Influence of the polar light cycle on seasonal dynamics of an Antarctic lake microbial community.
BackgroundCold environments dominate the Earth's biosphere and microbial activity drives ecosystem processes thereby contributing greatly to global biogeochemical cycles. Polar environments differ to all other cold environments by experiencing 24-h sunlight in summer and no sunlight in winter....
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ftcdlib:oai:escholarship.org:ark:/13030/qt8z8188m1 2023-08-27T04:06:11+02:00 Influence of the polar light cycle on seasonal dynamics of an Antarctic lake microbial community. Panwar, Pratibha Allen, Michelle A Williams, Timothy J Hancock, Alyce M Brazendale, Sarah Bevington, James Roux, Simon Páez-Espino, David Nayfach, Stephen Berg, Maureen Schulz, Frederik Chen, I-Min A Huntemann, Marcel Shapiro, Nicole Kyrpides, Nikos C Woyke, Tanja Eloe-Fadrosh, Emiley A Cavicchioli, Ricardo 116 2020-08-01 application/pdf https://escholarship.org/uc/item/8z8188m1 unknown eScholarship, University of California qt8z8188m1 https://escholarship.org/uc/item/8z8188m1 public Microbiome, vol 8, iss 1 Ecosystem Seasons Photoperiod Antarctic Regions Aquatic Organisms Lakes Microbiota Antarctic microbiology Green sulfur bacteria Host-virus interactions Meromictic lake Metagenome time series Microbial food web Phototroph Polar light cycle Life Below Water Ecology Microbiology Medical Microbiology article 2020 ftcdlib 2023-08-07T18:05:02Z BackgroundCold environments dominate the Earth's biosphere and microbial activity drives ecosystem processes thereby contributing greatly to global biogeochemical cycles. Polar environments differ to all other cold environments by experiencing 24-h sunlight in summer and no sunlight in winter. The Vestfold Hills in East Antarctica contains hundreds of lakes that have evolved from a marine origin only 3000-7000 years ago. Ace Lake is a meromictic (stratified) lake from this region that has been intensively studied since the 1970s. Here, a total of 120 metagenomes representing a seasonal cycle and four summers spanning a 10-year period were analyzed to determine the effects of the polar light cycle on microbial-driven nutrient cycles.ResultsThe lake system is characterized by complex sulfur and hydrogen cycling, especially in the anoxic layers, with multiple mechanisms for the breakdown of biopolymers present throughout the water column. The two most abundant taxa are phototrophs (green sulfur bacteria and cyanobacteria) that are highly influenced by the seasonal availability of sunlight. The extent of the Chlorobium biomass thriving at the interface in summer was captured in underwater video footage. The Chlorobium abundance dropped from up to 83% in summer to 6% in winter and 1% in spring, before rebounding to high levels. Predicted Chlorobium viruses and cyanophage were also abundant, but their levels did not negatively correlate with their hosts.ConclusionOver-wintering expeditions in Antarctica are logistically challenging, meaning insight into winter processes has been inferred from limited data. Here, we found that in contrast to chemolithoautotrophic carbon fixation potential of Southern Ocean Thaumarchaeota, this marine-derived lake evolved a reliance on photosynthesis. While viruses associated with phototrophs also have high seasonal abundance, the negative impact of viral infection on host growth appeared to be limited. The microbial community as a whole appears to have developed a capacity to generate ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Southern Ocean University of California: eScholarship Antarctic Southern Ocean East Antarctica Vestfold Hills Vestfold Ace Lake ENVELOPE(78.188,78.188,-68.472,-68.472) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Ecosystem Seasons Photoperiod Antarctic Regions Aquatic Organisms Lakes Microbiota Antarctic microbiology Green sulfur bacteria Host-virus interactions Meromictic lake Metagenome time series Microbial food web Phototroph Polar light cycle Life Below Water Ecology Microbiology Medical Microbiology |
spellingShingle |
Ecosystem Seasons Photoperiod Antarctic Regions Aquatic Organisms Lakes Microbiota Antarctic microbiology Green sulfur bacteria Host-virus interactions Meromictic lake Metagenome time series Microbial food web Phototroph Polar light cycle Life Below Water Ecology Microbiology Medical Microbiology Panwar, Pratibha Allen, Michelle A Williams, Timothy J Hancock, Alyce M Brazendale, Sarah Bevington, James Roux, Simon Páez-Espino, David Nayfach, Stephen Berg, Maureen Schulz, Frederik Chen, I-Min A Huntemann, Marcel Shapiro, Nicole Kyrpides, Nikos C Woyke, Tanja Eloe-Fadrosh, Emiley A Cavicchioli, Ricardo Influence of the polar light cycle on seasonal dynamics of an Antarctic lake microbial community. |
topic_facet |
Ecosystem Seasons Photoperiod Antarctic Regions Aquatic Organisms Lakes Microbiota Antarctic microbiology Green sulfur bacteria Host-virus interactions Meromictic lake Metagenome time series Microbial food web Phototroph Polar light cycle Life Below Water Ecology Microbiology Medical Microbiology |
description |
BackgroundCold environments dominate the Earth's biosphere and microbial activity drives ecosystem processes thereby contributing greatly to global biogeochemical cycles. Polar environments differ to all other cold environments by experiencing 24-h sunlight in summer and no sunlight in winter. The Vestfold Hills in East Antarctica contains hundreds of lakes that have evolved from a marine origin only 3000-7000 years ago. Ace Lake is a meromictic (stratified) lake from this region that has been intensively studied since the 1970s. Here, a total of 120 metagenomes representing a seasonal cycle and four summers spanning a 10-year period were analyzed to determine the effects of the polar light cycle on microbial-driven nutrient cycles.ResultsThe lake system is characterized by complex sulfur and hydrogen cycling, especially in the anoxic layers, with multiple mechanisms for the breakdown of biopolymers present throughout the water column. The two most abundant taxa are phototrophs (green sulfur bacteria and cyanobacteria) that are highly influenced by the seasonal availability of sunlight. The extent of the Chlorobium biomass thriving at the interface in summer was captured in underwater video footage. The Chlorobium abundance dropped from up to 83% in summer to 6% in winter and 1% in spring, before rebounding to high levels. Predicted Chlorobium viruses and cyanophage were also abundant, but their levels did not negatively correlate with their hosts.ConclusionOver-wintering expeditions in Antarctica are logistically challenging, meaning insight into winter processes has been inferred from limited data. Here, we found that in contrast to chemolithoautotrophic carbon fixation potential of Southern Ocean Thaumarchaeota, this marine-derived lake evolved a reliance on photosynthesis. While viruses associated with phototrophs also have high seasonal abundance, the negative impact of viral infection on host growth appeared to be limited. The microbial community as a whole appears to have developed a capacity to generate ... |
format |
Article in Journal/Newspaper |
author |
Panwar, Pratibha Allen, Michelle A Williams, Timothy J Hancock, Alyce M Brazendale, Sarah Bevington, James Roux, Simon Páez-Espino, David Nayfach, Stephen Berg, Maureen Schulz, Frederik Chen, I-Min A Huntemann, Marcel Shapiro, Nicole Kyrpides, Nikos C Woyke, Tanja Eloe-Fadrosh, Emiley A Cavicchioli, Ricardo |
author_facet |
Panwar, Pratibha Allen, Michelle A Williams, Timothy J Hancock, Alyce M Brazendale, Sarah Bevington, James Roux, Simon Páez-Espino, David Nayfach, Stephen Berg, Maureen Schulz, Frederik Chen, I-Min A Huntemann, Marcel Shapiro, Nicole Kyrpides, Nikos C Woyke, Tanja Eloe-Fadrosh, Emiley A Cavicchioli, Ricardo |
author_sort |
Panwar, Pratibha |
title |
Influence of the polar light cycle on seasonal dynamics of an Antarctic lake microbial community. |
title_short |
Influence of the polar light cycle on seasonal dynamics of an Antarctic lake microbial community. |
title_full |
Influence of the polar light cycle on seasonal dynamics of an Antarctic lake microbial community. |
title_fullStr |
Influence of the polar light cycle on seasonal dynamics of an Antarctic lake microbial community. |
title_full_unstemmed |
Influence of the polar light cycle on seasonal dynamics of an Antarctic lake microbial community. |
title_sort |
influence of the polar light cycle on seasonal dynamics of an antarctic lake microbial community. |
publisher |
eScholarship, University of California |
publishDate |
2020 |
url |
https://escholarship.org/uc/item/8z8188m1 |
op_coverage |
116 |
long_lat |
ENVELOPE(78.188,78.188,-68.472,-68.472) |
geographic |
Antarctic Southern Ocean East Antarctica Vestfold Hills Vestfold Ace Lake |
geographic_facet |
Antarctic Southern Ocean East Antarctica Vestfold Hills Vestfold Ace Lake |
genre |
Antarc* Antarctic Antarctica East Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Southern Ocean |
op_source |
Microbiome, vol 8, iss 1 |
op_relation |
qt8z8188m1 https://escholarship.org/uc/item/8z8188m1 |
op_rights |
public |
_version_ |
1775346966109093888 |