19.06.2019: Botanisches Kolloquium

Das Institut für Botanik lädt zum Vortrag im Rahmen des Botanischen Kolloquiums SS 2019 ein:

Quaternary disappearance of tree taxa from Europe
Prof. Dr. Donatella Magri, Sapienza University of Rome

19.06.2019 17:00 Uhr
Hörsaal A
Institut für Botanik, Sternwartestr. 15, 6020 Innsbruck

Inhalt: The progressive disappearance of tree taxa from Europe in the course of the late Cenozoic, and their persistence in East Asia and/or eastern North America, has long been recognized. The first papers highlighting this question, based on seed floras, date back to more than one century ago. Since then, following a considerable increase in the number of published Early and Middle Pleistocene pollen records in Europe and a significant refinement of the chronological setting of the Quaternary stages, our knowledge of the timing of disappearance of tree taxa from Europe has much improved. The timing of extinction, distributed over the whole Quaternary, appears very diverse from one region to the other. The geographical patterns of persistence/disappearance of taxa show unexpected trends and rule out a simple North to South and/or West to East trend in extirpations. In particular, it is possible to detect disjunct populations (Engelhardia), long-term persistence of taxa in restricted regions (Sciadopitys), distinct populations/species/genera in different geographical areas (Taxodium type). Some taxa that are still widespread in Europe have undergone extirpation in Mediterranean areas in the lateglacial period and Holocene (Buxus, Carpinus betulus, Picea); they provide an indication of the modes of disappearance of tree populations that may be useful to evaluate the vulnerability of modern fragmented plant populations. The possible causes for the extirpation of tree populations, including extreme environments, climate changes and diseases will be presented and discussed.

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