Microbial control of phosphate in the nutrient‐depleted North Atlantic subtropical gyre
Summary Little is known about the dynamics of dissolved phosphate in oligotrophic areas of the world's oceans, where concentrations are typically in the nanomolar range. Here, we have budgeted phosphate uptake by the dominant microbial groups in order to assess the effect of the microbial contr...
Published in: | Environmental Microbiology |
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crwiley:10.1111/j.1462-2920.2007.01324.x 2024-09-30T14:39:20+00:00 Microbial control of phosphate in the nutrient‐depleted North Atlantic subtropical gyre Zubkov, Mikhail V. Mary, Isabelle Woodward, E. Malcolm S. Warwick, Phillip E. Fuchs, Bernhard M. Scanlan, David J. Burkill, Peter H. 2007 http://dx.doi.org/10.1111/j.1462-2920.2007.01324.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1462-2920.2007.01324.x http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1462-2920.2007.01324.x/fullpdf en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Environmental Microbiology volume 9, issue 8, page 2079-2089 ISSN 1462-2912 1462-2920 journal-article 2007 crwiley https://doi.org/10.1111/j.1462-2920.2007.01324.x 2024-09-17T04:49:13Z Summary Little is known about the dynamics of dissolved phosphate in oligotrophic areas of the world's oceans, where concentrations are typically in the nanomolar range. Here, we have budgeted phosphate uptake by the dominant microbial groups in order to assess the effect of the microbial control of this depleted nutrient in the North Atlantic gyre. Low concentrations (2.2 ± 1.2 nM) and rapid microbial uptake (2.1 ± 2.4 nM day −1 ) of bioavailable phosphate were repeatedly determined in surface waters of the North Atlantic oligotrophic gyre during spring and autumn research cruises, using a radiotracer dilution bioassay technique. Upper estimates of the concentration of bioavailable phosphate were 7–55% of the dissolved mineral phosphate suggesting that a considerable part of the chemically measured nanomolar phosphate was in a form unavailable for direct microbial uptake. A 1:1 relationship ( r 2 = 0.96, P < 0.0001) was observed between the bioavailable total phosphate uptake and the phosphate uptake of all the flow sorted bacterioplankton cells, demonstrating that bacterioplankton were the main consumers of phosphate. Within the bacterioplankton a group of heterotrophic bacteria and Prochlorococcus phototrophic cyanobacteria, were the two major competing groups for bioavailable phosphate. These heterotrophic bacteria had low nucleic acid content and 60% of them comprised of SAR11 clade cells based on the results of fluorescence in situ hybridization. Each of the two competing bacterial groups was responsible for an average of 45% of the phosphate uptake, while Synechococcus cyanobacteria (7%) and picoplanktonic algae (0.3%) played minor roles in direct phosphate uptake. We have demonstrated that phosphate uptake in the oligotrophic gyre is rapid and dominated by two bacterial groups rather than by algae. Article in Journal/Newspaper North Atlantic Wiley Online Library Environmental Microbiology 9 8 2079 2089 |
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Wiley Online Library |
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crwiley |
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English |
description |
Summary Little is known about the dynamics of dissolved phosphate in oligotrophic areas of the world's oceans, where concentrations are typically in the nanomolar range. Here, we have budgeted phosphate uptake by the dominant microbial groups in order to assess the effect of the microbial control of this depleted nutrient in the North Atlantic gyre. Low concentrations (2.2 ± 1.2 nM) and rapid microbial uptake (2.1 ± 2.4 nM day −1 ) of bioavailable phosphate were repeatedly determined in surface waters of the North Atlantic oligotrophic gyre during spring and autumn research cruises, using a radiotracer dilution bioassay technique. Upper estimates of the concentration of bioavailable phosphate were 7–55% of the dissolved mineral phosphate suggesting that a considerable part of the chemically measured nanomolar phosphate was in a form unavailable for direct microbial uptake. A 1:1 relationship ( r 2 = 0.96, P < 0.0001) was observed between the bioavailable total phosphate uptake and the phosphate uptake of all the flow sorted bacterioplankton cells, demonstrating that bacterioplankton were the main consumers of phosphate. Within the bacterioplankton a group of heterotrophic bacteria and Prochlorococcus phototrophic cyanobacteria, were the two major competing groups for bioavailable phosphate. These heterotrophic bacteria had low nucleic acid content and 60% of them comprised of SAR11 clade cells based on the results of fluorescence in situ hybridization. Each of the two competing bacterial groups was responsible for an average of 45% of the phosphate uptake, while Synechococcus cyanobacteria (7%) and picoplanktonic algae (0.3%) played minor roles in direct phosphate uptake. We have demonstrated that phosphate uptake in the oligotrophic gyre is rapid and dominated by two bacterial groups rather than by algae. |
format |
Article in Journal/Newspaper |
author |
Zubkov, Mikhail V. Mary, Isabelle Woodward, E. Malcolm S. Warwick, Phillip E. Fuchs, Bernhard M. Scanlan, David J. Burkill, Peter H. |
spellingShingle |
Zubkov, Mikhail V. Mary, Isabelle Woodward, E. Malcolm S. Warwick, Phillip E. Fuchs, Bernhard M. Scanlan, David J. Burkill, Peter H. Microbial control of phosphate in the nutrient‐depleted North Atlantic subtropical gyre |
author_facet |
Zubkov, Mikhail V. Mary, Isabelle Woodward, E. Malcolm S. Warwick, Phillip E. Fuchs, Bernhard M. Scanlan, David J. Burkill, Peter H. |
author_sort |
Zubkov, Mikhail V. |
title |
Microbial control of phosphate in the nutrient‐depleted North Atlantic subtropical gyre |
title_short |
Microbial control of phosphate in the nutrient‐depleted North Atlantic subtropical gyre |
title_full |
Microbial control of phosphate in the nutrient‐depleted North Atlantic subtropical gyre |
title_fullStr |
Microbial control of phosphate in the nutrient‐depleted North Atlantic subtropical gyre |
title_full_unstemmed |
Microbial control of phosphate in the nutrient‐depleted North Atlantic subtropical gyre |
title_sort |
microbial control of phosphate in the nutrient‐depleted north atlantic subtropical gyre |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.1462-2920.2007.01324.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1462-2920.2007.01324.x http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1462-2920.2007.01324.x/fullpdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Environmental Microbiology volume 9, issue 8, page 2079-2089 ISSN 1462-2912 1462-2920 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1462-2920.2007.01324.x |
container_title |
Environmental Microbiology |
container_volume |
9 |
container_issue |
8 |
container_start_page |
2079 |
op_container_end_page |
2089 |
_version_ |
1811641934162165760 |