Alexandra Pitt


Present position:

Project assistant

Research area:

Environmental Microbiology


+43(0)512507 50245

Academic and Employment History ·  Publications


Academic and Employment History



Aquirufa: biodiversity and ecology of freshwater bacteria/Aquirufa: Biodiversität und Ökologie von SüßwasserbakterienSparkling Science, OeAD, ongoing
Weitere Informationen auf der Projektwebseiteinformations about the project in English


  • Pitt A., Lienbacher S., Schmidt J., Neumann Schaal M., Wolf J., Hahn M.W. (2024). Description of a new freshwater bacterium Aquirufa regiilacus sp. nov., classification of the genera Aquirufa, Arundinibacter, Sandaracinomonas, and Tellurirhabdus to the family Spirosomataceae, classification of the genus Chryseotalea to the family Fulvivirgaceae and Litoribacter to the family Cyclobacteriaceae, as well as classification of Litoribacter alkaliphilus as a later heterotypic synonym of Litoribacter ruber. Archives of Microbiology 206(79),

  • Pitt A., Hahn M. (2023). Wissen schaffen mit Citizen Scientists: Biodiversität und Ökologie von Süßwasserbakterien. Biologie in unserer Zeit, 53(3): 272–279.

  • Hahn M.W.,  Pitt A., Schmidt​ J., Koll​ U., Wolf J. Whitman W.B., Bodelier P.L.E, Neumann-Schaal M. (2022). Zwartia hollandica gen. nov., sp. nov., Jezberella montanilacus gen. nov., sp. nov. and Sheuella amnicola gen. nov., comb. nov., representing the environmental GKS98 (betIII) cluster. Int. J. Syst. Evol. Microbiol. 72:9, 1-13.

  • Hahn M.W., Pitt A., Schmidt J., Camacho A. (2022). Fourteen new Polynucleobacter species: P. brandtiae sp. nov., P. kasalickyi sp. nov., P. antarcticus sp. nov., P. arcticus sp. nov., P. tropicus sp. nov., P. bastaniensis sp. nov., P. corsicus sp. nov., P. finlandensis sp. nov., P. ibericus sp. nov., P. hallstattensis sp. nov., P. alcilacus sp. nov., P. nymphae sp. nov., P. paludilacus sp. nov. and P. parvulilacunae sp. nov. Int. J. Syst. Evol. Microbiol.: 72(6):005408.

  • Pitt A., Koll U., Schmidt J., Neumann-.Schaal M., Wolf J., Krausz S., Hahn M.W. (2022). Aquirufa lenticrescens sp. nov. and Aquirufa aurantiipilula sp. nov.: two new species of a lineage of widespread freshwater bacteria. Arch Microbiol 204: 356,  

  • Hahn M.W., Huemer A, Pitt A., Hoetzinger M. (2021). Opening a next-generation black box: ecological trends for hundreds of species-like taxa uncovered within a single bacterial >99% 16S rRNA operational taxonomic unit. Molecular Ecology Resources 21:2471–2485.

  • Hahn M.W., Pitt A., Koll U., Schmidt J., Maresca J.A., Neumann-Schaal M. (2021). Aurantimicrobium photophilum sp. nov., a non-photosynthetic bacterium adjusting its metabolism to the diurnal light cycle and reclassification of Cryobacterium mesophilum as Terrimesophilobacter mesophilus gen. nov., comb. nov. Int J Syst Evol Microbiol 71(8):004975.

  • Hahn M.W., Pitt A. (2021). Silvanigrella. Bergey's Manual of Systematics of Archaea and Bacteria. pp. 1-9.

  • Pitt A., Schmidt J., Koll U., Hahn M.W. (2021). Aquiluna borgnonia gen. nov., sp. nov., a member of a Microbacteriaceae lineage of freshwater bacteria with small genome sizes. Int J Syst Evol Microbiol 71:5

  • Hoetzinger M., Pitt A., Huemer A., Hahn, M.W. (2021). Continental-scale gene flow prevents allopatric divergence of pelagic freshwater bacteria. Genome Biology and Evolution, 13:3, evab019,

  • Pitt A., Koll U., Schmidt J., Hahn M. W. (2020). Aquirufa ecclesiirivi sp. nov. and Aquirufa beregesia sp. nov., isolated from a small creek and classification of Allopseudarcicella aquatilis as a later heterotypic synonym of Aquirufa nivalisilvae. Int J Syst Evol Microbiol 70: 4602–4609.  

  • Pitt A., Schmidt J., Koll U., Hahn M. W. (2020). Linking research and science communication by cooperating with school classes, Proceedings of Science PoS(ACSC2019)010 

  • Pitt A., Koll U., Schmidt J., Hahn M.W. (2020). Fluviispira multicolorata gen. nov., sp. nov. and Silvanigrella paludirubra sp. nov., isolated from freshwater habitats. Int J Syst Evol Microbiol 70: 1630-1638.

  • Pitt A., Schmidt J., Koll U., Hahn M.W. (2020). Rariglobus hedericola gen. nov., sp. nov., belonging to the Verrucomicrobia, isolated from a temperate freshwater habitat. Int J Syst Evol Microbiol 70:1830-1836,

  • Pitt A., Schmidt J., Koll U., Hahn M.W. (2019). Rhodoluna limnophila sp. nov., a bacterium with 1.4 Mbp genome size isolated from freshwater habitats located in Salzburg, Austria. Int J Syst Evol Microbiol 69:3946-3954,

  • Limberger R., Pitt A., Hahn M. W., Wickham S. A. (2019). Spatial insurance in multi-trophic metacommunities. Ecology Letters 22:1828-1837, doi: 10.1111/ele.13365

  • Pitt A., Schmidt J., Koll U., Hahn M.W. (2019). Aquirufa antheringensis gen. nov., sp. nov. and Aquirufa nivalisilvae sp. nov., representing a new genus of widespread freshwater bacteria. Int J Syst Evol Microbiol 69:2739-2749 doi 10.1099/ijsem.0.003554

  • Pitt A., Hahn M.W. (2019). Mikrobiologie in der Schule: Erforschung unbekannter Gewässerbakterien, Biologie in unserer Zeit, 49(2): 131-137 doi:10.1002/biuz.201910672

  • Hoetzinger M., Schmidt J., Pitt, A., Koll U., Lang E., Hahn, M.W. (2019) Polynucleobacter paneuropaeus sp. nov., characterized by six strains isolated from freshwater lakes located along a 3000 km north–south cross-section across Europe. Int J Syst Evol Microbiol 69: 203–213

  • Pitt A., Schmidt J., Lang E., Whitman W.B., Woyke T., Hahn M. W. (2018). Polynucleobacter meluiroseus sp. nov., a bacterium isolated from a lake located in the mountains of the Mediterranean island of Corsica. International Journal of Systematic and Evolutionary Microbiology 68: 1975-1985, doi: 10.1099/ijsem.0.002777

  • Hahn M.W., Schmidt J., Koll U., Rohde M., Verbarg S., Pitt  A., Nakai R., Naganuma T., Lang E. (2017). Silvanigrella aquatica gen. nov., sp. nov., isolated from a freshwater lake, description of Silvanigrellaceae fam. nov. and Silvanigrellales ord. nov., reclassification of the order Bdellovibrionales in the class Oligoflexia, reclassification of the families Bacteriovoracaceae and Halobacteriovoraceae in the new order Bacteriovoracales ord. nov., and reclassification of the family Pseudobacteriovoracaceae in the order Oligoflexales. Int J Syst Evol Microbiol 67:2555–2568  doi:

  • Hahn M. W., Schmidt J., Pitt A., Taipale S. J., Lang E. (2016). Reclassification of four Polynucleobacter necessarius strains as Polynucleobacter asymbioticus comb. nov., Polynucleobacter duraquae sp. nov., Polynucleobacter yangtzensis sp. nov., and Polynucleobacter sinensis sp. nov., and emended description of the species Polynucleobacter necessarius. Int. J. Syst. Evol. Microbiol. 66: 2883–2892. PDF

  • Gimeno A., Meikl M., Pitt A., Winkler M., Berninger U. (2015). Testing of fire salamanders around Salzburg for Batrachochytrium salamandrivorans in the framework of a school project. eco.mont 7(1): 72-76. Link

  • Meikl M., Gimeno A., Mühl S., Pitt A., Winkler M., Berninger U. (2014). Alpen- und Feuersalamander in Österreich und Europa: Ein Sparkling Science Projekt der Universität Salzburg in Zusammenarbeit mit Schulen. ANLiegen Natur 36(1): 120-124. Link


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