The geochemistry of methane in Lake Fryxell, an amictic, permanently ice-covered, antarctic lake

Richard L. Smith; Laurence G. Miller; Brian L. Howes

doi:10.1007/bf00000873

Vertical distribution of organic constituents in an Antarctic lake: Lake Fryxell

High Latitude Limnology ◽

10.1007/978-94-009-2603-5_21 ◽

1989 ◽

pp. 291-303 ◽

Cited By ~ 3

Author(s):

Genki I. Matsumoto ◽

Kunihiko Watanuki ◽

Tetsuya Torrii

Keyword(s):

Vertical Distribution ◽

Antarctic Lake ◽

Organic Constituents ◽

Lake Fryxell

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Remarkable Diversity of Phototrophic Purple Bacteria in a Permanently Frozen Antarctic Lake

Applied and Environmental Microbiology ◽

10.1128/aem.69.8.4910-4914.2003 ◽

2003 ◽

Vol 69 (8) ◽

pp. 4910-4914 ◽

Cited By ~ 107

Author(s):

Elizabeth A. Karr ◽

W. Matthew Sattley ◽

Deborah O. Jung ◽

Michael T. Madigan ◽

Laurie A. Achenbach

Keyword(s):

Bacterial Communities ◽

Purple Bacteria ◽

Specific Gene ◽

Dry Valleys ◽

Purple Nonsulfur Bacteria ◽

Gas Vesicles ◽

Antarctic Lake ◽

Lake Fryxell ◽

The Antarctic

ABSTRACT Although anoxygenic photosynthesis is thought to play an important role in the primary productivity of permanently frozen lakes in the Antarctic dry valleys, the bacterial communities responsible for this metabolism remain uncharacterized. Here we report the composition and activity of phototrophic purple bacteria in Lake Fryxell, Antarctica, as determined by analysis of a photosynthesis-specific gene, pufM. The results revealed an extensive diversity and highly stratified distribution of purple nonsulfur bacteria in Lake Fryxell and showed which phylotypes produced pufM transcripts in situ. Enrichment cultures for purple bacteria yielded two morphotypes, each with a pufM signature identical to signatures detected by environmental screening. The isolates also contained gas vesicles, buoyancy structures previously unknown in purple nonsulfur bacteria, that may be necessary for these organisms to position themselves at specific depths within the nearly freezing water column.

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Vertical Distribution of Bacterial Population in Lake Fryxell, an Antarctic Lake.

Japanese Journal of Limnology (Rikusuigaku Zasshi) ◽

10.3739/rikusui.55.185 ◽

1994 ◽

Vol 55 (3) ◽

pp. 185-192 ◽

Cited By ~ 3

Author(s):

Toshifumi KONDA ◽

Susumu TAKII ◽

Manabu FUKUI ◽

Yasushi KUSUOKA ◽

Genki I. MATSUMOTO ◽

...

Keyword(s):

Vertical Distribution ◽

Bacterial Population ◽

Antarctic Lake ◽

Lake Fryxell

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Solar heating of Lake Fryxell, a permanently ice-covered Antarctic lake

Journal of Geophysical Research Atmospheres ◽

10.1029/jz070i006p01555 ◽

1965 ◽

Vol 70 (6) ◽

pp. 1555-1558 ◽

Cited By ~ 25

Author(s):

R. A. Hoare ◽

K. B. Popplewell ◽

D. A. House ◽

R. A. Henderson ◽

W. M. Prebble ◽

...

Keyword(s):

Solar Heating ◽

Antarctic Lake ◽

Lake Fryxell

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Antibiotic Resistance Genes from Mat and Planktonic Microbiomes of Antarctic Lake Fryxell and Lake Bonney, and a Mat-forming Culture of Rhodoferax antarcticus

10.1101/2021.12.17.473166 ◽

2021 ◽

Author(s):

Sheetal Tallada ◽

Grant Hall ◽

Daniel Barich ◽

Joan L Slonczewski

Keyword(s):

Antibiotic Resistance ◽

Resistance Genes ◽

Water Samples ◽

Antibiotic Resistance Genes ◽

Water Bodies ◽

Antarctic Lake ◽

Lake Fryxell ◽

Rhodoferax Antarcticus ◽

Lift Off ◽

The Antarctic

The Antarctic Taylor Valley Lakes Fryxell and Bonney harbor oligotrophic microbial communities that are separated geographically from other aquatic systems. Their microbiomes include planktonic as well as lift-off mat communities that float to the underside of the perennial ice cover and eventually emerge at the surface. We investigated the antibiotic resistance genes (ARGs) from metagenomes of lift-off mats emerging from ice, from filtered water samples of Lake Fryxell, and from filtered water samples of Lake Bonney. ARG sequence markers were designed by ShortBRED-Identify using the Comprehensive Antibiotic Resistance Database (CARD). The overall proportion of ARG hits in the metagenomes was found to be similar to that found in temperate-zone rural water bodies with moderate human inputs (0.0002-0.0007%). The specific ARGs found showed distinct distributions for the two lakes, and for mat versus planktonic sources. An enrichment culture of Rhodoferax antarcticus from a Lake Fryxell mat sample showed a mat-forming phenotype not previously reported for this species. Its genome showed no ARGs associated with Betaproteobacteria, but had ARGs consistent with a Pseudomonas minor component. The Antarctic lake mats and water showed specific ARGs distinctive to the mat and water sources, but overall ARG levels were similar to those of temperate water bodies.

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