Glacial meltwater and seasonality influence community composition of diazotrophs in Arctic coastal and open waters

Abstract The Arctic Ocean is particularly affected by climate change with unknown consequences for primary productivity. Diazotrophs—prokaryotes capable of converting atmospheric nitrogen to ammonia—have been detected in the often nitrogen-limited Arctic Ocean but distribution and community composit...

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Published in:FEMS Microbiology Ecology
Main Authors: von Friesen, Lisa W, Paulsen, Maria L, Müller, Oliver, Gründger, Friederike, Riemann, Lasse
Other Authors: Danish Council for Independent Research, Research Council of Norway, Villum Foundation
Format: Article in Journal/Newspaper
Language:English
Published: Oxford University Press (OUP) 2023
Subjects:
Online Access:http://dx.doi.org/10.1093/femsec/fiad067
https://academic.oup.com/femsec/advance-article-pdf/doi/10.1093/femsec/fiad067/50683648/fiad067.pdf
https://academic.oup.com/femsec/article-pdf/99/8/fiad067/51708065/fiad067.pdf
id croxfordunivpr:10.1093/femsec/fiad067
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spelling croxfordunivpr:10.1093/femsec/fiad067 2024-04-28T08:06:12+00:00 Glacial meltwater and seasonality influence community composition of diazotrophs in Arctic coastal and open waters von Friesen, Lisa W Paulsen, Maria L Müller, Oliver Gründger, Friederike Riemann, Lasse Danish Council for Independent Research Research Council of Norway Villum Foundation 2023 http://dx.doi.org/10.1093/femsec/fiad067 https://academic.oup.com/femsec/advance-article-pdf/doi/10.1093/femsec/fiad067/50683648/fiad067.pdf https://academic.oup.com/femsec/article-pdf/99/8/fiad067/51708065/fiad067.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model FEMS Microbiology Ecology volume 99, issue 8 ISSN 1574-6941 Applied Microbiology and Biotechnology Ecology Microbiology journal-article 2023 croxfordunivpr https://doi.org/10.1093/femsec/fiad067 2024-04-02T08:05:27Z Abstract The Arctic Ocean is particularly affected by climate change with unknown consequences for primary productivity. Diazotrophs—prokaryotes capable of converting atmospheric nitrogen to ammonia—have been detected in the often nitrogen-limited Arctic Ocean but distribution and community composition dynamics are largely unknown. We performed amplicon sequencing of the diazotroph marker gene nifH from glacial rivers, coastal, and open ocean regions and identified regionally distinct Arctic communities. Proteobacterial diazotrophs dominated all seasons, epi- to mesopelagic depths and rivers to open waters and, surprisingly, Cyanobacteria were only sporadically identified in coastal and freshwaters. The upstream environment of glacial rivers influenced diazotroph diversity, and in marine samples putative anaerobic sulphate-reducers showed seasonal succession with highest prevalence in summer to polar night. Betaproteobacteria (Burkholderiales, Nitrosomonadales, and Rhodocyclales) were typically found in rivers and freshwater-influenced waters, and Delta- (Desulfuromonadales, Desulfobacterales, and Desulfovibrionales) and Gammaproteobacteria in marine waters. The identified community composition dynamics, likely driven by runoff, inorganic nutrients, particulate organic carbon, and seasonality, imply diazotrophy a phenotype of ecological relevance with expected responsiveness to ongoing climate change. Our study largely expands baseline knowledge of Arctic diazotrophs—a prerequisite to understand underpinning of nitrogen fixation—and supports nitrogen fixation as a contributor of new nitrogen in the rapidly changing Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Ocean Climate change polar night Oxford University Press FEMS Microbiology Ecology
institution Open Polar
collection Oxford University Press
op_collection_id croxfordunivpr
language English
topic Applied Microbiology and Biotechnology
Ecology
Microbiology
spellingShingle Applied Microbiology and Biotechnology
Ecology
Microbiology
von Friesen, Lisa W
Paulsen, Maria L
Müller, Oliver
Gründger, Friederike
Riemann, Lasse
Glacial meltwater and seasonality influence community composition of diazotrophs in Arctic coastal and open waters
topic_facet Applied Microbiology and Biotechnology
Ecology
Microbiology
description Abstract The Arctic Ocean is particularly affected by climate change with unknown consequences for primary productivity. Diazotrophs—prokaryotes capable of converting atmospheric nitrogen to ammonia—have been detected in the often nitrogen-limited Arctic Ocean but distribution and community composition dynamics are largely unknown. We performed amplicon sequencing of the diazotroph marker gene nifH from glacial rivers, coastal, and open ocean regions and identified regionally distinct Arctic communities. Proteobacterial diazotrophs dominated all seasons, epi- to mesopelagic depths and rivers to open waters and, surprisingly, Cyanobacteria were only sporadically identified in coastal and freshwaters. The upstream environment of glacial rivers influenced diazotroph diversity, and in marine samples putative anaerobic sulphate-reducers showed seasonal succession with highest prevalence in summer to polar night. Betaproteobacteria (Burkholderiales, Nitrosomonadales, and Rhodocyclales) were typically found in rivers and freshwater-influenced waters, and Delta- (Desulfuromonadales, Desulfobacterales, and Desulfovibrionales) and Gammaproteobacteria in marine waters. The identified community composition dynamics, likely driven by runoff, inorganic nutrients, particulate organic carbon, and seasonality, imply diazotrophy a phenotype of ecological relevance with expected responsiveness to ongoing climate change. Our study largely expands baseline knowledge of Arctic diazotrophs—a prerequisite to understand underpinning of nitrogen fixation—and supports nitrogen fixation as a contributor of new nitrogen in the rapidly changing Arctic Ocean.
author2 Danish Council for Independent Research
Research Council of Norway
Villum Foundation
format Article in Journal/Newspaper
author von Friesen, Lisa W
Paulsen, Maria L
Müller, Oliver
Gründger, Friederike
Riemann, Lasse
author_facet von Friesen, Lisa W
Paulsen, Maria L
Müller, Oliver
Gründger, Friederike
Riemann, Lasse
author_sort von Friesen, Lisa W
title Glacial meltwater and seasonality influence community composition of diazotrophs in Arctic coastal and open waters
title_short Glacial meltwater and seasonality influence community composition of diazotrophs in Arctic coastal and open waters
title_full Glacial meltwater and seasonality influence community composition of diazotrophs in Arctic coastal and open waters
title_fullStr Glacial meltwater and seasonality influence community composition of diazotrophs in Arctic coastal and open waters
title_full_unstemmed Glacial meltwater and seasonality influence community composition of diazotrophs in Arctic coastal and open waters
title_sort glacial meltwater and seasonality influence community composition of diazotrophs in arctic coastal and open waters
publisher Oxford University Press (OUP)
publishDate 2023
url http://dx.doi.org/10.1093/femsec/fiad067
https://academic.oup.com/femsec/advance-article-pdf/doi/10.1093/femsec/fiad067/50683648/fiad067.pdf
https://academic.oup.com/femsec/article-pdf/99/8/fiad067/51708065/fiad067.pdf
genre Arctic
Arctic Ocean
Climate change
polar night
genre_facet Arctic
Arctic Ocean
Climate change
polar night
op_source FEMS Microbiology Ecology
volume 99, issue 8
ISSN 1574-6941
op_rights https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model
op_doi https://doi.org/10.1093/femsec/fiad067
container_title FEMS Microbiology Ecology
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