Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the South Indian Ocean and the Southern Ocean
Biogeochemical cycling of carbon (C) and nitrogen (N) in the ocean depends on both the composition and activity of underlying biological communities and on abiotic factors. The Southern Ocean is encircled by a series of strong currents and fronts, providing a barrier to microbial dispersion into adj...
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ftarchimer:oai:archimer.ifremer.fr:79672 2023-05-15T18:24:38+02:00 Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the South Indian Ocean and the Southern Ocean Hörstmann, Cora Raes, Eric J Buttigieg, Pier Luigi Lo Monaco, Claire John, Uwe Waite, Anya M 2021 application/pdf https://archimer.ifremer.fr/doc/00685/79672/82448.pdf https://archimer.ifremer.fr/doc/00685/79672/82449.zip https://archimer.ifremer.fr/doc/00685/79672/85976.pdf https://archimer.ifremer.fr/doc/00685/79672/85977.zip https://doi.org/10.5194/bg-2021-52 https://archimer.ifremer.fr/doc/00685/79672/ eng eng Copernicus GmbH https://archimer.ifremer.fr/doc/00685/79672/82448.pdf https://archimer.ifremer.fr/doc/00685/79672/82449.zip https://archimer.ifremer.fr/doc/00685/79672/85976.pdf https://archimer.ifremer.fr/doc/00685/79672/85977.zip doi:10.5194/bg-2021-52 https://archimer.ifremer.fr/doc/00685/79672/ info:eu-repo/semantics/openAccess restricted use Biogeosciences (1726-4189) (Copernicus GmbH), 2021 , Vol. 18 , P. 3733-3749 text Publication info:eu-repo/semantics/article 2021 ftarchimer https://doi.org/10.5194/bg-2021-52 2021-09-23T20:37:08Z Biogeochemical cycling of carbon (C) and nitrogen (N) in the ocean depends on both the composition and activity of underlying biological communities and on abiotic factors. The Southern Ocean is encircled by a series of strong currents and fronts, providing a barrier to microbial dispersion into adjacent oligotrophic gyres. Our study region straddles the boundary between the nutrient-rich Southern Ocean and the adjacent oligotrophic gyre of the South Indian Ocean, providing an ideal region to study changes in microbial productivity. Here, we measured the impact of C- and N- uptake on microbial community diversity, contextualized by hydrographic factors and local physico-chemical conditions across the Southern Ocean and South Indian Ocean. We observed that contrasting physico-chemical characteristics led to unique microbial diversity patterns, with significant correlations between microbial alpha diversity and primary productivity (PP). However, we detected no link between specific PP (PP normalized by chlorophyll a concentration) and microbial alpha and beta diversity. Prokaryotic alpha and beta diversity were correlated with biological N2 fixation, itself a prokaryotic process, and we detected measurable N2 fixation to 60° S. While regional water masses have distinct microbial genetic fingerprints in both the eukaryotic and prokaryotic fractions, PP and N2 fixation vary more gradually and regionally. This suggests that microbial phylogenetic diversity is more strongly bounded by physical oceanographic features, while microbial activity responds more to chemical factors. We conclude that concomitant assessments of microbial diversity and activity is central in understanding the dynamics and complex responses of microorganisms to a changing ocean environment. Article in Journal/Newspaper Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Indian Southern Ocean |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Biogeochemical cycling of carbon (C) and nitrogen (N) in the ocean depends on both the composition and activity of underlying biological communities and on abiotic factors. The Southern Ocean is encircled by a series of strong currents and fronts, providing a barrier to microbial dispersion into adjacent oligotrophic gyres. Our study region straddles the boundary between the nutrient-rich Southern Ocean and the adjacent oligotrophic gyre of the South Indian Ocean, providing an ideal region to study changes in microbial productivity. Here, we measured the impact of C- and N- uptake on microbial community diversity, contextualized by hydrographic factors and local physico-chemical conditions across the Southern Ocean and South Indian Ocean. We observed that contrasting physico-chemical characteristics led to unique microbial diversity patterns, with significant correlations between microbial alpha diversity and primary productivity (PP). However, we detected no link between specific PP (PP normalized by chlorophyll a concentration) and microbial alpha and beta diversity. Prokaryotic alpha and beta diversity were correlated with biological N2 fixation, itself a prokaryotic process, and we detected measurable N2 fixation to 60° S. While regional water masses have distinct microbial genetic fingerprints in both the eukaryotic and prokaryotic fractions, PP and N2 fixation vary more gradually and regionally. This suggests that microbial phylogenetic diversity is more strongly bounded by physical oceanographic features, while microbial activity responds more to chemical factors. We conclude that concomitant assessments of microbial diversity and activity is central in understanding the dynamics and complex responses of microorganisms to a changing ocean environment. |
format |
Article in Journal/Newspaper |
author |
Hörstmann, Cora Raes, Eric J Buttigieg, Pier Luigi Lo Monaco, Claire John, Uwe Waite, Anya M |
spellingShingle |
Hörstmann, Cora Raes, Eric J Buttigieg, Pier Luigi Lo Monaco, Claire John, Uwe Waite, Anya M Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the South Indian Ocean and the Southern Ocean |
author_facet |
Hörstmann, Cora Raes, Eric J Buttigieg, Pier Luigi Lo Monaco, Claire John, Uwe Waite, Anya M |
author_sort |
Hörstmann, Cora |
title |
Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the South Indian Ocean and the Southern Ocean |
title_short |
Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the South Indian Ocean and the Southern Ocean |
title_full |
Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the South Indian Ocean and the Southern Ocean |
title_fullStr |
Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the South Indian Ocean and the Southern Ocean |
title_full_unstemmed |
Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the South Indian Ocean and the Southern Ocean |
title_sort |
hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the south indian ocean and the southern ocean |
publisher |
Copernicus GmbH |
publishDate |
2021 |
url |
https://archimer.ifremer.fr/doc/00685/79672/82448.pdf https://archimer.ifremer.fr/doc/00685/79672/82449.zip https://archimer.ifremer.fr/doc/00685/79672/85976.pdf https://archimer.ifremer.fr/doc/00685/79672/85977.zip https://doi.org/10.5194/bg-2021-52 https://archimer.ifremer.fr/doc/00685/79672/ |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Biogeosciences (1726-4189) (Copernicus GmbH), 2021 , Vol. 18 , P. 3733-3749 |
op_relation |
https://archimer.ifremer.fr/doc/00685/79672/82448.pdf https://archimer.ifremer.fr/doc/00685/79672/82449.zip https://archimer.ifremer.fr/doc/00685/79672/85976.pdf https://archimer.ifremer.fr/doc/00685/79672/85977.zip doi:10.5194/bg-2021-52 https://archimer.ifremer.fr/doc/00685/79672/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.5194/bg-2021-52 |
_version_ |
1766205391737192448 |