Paramecium - Deutsche Gesellschaft für Protozoologie / German ...

Anoxicity structures microbial eukaryote communities in the
anoxic Gotland Deep
Alexandra Stock 1 , Klaus Jürgens 2 , Thorsten Stoeck 1
1 TU Kaiserslautern, FB Biologie
2 Institut für Ostseeforschung Warnemünde
The anoxic Gotland Deep in the central Baltic Sea is a chemically
stratified habitat characterized by gradients of environmental parameters.
A major research focus in this deep basin is the investigation
of prokaryote microbial communities. Regarding microbial eukaryotes
(protists) information is scarce. The aims of our study were: (i)
the identification of protists thriving in this oxygen-depleted environment;
(ii) their comparison with other marine anoxic environments;
and (iii) to reveal if the protistan communities are structured along the
stratification gradient. We targeted small subunit ribosomal RNA
molecules extracted from environmental sample material and performed
phylogenetic analyses and community structure comparisons.
The protistan community structure below the chemocline differs significantly
from the one immediately above the chemocline. An overlap
of taxa between the two communities under comparisons is only
minimal, indicating a highly specialized community thriving below
the chemocline. We identified (the lack of) oxygen as the dominant
factor explaining the structural patterns of the two communities.
astock@rhrk.uni-kl.de
klaus.juergens@io-warnemuende.de
stoeck@rhrk.uni-kl.de
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