Arctic Ocean microbial community structure before and after the 2007 record sea ice minimum.

Increasing global temperatures are having a profound impact in the Arctic, including the dramatic loss of multiyear sea ice in 2007 that has continued to the present. The majority of life in the Arctic is microbial and the consequences of climate-mediated changes on microbial marine food webs, which...

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Autores principales:	André M Comeau, William K W Li, Jean-Éric Tremblay, Eddy C Carmack, Connie Lovejoy
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b87b73ca44d44361a876d8348365fdef
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spelling	oai:doaj.org-article:b87b73ca44d44361a876d8348365fdef2021-11-18T07:34:37ZArctic Ocean microbial community structure before and after the 2007 record sea ice minimum.1932-620310.1371/journal.pone.0027492https://doaj.org/article/b87b73ca44d44361a876d8348365fdef2011-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22096583/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Increasing global temperatures are having a profound impact in the Arctic, including the dramatic loss of multiyear sea ice in 2007 that has continued to the present. The majority of life in the Arctic is microbial and the consequences of climate-mediated changes on microbial marine food webs, which are responsible for biogeochemical cycling and support higher trophic levels, are unknown. We examined microbial communities over time by using high-throughput sequencing of microbial DNA collected between 2003 and 2010 from the subsurface chlorophyll maximum (SCM) layer of the Beaufort Sea (Canadian Arctic). We found that overall this layer has freshened and concentrations of nitrate, the limiting nutrient for photosynthetic production in Arctic seas, have decreased. We compared microbial communities from before and after the record September 2007 sea ice minimum and detected significant differences in communities from all three domains of life. In particular, there were significant changes in species composition of Eukarya, with ciliates becoming more common and heterotrophic marine stramenopiles (MASTs) accounting for a smaller proportion of sequences retrieved after 2007. Within the Archaea, Marine Group I Thaumarchaeota, which earlier represented up to 60% of the Archaea sequences in this layer, have declined to <10%. Bacterial communities overall were less diverse after 2007, with a significant decrease of the Bacteroidetes. These significant shifts suggest that the microbial food webs are sensitive to physical oceanographic changes such as those occurring in the Canadian Arctic over the past decade.André M ComeauWilliam K W LiJean-Éric TremblayEddy C CarmackConnie LovejoyPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 11, p e27492 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q André M Comeau William K W Li Jean-Éric Tremblay Eddy C Carmack Connie Lovejoy Arctic Ocean microbial community structure before and after the 2007 record sea ice minimum.
description	Increasing global temperatures are having a profound impact in the Arctic, including the dramatic loss of multiyear sea ice in 2007 that has continued to the present. The majority of life in the Arctic is microbial and the consequences of climate-mediated changes on microbial marine food webs, which are responsible for biogeochemical cycling and support higher trophic levels, are unknown. We examined microbial communities over time by using high-throughput sequencing of microbial DNA collected between 2003 and 2010 from the subsurface chlorophyll maximum (SCM) layer of the Beaufort Sea (Canadian Arctic). We found that overall this layer has freshened and concentrations of nitrate, the limiting nutrient for photosynthetic production in Arctic seas, have decreased. We compared microbial communities from before and after the record September 2007 sea ice minimum and detected significant differences in communities from all three domains of life. In particular, there were significant changes in species composition of Eukarya, with ciliates becoming more common and heterotrophic marine stramenopiles (MASTs) accounting for a smaller proportion of sequences retrieved after 2007. Within the Archaea, Marine Group I Thaumarchaeota, which earlier represented up to 60% of the Archaea sequences in this layer, have declined to <10%. Bacterial communities overall were less diverse after 2007, with a significant decrease of the Bacteroidetes. These significant shifts suggest that the microbial food webs are sensitive to physical oceanographic changes such as those occurring in the Canadian Arctic over the past decade.
format	article
author	André M Comeau William K W Li Jean-Éric Tremblay Eddy C Carmack Connie Lovejoy
author_facet	André M Comeau William K W Li Jean-Éric Tremblay Eddy C Carmack Connie Lovejoy
author_sort	André M Comeau
title	Arctic Ocean microbial community structure before and after the 2007 record sea ice minimum.
title_short	Arctic Ocean microbial community structure before and after the 2007 record sea ice minimum.
title_full	Arctic Ocean microbial community structure before and after the 2007 record sea ice minimum.
title_fullStr	Arctic Ocean microbial community structure before and after the 2007 record sea ice minimum.
title_full_unstemmed	Arctic Ocean microbial community structure before and after the 2007 record sea ice minimum.
title_sort	arctic ocean microbial community structure before and after the 2007 record sea ice minimum.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/b87b73ca44d44361a876d8348365fdef
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Arctic Ocean microbial community structure before and after the 2007 record sea ice minimum.

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