Environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical North Atlantic Ocean.
During the winter of 2006 we measured nifH gene abundances, dinitrogen (N(2)) fixation rates and carbon fixation rates in the eastern tropical and sub-tropical North Atlantic Ocean. The dominant diazotrophic phylotypes were filamentous cyanobacteria, which may include Trichodesmium and Katagnymene,...
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ftdoajarticles:oai:doaj.org/article:f6bb7d039cb24241b25c7df914209733 2023-05-15T17:32:02+02:00 Environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical North Atlantic Ocean. Micha J A Rijkenberg Rebecca J Langlois Matthew M Mills Matthew D Patey Polly G Hill Maria C Nielsdóttir Tanya J Compton Julie Laroche Eric P Achterberg 2011-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0028989 https://doaj.org/article/f6bb7d039cb24241b25c7df914209733 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC3236774?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0028989 https://doaj.org/article/f6bb7d039cb24241b25c7df914209733 PLoS ONE, Vol 6, Iss 12, p e28989 (2011) Medicine R Science Q article 2011 ftdoajarticles https://doi.org/10.1371/journal.pone.0028989 2022-12-31T02:24:39Z During the winter of 2006 we measured nifH gene abundances, dinitrogen (N(2)) fixation rates and carbon fixation rates in the eastern tropical and sub-tropical North Atlantic Ocean. The dominant diazotrophic phylotypes were filamentous cyanobacteria, which may include Trichodesmium and Katagnymene, with up to 10(6) L(-1)nifH gene copies, unicellular group A cyanobacteria with up to 10(5) L(-1)nifH gene copies and gamma A proteobacteria with up to 10(4) L(-1)nifH gene copies. N(2) fixation rates were low and ranged between 0.032-1.28 nmol N L(-1) d(-1) with a mean of 0.30 ± 0.29 nmol N L(-1) d(-1) (1σ, n = 65). CO(2)-fixation rates, representing primary production, appeared to be nitrogen limited as suggested by low dissolved inorganic nitrogen to phosphate ratios (DIN:DIP) of about 2 ± 3.2 in surface waters. Nevertheless, N(2) fixation rates contributed only 0.55 ± 0.87% (range 0.03-5.24%) of the N required for primary production. Boosted regression trees analysis (BRT) showed that the distribution of the gamma A proteobacteria and filamentous cyanobacteria nifH genes was mainly predicted by the distribution of Prochlorococcus, Synechococcus, picoeukaryotes and heterotrophic bacteria. In addition, BRT indicated that multiple a-biotic environmental variables including nutrients DIN, dissolved organic nitrogen (DON) and DIP, trace metals like dissolved aluminum (DAl), as a proxy of dust inputs, dissolved iron (DFe) and Fe-binding ligands as well as oxygen and temperature influenced N(2) fixation rates and the distribution of the dominant diazotrophic phylotypes. Our results suggest that lower predicted oxygen concentrations and higher temperatures due to climate warming may increase N(2) fixation rates. However, the balance between a decreased supply of DIP and DFe from deep waters as a result of more pronounced stratification and an enhanced supply of these nutrients with a predicted increase in deposition of Saharan dust may ultimately determine the consequences of climate warming for N(2) fixation in the North ... Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles PLoS ONE 6 12 e28989 |
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Medicine R Science Q Micha J A Rijkenberg Rebecca J Langlois Matthew M Mills Matthew D Patey Polly G Hill Maria C Nielsdóttir Tanya J Compton Julie Laroche Eric P Achterberg Environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical North Atlantic Ocean. |
topic_facet |
Medicine R Science Q |
description |
During the winter of 2006 we measured nifH gene abundances, dinitrogen (N(2)) fixation rates and carbon fixation rates in the eastern tropical and sub-tropical North Atlantic Ocean. The dominant diazotrophic phylotypes were filamentous cyanobacteria, which may include Trichodesmium and Katagnymene, with up to 10(6) L(-1)nifH gene copies, unicellular group A cyanobacteria with up to 10(5) L(-1)nifH gene copies and gamma A proteobacteria with up to 10(4) L(-1)nifH gene copies. N(2) fixation rates were low and ranged between 0.032-1.28 nmol N L(-1) d(-1) with a mean of 0.30 ± 0.29 nmol N L(-1) d(-1) (1σ, n = 65). CO(2)-fixation rates, representing primary production, appeared to be nitrogen limited as suggested by low dissolved inorganic nitrogen to phosphate ratios (DIN:DIP) of about 2 ± 3.2 in surface waters. Nevertheless, N(2) fixation rates contributed only 0.55 ± 0.87% (range 0.03-5.24%) of the N required for primary production. Boosted regression trees analysis (BRT) showed that the distribution of the gamma A proteobacteria and filamentous cyanobacteria nifH genes was mainly predicted by the distribution of Prochlorococcus, Synechococcus, picoeukaryotes and heterotrophic bacteria. In addition, BRT indicated that multiple a-biotic environmental variables including nutrients DIN, dissolved organic nitrogen (DON) and DIP, trace metals like dissolved aluminum (DAl), as a proxy of dust inputs, dissolved iron (DFe) and Fe-binding ligands as well as oxygen and temperature influenced N(2) fixation rates and the distribution of the dominant diazotrophic phylotypes. Our results suggest that lower predicted oxygen concentrations and higher temperatures due to climate warming may increase N(2) fixation rates. However, the balance between a decreased supply of DIP and DFe from deep waters as a result of more pronounced stratification and an enhanced supply of these nutrients with a predicted increase in deposition of Saharan dust may ultimately determine the consequences of climate warming for N(2) fixation in the North ... |
format |
Article in Journal/Newspaper |
author |
Micha J A Rijkenberg Rebecca J Langlois Matthew M Mills Matthew D Patey Polly G Hill Maria C Nielsdóttir Tanya J Compton Julie Laroche Eric P Achterberg |
author_facet |
Micha J A Rijkenberg Rebecca J Langlois Matthew M Mills Matthew D Patey Polly G Hill Maria C Nielsdóttir Tanya J Compton Julie Laroche Eric P Achterberg |
author_sort |
Micha J A Rijkenberg |
title |
Environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical North Atlantic Ocean. |
title_short |
Environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical North Atlantic Ocean. |
title_full |
Environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical North Atlantic Ocean. |
title_fullStr |
Environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical North Atlantic Ocean. |
title_full_unstemmed |
Environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical North Atlantic Ocean. |
title_sort |
environmental forcing of nitrogen fixation in the eastern tropical and sub-tropical north atlantic ocean. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2011 |
url |
https://doi.org/10.1371/journal.pone.0028989 https://doaj.org/article/f6bb7d039cb24241b25c7df914209733 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
PLoS ONE, Vol 6, Iss 12, p e28989 (2011) |
op_relation |
http://europepmc.org/articles/PMC3236774?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0028989 https://doaj.org/article/f6bb7d039cb24241b25c7df914209733 |
op_doi |
https://doi.org/10.1371/journal.pone.0028989 |
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PLoS ONE |
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6 |
container_issue |
12 |
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e28989 |
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