Ackerbau im Paznaun und in der Silvretta-Region (Österreich/Schweiz): Segetalflora, Kulturtechnik, Geschichte - Dokumentation einer im Verschwinden begriffenen Landwirtschaftstradition

Supervisor:
Jean Nicolas Haas, RG Palynology and Archaeobotany, Innsbruck University



Attila Karoly

Thesis title:
Analyse der Dynamik hydraulischer Parameter während der Austrocknung bei Klebsormidium crenulatum und Zygnema sp.

Supervisor:
Andreas Holzinger, RG Plant Cell Biology, Innsbruck University
Stefan Mayr, RG Ecophysiology, Innsbruck University

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Project description:

This master thesis reports changes of hydraulic parameters in two representatives of streptophytic, terrestrial green algae (Klebsormidium crenulatum SAG 2415 and Zygnema sp. ‚Saalach‘ SAG 2419) during desiccation at different relative air humidity values. In order to carry out the investigations at various values of constant relative air humidity, a test chamber was constructed for these measurements. The desiccated algal filaments were viewed with an inverted microscope, which allowed to record images of the cells during the desiccation process. Using these images the protoplasts of the filaments were analysed for changes in shape due to desiccation and measured by means of an image analysis program. This experimental setup allowed to capture different hydraulic parameters and to investigate their changes when compared to the initial situation before desiccation. These investigations delivered the following results: When exposed to decreasing values of relative air humidity, during desiccation, the protoplasts of Zygnema sp. exhibited more severe changes concerning both shape and dimension than the protoplasts of K. crenulatum; For Zygnema sp. the values for the relative reduction of the protoplast volume increased from 34.2 ± 10.9 % at the highest relative air humidity (95.8 %) to 83.9 ± 8.9 % at the lowest relative air humidity (4.2 %), whereas in case of K. crenulatum these values ranged between 46.4 ± 8.3 % at the highest relative air humidity (95.4 %) and 75.9 ± 11.6 % at the lowest relative air humidity (3.7 %); Converting the values of the relative air humidity into water potentials and the relative reductions of protoplast volumes into water saturation deficits (WSD), pressure-volume curves (PV curves) were created for both test organisms. Although the transition point to the asymptotic part of the curves was almost at the same WSD-value for both organisms (approximately 82.6 % WSD), the asymptotic WSD-values for Zygnema sp. were lower than for K. crenulatum.
The last chapter of this master thesis deals with potential sources of error and gives recommendations on how these could be avoided in future experiments.




Christina Schausberger

Thesis title:
Effects of accelerated ageing on the antioxidant system in Brassica oleracea seeds

Supervisors:
Ilse Kranner, RG Plant Biochemistry and Metabolism, Innsbruck University
Thomas Roach, RG Plant Biochemistry and Metabolism, Innsbruck University

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Project description:

Seeds are the basis of agriculture, providing food to humans and animals. Seed quality is a key factor for crop growth and health whereby seed storage conditions greatly impact on seed viability (ability to live and germinate) and vigour (performance during germination). Increasing oxidative damage by reactive oxygen species (ROS) contributes to the ageing process. Water-soluble antioxidants, such as glutathione (GSH), and lipid-soluble antioxidants, such as tocochromanols scavenge ROS, and redox control is key to seed longevity. Differences in the antioxidant system of B. oleracea seeds with high vigour (genotype Sl101) and low vigour (genotype A12) were examined during ageing at 40°C and 75% relative humidity at ambient (18-21%) or high (78%) O2 concentrations.
High seed viability was maintained [92% to 100% total germination (TG)] during the first 19 days of ageing, and subsequently declined to 1% TG after 56 d. Interestingly, ageing under high O2 decreased the vigour of both genotypes without decreasing total germination. Early in ageing GSH was oxidised to glutathione disulphide (GSSG), indicating that ROS were scavenged by GSH. As a marker of the cellular redox state, the half-cell reduction potential of the GSSG/2GSH redox couple (EGSSG/2GSH), calculated using the Nernst equation, rapidly shifted to less negative values (i.e., more oxidising) during the first 19 days of ageing before viability was lost. Therefore, in B. oleracea the EGSSG/2GSH is an early stress marker before viability loss under the chosen conditions. The shift in the cellular redox balance was accompanied by a steady decrease in activity of glutathione reductase (GR), however, the activity of glucose-6-phosphate dehydrogenase, glutathione peroxidase and lipoxygenase showed less dramatic changes. In seeds of both vigour genotypes the -tocopherol content, the second most abundant tocochromanol, decreased during ageing, whereas -tocopherol and -tocotrienol slightly increased, and total tocochromanol content remained stable. Only ageing under high O2 led to a decline in -tocotrienol, as observed in both genotypes. The fatty acid composition showed no variation in response to ageing, but C16:1, C18:1, C18:2, C22:0, C22:1, C22:2 contents significantly differed between the two genotypes. In conclusion, the results show that ageing of B. oleracea seeds is associated with changes in the antioxidant defence system. Neither enzyme activity nor non-enzymatic antioxidants (glutathione, tocochromanols) or longevity differed between vigour types. Ageing under high O2 affected seeds of B. oleracea less negatively than expected, which warrants further investigation.




Julia Sailer

Thesis title:
Elektrische Widerstandstomographie: Analyse der Auswirkungen von Austrocknung, Temperatur, Rinde und Nagelinstallation sowie Freilanduntersuchungen an Zirben der alpinen Waldgrenze

Supervisor:
Stefan Mayr, RG Ecophysiology, Innsbruck University

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Project description:

Electrical Resistivity Tomography (ERT) allows an almost nondestructive analysis of the resistivity distribution within the wood of trees. The electrical resistivity depends on wood moisture, electrolyte concentration and cell structure and allows conclusions regarding the vitality of tree stems and the water content in wood. In this master thesis, factors influencing ERT were analyzed to further improve the understanding of the ERT-methodology.
The analyses were performed on three deciduous trees (Betula pendula, Fagus sylvatica, Populus nigra) and three conifers (Larix decidua, Picea abies, Pinus cembra). The influence of dehydration and temperature on ERT was determined in the laboratory using stem samples. Additionally, the impact of removing the bark and using different periods of nail installations, to which the electrodes were connected, were examined. In a field study, the annul course and altitude dependent changes along an elevational transect were analyzed on P. cembra. These analyses were compared with measurements taken on stem cores of the respective trees.
Based on the resulting tomographies, patterns of the electrical resistivity within the stem cross section, the average resistivity Rmean and resistivity changes along the radius were analyzed. With progressing dehydration, the resistivity in the stem intersection increased in all species (except B. pendula), with P. abies showing the greatest variation (Rmean +160% from 272±12Ωm at 0.4MPa to 706±23Ωm at -4.7MPa). Decreasing temperature also caused an increase in resistivity, especially when passing the freezing point, resulting in a raise of Rmean of up to 733% (P. abies, Rmean from 608±25Ωm at 20°C to 4455±104Ωm at -10°C). Rmean of F. sylvatica decreased by 16% when removing the bark (from 181Ωm to 152Ωm). Installation of measurement nails for a longer period (a few months) lead to an increased resistivity values compared to nails installed directly before ERT measurements (up to 76% difference). In P. cembra, pronounced seasonal changes in resistivity, with high values in winter and low values in spring, were observed. A minor (non-significant) decrease with increasing elevation was found. The analysis on wood cores showed a significant correlation between the hydraulic conductivity (ks) and electrical resistivity, whereby ks decreased and resistivity increased with the age of annual rings. The greatest values for ks were found in the first (5.3cm2 s-1 MPa-1) and second (4.3cm2 s-1 MPa1) annual ring.
Results provide new insights in the ERT and influencing factors. Dehydration, lower temperatures and nail installations for a long period caused higher resistivity, whereas removing the bark induced lowers values. These factors have also to be considered for the interpretation of observed seasonal changes in the resistivity of P. cembra at the timberline. As indicated by the correlation between the electrical resistivity and hydraulic conductivity in wood cores, ERT then can be used to estimate the hydraulic status of tree stems.
Studied factors are of great importance for ERT measurements and must be taken into account when measuring and interpreting results. When used accurately, ERT represents a promising method for tree diagnosis, ecophysiological studies (e.g. determining sapwood) and functional-anatomical research.




Franz Demar

Thesis title:
Einfluss von Umweltfaktoren auf Wachstum und Entwicklung einer Weichholzau im Sonderschutzgebiet Mieminger - Rietzer Innauen (Tirol)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Birgit Sailer

Thesis title:
Wachstumsanalytische Untersuchung des Haselwuchses der Fichte (Picea abies)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University

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Project description:

The so-called ‚hazelgrowth’ is an anomalous form of tree ring growth in Spruce (Picea abies (L.) Karst) and other tree species characterized by indented rings. The factors inducing ‘hazelgrowth’ are not known. Cambial activity is reduced temporarily. This master thesis deals with the question which climatic factors (precipitation, temperature) are limiting tree ring width of individuals showing hazelwood. Moreover the influence of extreme weather conditions (heat, cold, frost) and mechanical stress such as wind was examined with regard to the possible causes of inducing hazelwood. Additionally, microscopical examinations were conducted, to find out whether there is an abnormal wood anatomy on the spots where hazelwood occurs. 25 wood discs from the area of Piller Sattel and Landeck (Tirol, Austria) from 1380 to 1620 m a. s. l. were used in this study. The following methods were applied to answer dendroecological questions: development of ring width chronologies, analysis of climate-growth relationships, synchronization with local Spruce-chronologies and calculation of extreme growth years. The distribution, the beginning year and the length of the indentations were examined in their horizontal and vertical course and related to geographical directions. Scanning electron microscopic analysis of hazelwood was also applied. No significant influence of climate (precipitation, temperature) on radial growth apart from July-temperature of the previous year (r = – 0,325; P < 0,001) was found. The fact that climatic factors are not limiting the growth of ‘hazelgrowth’ Spruce trees was also supported by a low sensitivity of < 16% and high correspondence with other Spruce-chronologies of the same area without indentations. ‘Hazelgrowth’ starting years and climate extremes showed no significant relationship. On the other hand, it was found out that the distribution of indentations on the tree discs mainly occurs on the South-East quadrant, which leads to the assumption that unilateral mechanical stress (wind) plays a major role in inducing hazelwood. This is also confirmed by vertical distribution of hazelwood. Indentations are more and longer (up to 121 years) in the lowest part of the tree stem and number and length diminishes with increasing tree height. Moreover indentations have been never found in the innermost part, but starting only years later when a certain stem height is reached and wind exposure would become a relevant factor. Microscopic analyses have shown the frequent occurrence of traumatic resin ducts quite before and/or within ‘hazelgrowth’, which also indicates mechanical stress such as tension, compression and shear forces on the cambium (the wood producing cells). Wood anatomy (untypically enlarged and irregular tracheids, distorted ray parenchyma cells) in and around the indentations is disturbed. Further experiments could show if wind actually is the cause of hazelwood and molecular biological analyses could help to find out the proportion of genetic components involved in inducing hazelwood.




Angelika Wieland

Thesis title:
Klimasensitivität, Wachstumsverlauf und Kambiumaktivität absterbender Rotföhren ("Pinus sylvestris" L.)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Petra Schattanek

Thesis title:
Effects of drought stress on xylem function and stomata regulation of Austrian forest tree species

Supervisors:
Barbara Beikircher, RG Ecophysiology, Innsbruck University
Stefan Mayr, RG Ecophysiology, Innsbruck University



Isabella Storm

Thesis title:
The pollen load from flower visitors and it's [its] relation to the host plants in the gardens of Schloss Trauttmansdorff in Meran (South-Tyrol)

Supervisor:
Erwin Meyer, RG Bodenökologie, Innsbruck University
Klaus Oeggl, RG Palynology and Archaeobotany, Innsbruck University
Timotheus Kopf



Angelika Ritzer

Thesis title:
Einfluss der Fettwiesen auf die Vegetation der Schwemm & Ausarbeitung eines Unterrichtsprojekts zum Thema "Schütze die Schwemm!"

Supervisors:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Joseph Molyneux

Thesis title:
Die Hirschlacke bei Mutters: ein Tiroler Naturdenkmal aus botanischer und fachdidaktischer Sicht

Supervisors:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Michael Geßlbauer

Thesis title:
Gefrierverhalten von Pflanzen und die direkte Anwendung für den Unterricht

Supervisors:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Stefan Menghin

Thesis title:
Ernährung im Wandel der Zeit: der Paläodiät auf der Spur

Supervisor:
Klaus Oeggl, RG Palynology and Archaeobotany, Innsbruck University



Tim Moser

Thesis title:
The occurrence of chloroplast protrusions in Mesophyll cells of Ranunculus glacialis as a response to variable climate conditions

Supervisor:
Andreas Holzinger, RG Plant Cell Biology, Innsbruck University
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University
Othmar Buchner, RG Stress Physiology and Climate Resistance, Innsbruck University



Theresa Rosa Walder

Thesis title:
Effekte von Temperatur und Trockenstress auf Keimung subalpiner und alpiner Arten

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Thilo Alexander Kappelmeyer

Thesis title:
7500 Jahre lokale und regionale Floren- und Vegetationsentwicklung im Umkreis des Unteren Butterwiesenmoores (Fimbertal, Kanton Graubünden, Schweiz) im archäologischen und paläoklimatologischen Kontext

Supervisor:
Jean Nicolas Haas, RG Palynology and Archaeobotany, Innsbruck University



Klaus Herburger

Thesis title:
Zellwandkomponenten und ökophysiologische Charakterisierung der streptophytischen Grünalgen Klebsormidium sp. und Zygnema sp.

Supervisor:
Andreas Holzinger, RG Plant Cell Biology, Innsbruck University



Artur Oelhaf

Thesis title:
Neophytenmonitoring auf Großbaustellen: am Beispiel der Deponien Ahrental, Padastertal und Wolf

Supervisor:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University



Marianne Magauer

Thesis title:
Alyssum "Hochschwab", a new locally endemic species from the eastern alps

Supervisor:
Božo Frajman, RG Evolutionary Systematics, Innsbruck University
Peter Schönswetter, RG Evolutionary Systematics, Innsbruck University



Martin Lechleitner

Thesis title:
Bestäubungsökologie von Gebirgspflanzen entlang eines Höhengradienten in den Tiroler Alpen

Supervisors:
Johanna Wagner, RG Reproductive Biology, Innsbruck University
Irene Schatz, Institut für Ökologie, Innsbruck University



Magdalena Stoll

Thesis title:
Nachwirkungen von Hitzestress auf die Photosynthese von Pflanzen des alpinen Lebensraumes: und Entwicklung eines Unterrichtskonzeptes zum forschenden Lernen mit dem Thema Umwelteinflüsse auf die Photosynthese

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University
Othmar Buchner, RG Stress Physiology and Climate Resistance, Innsbruck University



Michael Grünebach

Thesis title:
Verbreitung und Abgrenzung zweier nahe verwandter Vaccinium-Arten in den Alpen und Gestaltung eines Unterrichtsprogramms für die Umsetzung der Pflanzensoziologie im gymnasialen Biologieunterricht

Supervisors:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Thomas Niederegger

Thesis title:
Keimungsverhalten von alpinen Grasartigen in Abhängigkeit von den Umweltfaktoren Temperatur und Trockenheit: Keimungsversuche im Labor und ihre Umsetzung im Biologieunterricht

Supervisors:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University
Hans Hofer



Julia Mennel

Thesis title:
Wie wachsen Bäume: forschendes Lernen für die Sekundarstufe 1 aufbauend auf dem Forschungsprojekt: radiale Wachstumsreaktion im Alpenraum verbreiteter Koniferen auf Trockenstress

Supervisors:
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Clara Bertel

Thesis title:
Auswirkungen mechanischer Belastungen auf die hydraulische Effizienz und Sicherheit des Xylems von Fichte (Picea abies) und Föhre (Pinus sylvestris)

Supervisor:
Stefan Mayr, RG Ecophysiology, Innsbruck University



Andrea Dablander

Thesis title:
Vergleichende cytomorphologische Untersuchungen an coccalen coenocytischen Bodenalgen (Chlorophyceae)

Supervisor:
Georg Gärtner, RG Evolutionary Systematics, Innsbruck University



Elisabeth Falkeis

Thesis title:
Neophyten Management im Naturpark Kaunergrat (Pitztal-Kaunertal): Monitoring - Strategien und Maßnahmen der Umsetzung

Supervisor:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University



Daria Konzett

Thesis title:
Lokalisation der Eisnukleation und Muster der Eisausbreitung in Überwinterungsknospen von Picea abies und Pinus cembra

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Vera Margreiter

Thesis title:
Auswirkungen von Meereshöhe & Sukzessionsstadium auf Reproduktion, Wachstum und Phänologie von Poa alpina (L.)

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Stefanie Newerkla

Thesis title:
Fortpflanzungssysteme in Hochgebirgspflanzen

Supervisors:
Johanna Wagner, RG Reproductive Biology, Innsbruck University
Ursula Ladinig, RG Reproductive Biology, Innsbruck University



Elisabeth Waldner

Thesis title:
Holozäne Pflanzendiversität mit besonderem Augenmerk auf Hydrophyten im Bereich des ehemaligen Sees Lough an Chorcail (Westirland)

Supervisor:
Jean Nicolas Haas, RG Palynology and Archaeobotany, Innsbruck University



Mario Pecoraro

Thesis title:
Vergleichende dendroklimatologische Untersuchung von Pinus sylvestris, Picea abies und Larix decidua an einem inneralpinen Trockenstandort

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Irina Anich

Thesis title:
Großrestanalytische Untersuchung des Las Gondas Moores zur holozänen Floren- und Vegetationsentwicklung im Fimbertal (Schweiz) und Möglichkeiten zur fachdidaktischen Umsetzung des Themas im AHS-Unterricht

Supervisor:
Jean Nicolas Haas, RG Palynology and Archaeobotany, Innsbruck University



Martina Kröss

Thesis title:
Einfluss von Klimafaktoren auf das Radialwachstum von Nadelholzbeständen im Wipptal und fachdidaktische Aufarbeitung der angewandten Methoden und Inhalte in Form einer Tagesexkursion

Supervisors:
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Ulrike Traugott-Priester

Thesis title:
Wie Bäume wachsen: Vorstellungen von SchülerInnen über Baumwachstum und ihre Rekonstruktion im Unterricht

Supervisors:
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Barbara Brunner

Thesis title:
Bodenalgen aus hochalpinen Lokalitäten der Liebener Rippe (Obergurgl, Tirol)

Supervisor:
Georg Gärtner, RG Evolutionary Systematics, Innsbruck University



Ines Bauer

Thesis title:
Darstellung der Proteinmuster aus Blättern der antarktischen Blütenpflanzen Deschampsia antarcica und Colobanthus quitensis im Vergleich zu alpinen Referenzpflanzen

Supervisor:
Cornelius Lütz, RG Plant Biochemistry and Metabolism, Innsbruck University



Andrea Ganthaler

Thesis title:
Untersuchung zur Hydraulik der alpinen Zwergsträucher Vaccinium myrtillus, V. vitis-idaea und V. gaultherioides

Supervisor:
Stefan Mayr, RG Ecophysiology, Innsbruck University



Ramona Miller

Thesis title:
Extrinsische versus intrinsische Eisnukleation bei Keimlingen

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Christoph Stöckl

Thesis title:
Einfluss von Trockenstress auf das Radialwachstum von Koniferen im NSG Rosengarten

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Barbara Zeisler

Thesis title:
Fichtennaturverjüngung an einem inneralpinen Trockenstandort

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Sonja Wegleiter

Thesis title:
Einfluss von Umweltfaktoren auf Wachstum und Entwicklung eines Grauerlenbestandes (Alnetum incanae) im Naturschutzgebiet Valsertal (Tirol)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Jürgen Schneider

Thesis title:
Neophytenmonitoring auf Großbaustellen am Beispiel der Deponie Ahrental Süd

Supervisor:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University



Claudia Florian

Thesis title:
Die Auswirkungen von Bodentrockenheit auf die Kohlenhydrat-Pools von Kiefern (Pinus sylvestris L.) an einem inneralpinen Trockenstandort

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Ronald Oberhofer

Thesis title:
Dendroökologische Untersuchung des Baumwachstums auf einem hochmontanen Moorstandort (Totenmoos, Ultental, Südtirol)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Peter Steiner

Thesis title:
Dendroökologische Untersuchung des Baumwachstums auf einem hochmontanen Moorstandort (Totenmoos, Ultental, Südtirol)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Sylvia Farbmacher

Thesis title:
Einfluss von Trockenstress auf oberirdische Wachstumsprozesse von Koniferen

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Elisabeth Alber

Thesis title:
Der Einfluss von Phytohormonen auf die Pflanzenentwicklung: Experimente für den Biologieunterricht

Supervisors:
Johanna Wagner, RG Reproductive Biology, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Veronika Kraler

Thesis title:
Vitalität und Funktionsdauer von Pollen in Gebirgspflanzen

Supervisor:
Johanna Wagner, RG Reproductive Biology, Innsbruck University



Barbara Lackner

Thesis title:
Mikroskopische Analyse der Gefriercytorrhyse von Mesophyllzellen von Ranunculus glacialis und Entwicklung eines forschenden Unterrichtskonzepts zum Thema Frosttoleranz bei Pflanzen

Supervisors:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Rene Graßmair

Thesis title:
Pflanzliche Besiedelung am Blockgletscher Äußeres Hochebenkar (Ötztaler Alpen/Tirol)

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Barbara Brugger

Thesis title:
Die Wiesenvegetation der Pidigalm (Gsiesertal, Südtirol)

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Franziska Kaplan

Thesis title:
Osmotischer Stress in alpinen "Klebsormidium"-Arten: physiologische und strukturelle Reaktionen als Basis für ihren ökologischen Erfolg

Supervisor:
Andreas Holzinger, RG Plant Cell Biology, Innsbruck University



Siegfried Aigner

Thesis title:
Isolierung und Charakterisierung eines UV/VIS-Schutzpigmentes aus der Eisalge Mesotaenium berggrenii (Mesotaeniaceae, Chlorophyta) und anderer Arten der Zygnematales

Supervisor:
Cornelius Lütz, RG Plant Biochemistry and Metabolism, Innsbruck University



Markus Nolf

Thesis title:
Physiological and morphological adaptations to drought stress in Solidago canadensis L.

Supervisor:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University
Stefan Mayr, RG Ecophysiology, Innsbruck University



Chiara De Cesare

Thesis title:
Analyse von hydraulischen und anatomischen Parametern zur Abschätzung der Trockenheitsresistenz bei den Apfelsorten "Golden Delicious", Braeburn" und "Red Delicious"

Supervisor:
Stefan Mayr, RG Ecophysiology, Innsbruck University



Agnes Erler

Thesis title:
Gewebespezifische Frostresistenz von reproduktiven Organen bei Hochgebirgspflanzen

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Barbara Kinigadner

Thesis title:
Ausbreitung des Kiefern-Prozessionsspinners (Thaumetopoea pityocampa Denis & Schiff.) im Eisacktal und der mögliche Einfluss des Klimawechsels auf das Verbreitungsareal

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Julia Mennel

Thesis title:
Radiale Wachstumsreaktion im Alpenraum verbreiteter Koniferen auf Trockenstress

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Isabell Mayer

Thesis title:
Die Ruderalvegetation der Dörfer im oberen und mittleren Inntal (Nordtirol)

Supervisor:
Susanne Wallnöfer, RG Population Biology and Vegetation Ecology, Innsbruck University



Anna Oberrauch

Thesis title:
Klimawandel lässt Schule und Forschung näher zusammenrücken: Analyse von Interessens- und Verständnisentwicklung im Rahmen des Sparkling Science-Projektes Top-Klima-Science

Supervisors:
Erich Tasser, Institut für Ökologie, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Susanne Plant

Thesis title:
Wenn SchülerInnen und Pflanzen neue Territorien erobern: Analyse von Interessens- und Verständnisentwicklung im Rahmen des Sparkling Science Projektes "Alien Invaders"

Supervisors:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Daniel Bargehr

Thesis title:
Auswirkung von winterlicher Dehydration auf die Frosthärte

Supervisors:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Petra Bucher-Spielmann

Thesis title:
Ein Kalkflachmoor und ein Kaltlufthangmoor im Gemeindegebiet von Absam (Nordtirol) aus vegetationsökologischer und fachdidaktischer Sicht

Supervisors:
Susanne Wallnöfer, RG Population Biology and Vegetation Ecology, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



David Bösch

Thesis title:
Effekte von Temperatur und Trockenstress auf das Keimverhalten von verschiedenen Strategietypen der Gattung Poa (P. alpina, P. annua und P. pratensis)

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Johann Wastian

Thesis title:
Schneealgen: Analyse löslicher Kohlenhydrate und ökophysiologische Aspekte

Supervisor:
Cornelius Lütz, Innsbruck University



Sonja Zimmermann

Thesis title:
Visualisierung der Eisbildung in Knospen der subalpinen Arten Larix decidua, Picea abies, Pinus cembra und Rhododendron ferrugineum

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Markus Seppi

Thesis title:
Dendroökologische Analyse subalpiner Waldbestände im Naturpark Texelgruppe (Südtirol)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Florian Schraffl

Thesis title:
Dendroökologische Untersuchungen zum Coniferenwachstum auf Moorstandorten im Alpenpark Karwendel

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Daniela Pistrich

Thesis title:
LehrErlebnispfad Stamser Eichenwald

Supervisors:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Roland Mayer

Thesis title:
Effects of anthropogenic impacts on subalpine and alpine ecosystems in the inner Oetz Valley (Central Alps, North Tyrol/Austria)

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University

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Project description:

Worldwide, terrestrial ecosystems are significantly changing due to human activities. These impacts also affect ecosystem functioning and biodiversity. In particular, arctic and alpine plant communities are reacting in a very sensitive way and are thus highly vulnerable. This PhD thesis comprises five studies on the effects of anthropogenic impacts, such as land-use changes (grazing exclusion, intensification and abandonment of pastures and meadows) and winter tourism (ski piste creation and preparation) on subalpine and alpine plant communities in the inner Oetz Valley (Austrian Central Alps, North-Tyrol). Throughout the investigation period of eight years, changes in community composition, proportions of functional groups and species number of a subalpine dwarf shrub heath, the lower and upper alpine pastures and glacier foreland vegetation were surveyed. The effects of the exclusion of large herbivores were studied from the subalpine to the upper alpine zones within and outside of fences. The responses of plant community composition, proportions of functional groups and species number were considered. The effects of artificial gap creation and seed addition on seedling recruitment in a lower alpine Nardus stricta community and a siliceous fen were investigated. The effects of land-use changes such as abandonment and intensification were analysed on subalpine and alpine pastures and meadows in two tributary valleys of the inner Oetz Valley (Obergurgl and Vent). In Obergurgl, winter tourism clearly dominates the economy whereas in Vent traditionally farming is still important. The consequences of ski piste creation, preparation and the annual sowing and fertilizing thereof were studied by comparing plant communities on a ski piste with the adjacent area from the subalpine to the upper alpine zones. The observed plant communities changed significantly throughout the investigation period and also species number significantly increased. Community composition and proportions of functional groups (dwarf shrubs, herbs, graminoids, legumes, mosses and lichens) shifted markedly along the whole altitudinal gradient. This result suggests that these habitats are affected by climate warming. Grazing exclusion significantly affected community composition of the standing vegetation. Significant shifts in the proportions of C-S-R strategy types can be regarded as signals of competition changes independent of the altitudinal zone. But no decrease in species number was detected. Due to the slow growth rates at high altitudes, a significant decrease in species number will probably take decades. In the lower alpine zone, significant microsite and seed limitation were detected in a siliceous fen, whereas in a Nardus stricta community at the same altitude, these effects were clearly of less importance. In the Nardus stricta-community the dry soil conditions and the competition of the highly dominating Nardus stricta-tussocks presumably reduced seedling emergence markedly. Overall, the study revealed that seedling recruitment is crucial even at high altitudes. The comparison of pastures and meadows between the two tributary valleys (Obergurgl and Vent) revealed significant differences in biodiversity. The low species number of the Trisetetum flavescentis in Obergurgl was probably caused by spatial homogeneity due to levelling and intensification of land-use near the village, whereas at the same time remote grasslands were abandoned. Also the community composition of the Sieversio-Nardetum strictae and the Trisetetum flavescentis, respectively, varied markedly between Obergugl and Vent. In Vent, the Sieversio-Nardetum strictae prevailed at higher mean altitudes compared to Obergurgl and it was in closer contact with other plant communities such as the Caricetum curvulae and the Larici-Pinetum cembrae. The study of the ski piste showed significant differences in plant community composition and proportions of functional groups compared to the adjacent area particularly in the alpine zone. On the ski piste, plant communities which are similar to snowbed vegetation clearly dominated. Legumes benefitted on the piste, whereas woody plants and lichens were considerably suppressed. The increased cover of mosses indicated a shortening of the vegetation period and an increase of soil moisture on the ski piste due to artificial snowing. Carex curvula grew sparsely at the edges of the pists and thus was effectively removed from the ski piste. Differences in species composition and proportions of functional groups between the ski piste and the adjacent area were clearly more significant than differences in species diversity. These results suggest that the creation of the ski piste approximately 25 years ago caused the most severe damages. Moreover, the preparation and the annual sowing and fertilizing also influenced the vegetation of the latter.




Carolina Walde

Thesis title:
Palynologische Untersuchungen zur Kulturlandschaftsgeschichte in Westtirol

Supervisor:
Klaus Oeggl, RG Palynology and Archaeobotany, Innsbruck University

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Project description:

Pollen analysis of the Heiterwanger Moor (Heiterwang/Außerfern), See-Eck (Nassereith/Gurgl vally), Plemun-Weiher (Fließ/upper Inn vally), Fuhrmannsloch (Nauders) and Floramoos (Glurns/Vinschgau) show the vegetation history and the anthropogenic impact in the western part of Tirol along the trail of the roman Via Claudia Augusta. Beginning with the Greenland Stadial 2a, the Heiterwanger Moor reflects the Preboreal oscillation, the 8200 cal. BP-Event and the Elm Decline at 5000 BP. A second Elm Decline is influenced by man. Human impact starts in Neolithic. Plemun-Weiher, Fuhrmannsloch and Floramoos show the use of larix-forests for pasturing. Intensive pasturing and settlement is demonstrated during Iron Age. During roman times the Via Claudia Augusta is attracting people because of its economic success. In mediaeval times mining leads to intensive anthropogenic influence.




Giovanna Flaim

Thesis title:
Ecological niches of dinoflagellates in Lake Tovel

Supervisor:
Eugen Rott, RG Hydrobotany, Innsbruck University

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Project description:

This thesis focuses on different aspects of the same general subject, the dinoflagellates of Lake Tovel or the environmental variables, in particular hydrology, that make this lake so unique. A general introduction is given to the dinoflagellates including an overview of evolution, ecology and morphology, and the rationale behind the thesis. Preliminary observations that cast doubt that Glenodinium sanguineum Marchesoni was not what it seemed to be were expressed in Flaim et al. (2003). After extensive limnological sampling of Tovel, and a critical examination of Baldi's publications, it became clear that more than one dinoflagellate species was involved. Like so many other aspects of Tovel, the bloom of the 'red' species was tied to hydrology, and the particularly hot 2003 summer provided confirmation of its role.
Tovel has a long limnological history which permitted the comparison of old plankton samples with new material. This was essential for the development of the three species theory. Furthermore, a scheme was proposed for the summer conditions necessary for a red bloom formation based on a broad comparison of the ecological requirements of the species involved. The use of stable isotopes gave some important insights into the peculiar hydrology that characterises Tovel when compared to other temperate lakes. The study of autecology of one of the three species, Borghiella dodgei, explained the recent off-colour and out-of-season blooms.




Annemarie Luggin

Thesis title:
Pflanzliche Makroreste aus der mittelalterlichen Bergbausiedlung Kristberg

Supervisor:
Klaus Oeggl, RG Palynology and Archaeobotany, Innsbruck University



Sabine Lath

Thesis title:
Einfluss nadelschädigender Pilze sowie Mykorrhiza auf die Verjüngung und das Wachstum von Koniferen an der alpinen Waldgrenze

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Fabian Nagl

Thesis title:
Vegetationskundliche Untersuchungen von Wiesen und Weiden im Raum Obergurgl

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Barbara Veit

Thesis title:
Einfluss von Klimafaktoren auf das Stammwachstum der Kiefer ("Pinus sylvestris") an einem inneralpinen Trockenstandort

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Hans Peter Neuner

Thesis title:
Neophytenkartierung im Raum Jenbach/Tirol

Supervisor:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University



Susanne Hollenstein

Thesis title:
Pollenkeimung und Pollenschlauchwachstum in Abhängigkeit von der Temperatur

Supervisor:
Johanna Wagner, RG Reproductive Biology, Innsbruck University



Veronika Kraler

Thesis title:
Vitalität und Funktionsdauer von Pollen in Gebirgspflanzen

Supervisor:
Johanna Wagner, RG Reproductive Biology, Innsbruck University



Jolanda Zimmermann

Thesis title:
Dynamik der Holzbildung von Pinus cembra im Waldgrenzökoton am Patscherkofel Dynamik und Temperaturabhängigkeit der Xylogenese

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Barbara Viehweider

Thesis title:
Flora und Vegetation von Felsgrusfluren und Sandrasen der Klasse Koelerio-Corynephoretea in Südtirol (Italien)

Supervisor:
Susanne Wallnöfer, RG Population Biology and Vegetation Ecology, Innsbruck University



Maya Massenz

Thesis title:
Neophyten in Südtirol: Ausbreitung und Verbreitung ausgewählter Arten

Supervisor:
Konrad Pagitz, RG Evolutionary Systematics, Innsbruck University



Klemens Handler

Thesis title:
Dendrohydrologische Rekonstruktion historischer Extremabflüsse des Tiroler Lech

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Maria Stocker

Thesis title:
Saisonaler Verlauf der stofflichen Zusammensetzung des Xylempresssafts

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Daniela Hosp

Thesis title:
Bestäubungseffizienz und Reproduktionserfolg bei Gebirgspflanzen

Supervisor:
Johanna Wagner, RG Reproductive Biology, Innsbruck University



Edith Kuprian

Thesis title:
PH-Werte im Xylem von subalpinen Holzpflanzen

Supervisors:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Elisabeth Raffl

Thesis title:
SchülerInnen entdecken das Pflanzenwachstum: eine Fallstudie aus dem forschend-entwickelnden Biologieunterricht, unter Berücksichtigung des Genderaspekts

Supervisors:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



David Oberkofler

Thesis title:
Pflanzen und Habitateigenschaften in 7 naturnahen Quellen Südtirols (Algen, Moose, höhere Pflanzen): eine Grundlagenerhebung für den Naturschutz

Supervisor:
Eugen Rott, RG Hydrobotany, Innsbruck University



Francois Kuborn

Thesis title:
Beitrag zur Flechtenflora Luxemburgs: die silicolen und lichenicolen Arten im Naturpark Obersauer

Supervisor:
Georg Gärtner, Innsbruck University



Wilhelm Stricker

Thesis title:
Dendroklimatologische Untersuchung des Wachstums von "Pinus cembra" entlang eines Höhentransektes in der Naturwaldzelle Ampasser Kessel

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Katharina Finch

Thesis title:
Diasporenregen im Gletschervorfeld des Rotmoosferners, Obergurgl, Ötztal

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Kay Cichini

Thesis title:
Phänologische und autökologische Untersuchungen des Neophyten "Impatiens parviflora" DC. an ausgewählten Standorten in Nord-Tirol und eine Evaluierung der OTC-Methode in Waldgesellschaften

Supervisor:
Sigmar Bortenschlager, Innsbruck University



Irina Kosaraz

Thesis title:
Die Ruderalvegetation in Innsbruck

Supervisor:
Susanne Wallnöfer, RG Population Biology and Vegetation Ecology, Innsbruck University



Andrea Leitner

Thesis title:
Einfluss klimatischer Faktoren auf das Radialwachstum von Koniferen an der Waldgrenze im Naturpark Puez-Geisler: Analyse artspezifischer und standortabhängiger Reaktionen auf die Klimaerwärmung

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Stefan Strobl

Thesis title:
Dynamik der Kambiumaktivität und Holzbildung von "Pinus sylvestris" an einem inneralpinen Trockenstandort

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Anja Burtscher

Thesis title:
Artenvielfalt in Schulgärten: neue Perspektiven durch Nutzung als ökologische Bildungseinrichtung

Supervisors:
Georg Gärtner, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Thea Gufler

Thesis title:
Wassertransport in Bäumen: methodischer Vergleich und didaktische Umsetzung

Supervisor:
Stefan Mayr, RG Ecophysiology, Innsbruck University



Christiane Kücher

Thesis title:
Gentechnische Verfahren und ihre möglichen Auswirkungen im Rahmen des Unterrichts für Genetik und Produktionsbiologie

Supervisor:
Sigmar Bortenschlager, Innsbruck University



Matthias Brünoth

Thesis title:
Nahrungspflanzen und ihre Inhaltsstoffe

Supervisors:
Johanna Wagner, RG Reproductive Biology, Innsbruck University
Suzanne Kapelari, Area of Science, Geography, Computer Science and Mathematics Education, Innsbruck University



Joachim Spindelböck

Thesis title:
Mesophyll freeze dehydration analysed by imaging Chlorophyll fluorescence

Supervisor:
Gilbert Neuner, RG Stress Physiology and Climate Resistance, Innsbruck University



Thomas Kiebacher

Thesis title:
Intra- and interspecific changes in plant functional traits in pairs of functionally related species along an altitudinal gradient in the Córdoba mountains (Argentina)

Supervisor:
Brigitta Erschbamer, RG Population Biology and Vegetation Ecology, Innsbruck University



Katrin Streil

Thesis title:
Die Blattproteinmuster von Pflanzen aus Hocharktis und Hochalpen im Vergleich

Supervisor:
Cornelius Lütz, Innsbruck University



Maria-Anna Obkircher

Thesis title:
Untersuchungen zur Hydraulik des Xylems und relevanter anatomischer Parameter von alpinen Rhododendron-Arten

Supervisor:
Stefan Mayr, RG Ecophysiology, Innsbruck University



Sabine Sladky-Meraner

Thesis title:
Flora auf Kies- und extensiv begrünten Dächern in Nordtirol

Supervisor:
Sigmar Bortenschlager, Innsbruck University



Baur Stefanie

Thesis title:
Klimatologische Interpretation holzanatomischer Strukturen der Fichte ("Picea abies") aus der Region Kleinwalsertal für den Zeitraum 1250 - 1800

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Peter Zangerle

Thesis title:
Dendroökologische Analyse des Einflusses von Überschotterungsereignissen auf ein hochmontanes Waldökosystem: Fallstudie in den Nördlichen Kalkalpen (Karwendel, Tirol)

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Marianne Eschgfeller

Thesis title:
Einfluss von Dürrestress auf das Wachstum der Spirke auf einem kalkalpinen Schuttfächer

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Mirjam Waldboth

Thesis title:
Dendroökologische Analyse des durch Edelkastanienrindenkrebs (Cryphonectria parasitica [Murrill] Barr) induzierten Kastaniensterbens (Castanea sativa Mill.) in Südtirol

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Daniel Baumgartner

Thesis title:
Wachstum der Zirbe (Pinus cembra L.) im alpinen Waldgrenzökoton am Patscherkofel: Dynamik und Temperaturabhängigkeit der Xylogenese

Supervisor:
Walter Oberhuber, RG Dendroecology and Tree Physiology, Innsbruck University



Stephanie Widmann

Thesis title:
Blütenentwicklung und Phänologie von Hochgebirgspflanzen

Supervisor:
Johanna Wagner, RG Reproductive Biology, Innsbruck University



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