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Prokaryotic assemblages in the maritime Antarctic Lake Limnopolar (Byers Peninsula, South Shetland Islands).
Extremophiles : Life Under Extreme Conditions 2017 November
The potentially metabolically active components within the prokaryotic assemblages inhabiting the Antarctic Lake Limnopolar (Byers Peninsula, Maritime Antarctica) were investigated by a polyphasic approach which included culture-dependent and culture-independent methods (based on RNA molecules). Results support previous observations on the Proteobacteria and Bacteroidetes dominance, followed by Actinobacteria, in Antarctic lakes. In particular, Alpha-, Betaproteobacteria and Bacteroidetes were mainly detected by CARD-FISH and cDNA cloning, whereas Gammaproteobacteria and Actinobacteria dominated within the cultivable fraction. Overall, this study demonstrates the survival potential and physiological heterogeneity of the prokaryotic community in the Lake Limnopolar. The microbial community composition in the lake is affected by external influences (such as marine environment by sea spray and seabird dropping, and microbial mats and mosses of the catchment). However, most external bacteria would be inactive, whereas typical polar taxa dominate the potentially active fraction and are subsidized by external nutrient sources, thus assuming the main biogeochemical roles within the lake.
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