Decreased Snow Cover Stimulates Under-Ice Primary Producers but Impairs Methanotrophic Capacity
Climate change scenarios anticipate decreased spring snow cover in boreal and subarctic regions. Forest lakes are abundant in these regions and substantial contributors of methane emissions. To investigate the effect of reduced snow cover, we experimentally removed snow from an anoxic frozen lake. W...
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ftuppsalauniv:oai:DiVA.org:uu-379775 2023-05-15T18:28:33+02:00 Decreased Snow Cover Stimulates Under-Ice Primary Producers but Impairs Methanotrophic Capacity Garcia, Sarahi L Szekely, Anna J. Bergvall, Christoffer Schattenhofer, Martha Peura, S. 2019 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379775 https://doi.org/10.1128/mSphere.00626-18 eng eng Uppsala universitet, Limnologi Swedish Univ Agr Sci, Sci Life Lab, Dept Forest Mycol & Plant Pathol, Uppsala, Sweden;Uppsala Univ, Dept Cell & Mol Biol, Uppsala, Sweden AMER SOC MICROBIOLOGY mSphere, 2019, 4:1, http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379775 doi:10.1128/mSphere.00626-18 PMID 30626619 ISI:000460444700033 info:eu-repo/semantics/openAccess climate change greenhouse gas lakes methane methanotrophs microorganisms primary production snow cover Environmental Sciences Miljövetenskap Article in journal info:eu-repo/semantics/article text 2019 ftuppsalauniv https://doi.org/10.1128/mSphere.00626-18 2023-02-23T21:54:06Z Climate change scenarios anticipate decreased spring snow cover in boreal and subarctic regions. Forest lakes are abundant in these regions and substantial contributors of methane emissions. To investigate the effect of reduced snow cover, we experimentally removed snow from an anoxic frozen lake. We observed that the removal of snow increased light penetration through the ice, increasing water temperature and modifying microbial composition in the different depths. Chlorophyll a and b concentrations increased in the upper water column, suggesting activation of algal primary producers. At the same time, Chlorobiaceae, one of the key photosynthetic bacterial families in anoxic lakes, shifted to lower depths. Moreover, a decrease in the relative abundance of methanotrophs within the bacterial family Methylococcaceae was detected, concurrent with an increase in methane concentration in the water column. These results indicate that decreased snow cover impacts both primary production and methane production and/or consumption, which may ultimately lead to increased methane emissions after spring ice off. IMPORTANCE Small lakes are an important source of greenhouse gases in the boreal zone. These lakes are severely impacted by the winter season, when ice and snow cover obstruct gas exchange between the lake and the atmosphere and diminish light availability in the water column. Currently, climate change is resulting in reduced spring snow cover. A short-term removal of the snow from the ice stimulated algal primary producers and subsequently heterotrophic bacteria. Concurrently, the relative abundance of methanotrophic bacteria decreased and methane concentrations increased. Our results increase the general knowledge of microbial life under ice and, specifically, the understanding of the potential impact of climate change on boreal lakes. Article in Journal/Newspaper Subarctic Uppsala University: Publications (DiVA) Frozen Lake ENVELOPE(76.108,76.108,-69.415,-69.415) mSphere 4 1 |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
climate change greenhouse gas lakes methane methanotrophs microorganisms primary production snow cover Environmental Sciences Miljövetenskap |
spellingShingle |
climate change greenhouse gas lakes methane methanotrophs microorganisms primary production snow cover Environmental Sciences Miljövetenskap Garcia, Sarahi L Szekely, Anna J. Bergvall, Christoffer Schattenhofer, Martha Peura, S. Decreased Snow Cover Stimulates Under-Ice Primary Producers but Impairs Methanotrophic Capacity |
topic_facet |
climate change greenhouse gas lakes methane methanotrophs microorganisms primary production snow cover Environmental Sciences Miljövetenskap |
description |
Climate change scenarios anticipate decreased spring snow cover in boreal and subarctic regions. Forest lakes are abundant in these regions and substantial contributors of methane emissions. To investigate the effect of reduced snow cover, we experimentally removed snow from an anoxic frozen lake. We observed that the removal of snow increased light penetration through the ice, increasing water temperature and modifying microbial composition in the different depths. Chlorophyll a and b concentrations increased in the upper water column, suggesting activation of algal primary producers. At the same time, Chlorobiaceae, one of the key photosynthetic bacterial families in anoxic lakes, shifted to lower depths. Moreover, a decrease in the relative abundance of methanotrophs within the bacterial family Methylococcaceae was detected, concurrent with an increase in methane concentration in the water column. These results indicate that decreased snow cover impacts both primary production and methane production and/or consumption, which may ultimately lead to increased methane emissions after spring ice off. IMPORTANCE Small lakes are an important source of greenhouse gases in the boreal zone. These lakes are severely impacted by the winter season, when ice and snow cover obstruct gas exchange between the lake and the atmosphere and diminish light availability in the water column. Currently, climate change is resulting in reduced spring snow cover. A short-term removal of the snow from the ice stimulated algal primary producers and subsequently heterotrophic bacteria. Concurrently, the relative abundance of methanotrophic bacteria decreased and methane concentrations increased. Our results increase the general knowledge of microbial life under ice and, specifically, the understanding of the potential impact of climate change on boreal lakes. |
format |
Article in Journal/Newspaper |
author |
Garcia, Sarahi L Szekely, Anna J. Bergvall, Christoffer Schattenhofer, Martha Peura, S. |
author_facet |
Garcia, Sarahi L Szekely, Anna J. Bergvall, Christoffer Schattenhofer, Martha Peura, S. |
author_sort |
Garcia, Sarahi L |
title |
Decreased Snow Cover Stimulates Under-Ice Primary Producers but Impairs Methanotrophic Capacity |
title_short |
Decreased Snow Cover Stimulates Under-Ice Primary Producers but Impairs Methanotrophic Capacity |
title_full |
Decreased Snow Cover Stimulates Under-Ice Primary Producers but Impairs Methanotrophic Capacity |
title_fullStr |
Decreased Snow Cover Stimulates Under-Ice Primary Producers but Impairs Methanotrophic Capacity |
title_full_unstemmed |
Decreased Snow Cover Stimulates Under-Ice Primary Producers but Impairs Methanotrophic Capacity |
title_sort |
decreased snow cover stimulates under-ice primary producers but impairs methanotrophic capacity |
publisher |
Uppsala universitet, Limnologi |
publishDate |
2019 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379775 https://doi.org/10.1128/mSphere.00626-18 |
long_lat |
ENVELOPE(76.108,76.108,-69.415,-69.415) |
geographic |
Frozen Lake |
geographic_facet |
Frozen Lake |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
mSphere, 2019, 4:1, http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379775 doi:10.1128/mSphere.00626-18 PMID 30626619 ISI:000460444700033 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1128/mSphere.00626-18 |
container_title |
mSphere |
container_volume |
4 |
container_issue |
1 |
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1766211086509408256 |