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Niche Specialization of Bacterial Residents in Permanently Ice-covered Lakes of the McMurdo Dry Valleys, Antarctica

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Title
Niche Specialization of Bacterial Residents in Permanently Ice-covered Lakes of the McMurdo Dry Valleys, Antarctica
Other Titles
Niche Specialization of Bacterial Residents in Permanently Ice-covered Lakes of the McMurdo Dry Valleys, Antarctica
Authors
Kwon, Miye
Kim, Ok-Sun
Kim, Sang Jong
Lee, Joohan
Hong, Soon Gyu
John C Priscu
Kim, Mincheol
Keywords
Bacterial diversity; Ice-covered Lakes of the McMurdo Dry Valleys; Micorobiology
Issue Date
2015
Citation
Kwon, Miye, et al. 2015. Niche Specialization of Bacterial Residents in Permanently Ice-covered Lakes of the McMurdo Dry Valleys, Antarctica. 6th International Conference on Polar and Alpine Microbiology. 체코. 2015.09.06~2015.09.10.
Abstract
Perennially ice-covered lakes across McMurdo dry valleys are chemically stratified and characterized by their own distinct limnology and biogeochemistry. Despite the specialty of ecological features in these extreme environments, detailed information about what microbes reside and how they differ by different lakes and depths are still little understood. Here, we investigated bacterial diversity in five different ice-covered Antarctic lakes at a range of depths using 16S rRNA gene-based pyrosequencing. Although more similar compositions found towards upper layers, bacterial communities are overall distinctive to each lake and depth, with paralleling their unique biogeochemical characteristics. Surprisingly, certain bacterial lineages are exclusively confined to a specific depth of each lake. Candidate division WM88 occurred at 15 m depth of Lake Fryxell solely, while unknown lineages of Chlorobi are found only at the depth of 18 m in Lake Miers. The 30 m depth of East and West Lake Bonney was occupied by two distinct Firmicutes classes. Different size fractions and strong associations with various physicochemical variables give additional information about ecology and metabolic potential of these bacteria. These mysterious features would be consequences of their long-lasting adaptations to the extreme and unique environments of ice-covered lakes in Antarctica.
URI
http://repository.kopri.re.kr/handle/201206/8145
Conference Name
6th International Conference on Polar and Alpine Microbiology
Conference Place
체코
Conference Date
2015.09.06~2015.09.10
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