Psychrophilic Biomass Producers in the Trophic Chain of the Microbial Community of Lake Untersee, Antarctica
The study of photosynthetic microorganisms from the Lake Untersee samples showed dispersed distribution of phototrophs within ~80 m water column. Lake Untersee represents a unique ecosystem that experienced complete isolation: sealed by the Anuchin Glacier for many millennia. Consequently, its bioce...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20100035253 2023-05-15T13:43:16+02:00 Psychrophilic Biomass Producers in the Trophic Chain of the Microbial Community of Lake Untersee, Antarctica Pikuta, Elena V. Hoover, Richard B. Unclassified, Unlimited, Publicly available August 2010 application/pdf http://hdl.handle.net/2060/20100035253 unknown Document ID: 20100035253 http://hdl.handle.net/2060/20100035253 Copyright, Distribution as joint owner in the copyright CASI Life Sciences (General) M10-0380 Instruments, Methods and Mission for Astrobiology X111; 1-6 Aug. 2010; San Diego, CA; United States 2010 ftnasantrs 2019-07-21T01:10:50Z The study of photosynthetic microorganisms from the Lake Untersee samples showed dispersed distribution of phototrophs within ~80 m water column. Lake Untersee represents a unique ecosystem that experienced complete isolation: sealed by the Anuchin Glacier for many millennia. Consequently, its biocenosis has evolved over a significant period of time without exchange or external interaction with species from other environments. The major producers of organic matter in Lake Untersee are represented by phototrophic and chemolithotrophic microorganisms. This is the traditional trophic scheme for lacustrine ecosystems on Earth. Among the phototrophs, diatoms were not found, which differentiates this lake from other known ecosystems. The dominant species among phototrophs was Chlamydomonas sp. with typical morphostructure: green chloroplasts, bright red round spot, and two polar flagella near the opening. As expected, the physiology of studied phototrophs was limited by low temperature, which defined them as obligate psychrophilic microorganisms. By the quantity estimation of methanogenesis in this lake, the litho-autotrophic production of organic matter is competitive with phototrophic production. However, pure cultures of methanogens have not yet been obtained. We discuss the primary producers of organic matter and the participation of our novel psychrophilic homoacetogen into the litho-autotrophic link of biomass production in Lake Untersee. Other/Unknown Material Antarc* Antarctica Anuchin Glacier NASA Technical Reports Server (NTRS) Anuchin Glacier ENVELOPE(13.517,13.517,-71.283,-71.283) Untersee ENVELOPE(13.467,13.467,-71.350,-71.350) |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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topic |
Life Sciences (General) |
spellingShingle |
Life Sciences (General) Pikuta, Elena V. Hoover, Richard B. Psychrophilic Biomass Producers in the Trophic Chain of the Microbial Community of Lake Untersee, Antarctica |
topic_facet |
Life Sciences (General) |
description |
The study of photosynthetic microorganisms from the Lake Untersee samples showed dispersed distribution of phototrophs within ~80 m water column. Lake Untersee represents a unique ecosystem that experienced complete isolation: sealed by the Anuchin Glacier for many millennia. Consequently, its biocenosis has evolved over a significant period of time without exchange or external interaction with species from other environments. The major producers of organic matter in Lake Untersee are represented by phototrophic and chemolithotrophic microorganisms. This is the traditional trophic scheme for lacustrine ecosystems on Earth. Among the phototrophs, diatoms were not found, which differentiates this lake from other known ecosystems. The dominant species among phototrophs was Chlamydomonas sp. with typical morphostructure: green chloroplasts, bright red round spot, and two polar flagella near the opening. As expected, the physiology of studied phototrophs was limited by low temperature, which defined them as obligate psychrophilic microorganisms. By the quantity estimation of methanogenesis in this lake, the litho-autotrophic production of organic matter is competitive with phototrophic production. However, pure cultures of methanogens have not yet been obtained. We discuss the primary producers of organic matter and the participation of our novel psychrophilic homoacetogen into the litho-autotrophic link of biomass production in Lake Untersee. |
format |
Other/Unknown Material |
author |
Pikuta, Elena V. Hoover, Richard B. |
author_facet |
Pikuta, Elena V. Hoover, Richard B. |
author_sort |
Pikuta, Elena V. |
title |
Psychrophilic Biomass Producers in the Trophic Chain of the Microbial Community of Lake Untersee, Antarctica |
title_short |
Psychrophilic Biomass Producers in the Trophic Chain of the Microbial Community of Lake Untersee, Antarctica |
title_full |
Psychrophilic Biomass Producers in the Trophic Chain of the Microbial Community of Lake Untersee, Antarctica |
title_fullStr |
Psychrophilic Biomass Producers in the Trophic Chain of the Microbial Community of Lake Untersee, Antarctica |
title_full_unstemmed |
Psychrophilic Biomass Producers in the Trophic Chain of the Microbial Community of Lake Untersee, Antarctica |
title_sort |
psychrophilic biomass producers in the trophic chain of the microbial community of lake untersee, antarctica |
publishDate |
2010 |
url |
http://hdl.handle.net/2060/20100035253 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(13.517,13.517,-71.283,-71.283) ENVELOPE(13.467,13.467,-71.350,-71.350) |
geographic |
Anuchin Glacier Untersee |
geographic_facet |
Anuchin Glacier Untersee |
genre |
Antarc* Antarctica Anuchin Glacier |
genre_facet |
Antarc* Antarctica Anuchin Glacier |
op_source |
CASI |
op_relation |
Document ID: 20100035253 http://hdl.handle.net/2060/20100035253 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766186545894653952 |