Paramecium - Deutsche Gesellschaft für Protozoologie / German ...

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Protists in an acid mining lake – life at the extreme Michael Moser, Ulrike Scheffel, Peter Stadler, Thomas Weisse Institut für Limnologie der Österreichischen Akademie der Wissenschaften Acid mining lakes (AML) are extreme habitats with pH ranging from 2 to 5. Due to the oxidation of pyrite, associated with brown and black coal deposits, these lakes have been acidified and exhibit very high iron concentrations. Biodiversity is reduced to a few protist and rotifer species. Protists play a major role in these lakes, and the mixotrophs Chlamydomonas acidophila and Ochromonas sp. may contribute most to primary production and bacterivory; ciliates are less important in the food web. In a new research project funded by the Austrian Science Fund (FWF), we compare the protist communities in two AML located in Langau, Lower Austria, and Lusatia, Eastern Germany. We investigate the pH tolerance and the pH adaptation of the major players to test the hypothesis that acidotolerant species benefit from competitive release under acidic stress. First experimental results with Chlamydomonas acidophila demonstrate that these organisms are well adapted to low pH. Highest growth rates were achieved at pH ranging from 2.5 to 3.5, whereas no growth was obtained at neutral pH. michael.moser@assoc.oeaw.ac.at ulrike.scheffel@oeaw.ac.at peter.stadler@oeaw.ac.at thomas.weisse@oeaw.ac.at 45
Niche separation and coexistence of chrysophytes: The case study ‘Loibersbacher Teiche’ Steffen Jost, Jens Boenigk Institut für Limnologie der Österreichischen Akademie der Wissenschaften The Loibersbacher Teiche are slightly acidic ponds within the Alpine Lake Gradient investigated in our group. We investigated the seasonal plankton dynamics, the effect of zooplankton predation on the plankton community and the pH adaptation of the dominant chrysomonad taxa, i.e. Ochromonas sp., Dinobryon pediforme and Synura sphagnicola. Despite a similar community composition and largely similar abiotic parameters in the two investigated ponds, the plankton community develops differently in both ponds. We will discuss potential key factors involved in the differential plankton community development. steffen.jost@oeaw.ac.at jens.boenigk@oeaw.ac.at 46
Page 1 and 2: 27. Jahrestagung der Deutschen Gese
Page 3 and 4: Mittwoch, 05.03.2008 ab 16 Uhr Regi
Page 5 and 6: Freitag, 07.03.2008 9.00-9.40 Plena
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Page 9 and 10: Diversität 9. Anke Oertel, Wilhelm
Page 11 and 12: Abstracts Plenarvorträge 12
Page 13 and 14: In situ diversity of marine heterot
Page 15 and 16: A hidden world of protists in our o
Page 17 and 18: Vorträge 18
Page 19 and 20: Testing the competition-colonizatio
Page 21 and 22: Die Bedeutung von Mixotrophie in Ge
Page 23 and 24: Anoxicity structures microbial euka
Page 25 and 26: Unexpected morphological and functi
Page 27 and 28: Invasion und Ausbreitung mobiler In
Page 29 and 30: How did the last common ancestor of
Page 31 and 32: Size dependent interaction of flage
Page 33 and 34: Konsument und Ressource: Bottom-up
Page 35 and 36: Protozoan cell and organelle motili
Page 37 and 38: Primer development for the detectio
Page 39 and 40: Gravitation and light dependent swi
Page 41 and 42: Amoebae in carbonate precipitating
Page 43: Ochromonas spp. - A small but power
Page 47 and 48: Bestimmung der Wachstumsrate und de
Page 49 and 50: Heterotrophe Protozoen in einer mik
Page 51 and 52: Drei neue, haptoride Boden-Ciliaten
Page 53 and 54: Improving target-taxa recovery in d
Page 55 and 56: New choanoflagellate species from D
Page 57 and 58: Rare and likely new heterotrophic f
Page 59 and 60: Ultrastructure and molecular phylog
Page 61 and 62: Changes in the three-dimensional st
Page 63 and 64: Protein phosphatase 2B (PP2B, calci
Page 65 and 66: Antisense transcripts in Paramecium
Page 67 and 68: Ulrike-Gabriele Berninger Universit
Page 69 and 70: Norbert Hülsmann Freie Universitä
Page 71 and 72: Michael Moser Institut für Limnolo
Page 73 and 74: Annette Schlüssel Lechenicher Str.
Page 75: Christine Willen Universität zu K

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