Synergistic effects of p CO 2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community
Little is known concerning the effect of CO 2 on phytoplankton ecophysiological processes under nutrient and trace element-limited conditions, because most CO 2 manipulation experiments have been conducted under elements-replete conditions. To investigate the effects of CO 2 and iron availability on...
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ftdoajarticles:oai:doaj.org/article:274d045f2d364f1f927dc9994d0935d6 2023-05-15T15:43:39+02:00 Synergistic effects of p CO 2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community K. Sugie H. Endo K. Suzuki J. Nishioka H. Kiyosawa T. Yoshimura 2013-10-01T00:00:00Z https://doi.org/10.5194/bg-10-6309-2013 https://doaj.org/article/274d045f2d364f1f927dc9994d0935d6 EN eng Copernicus Publications http://www.biogeosciences.net/10/6309/2013/bg-10-6309-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-6309-2013 1726-4170 1726-4189 https://doaj.org/article/274d045f2d364f1f927dc9994d0935d6 Biogeosciences, Vol 10, Iss 10, Pp 6309-6321 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-6309-2013 2022-12-31T12:31:40Z Little is known concerning the effect of CO 2 on phytoplankton ecophysiological processes under nutrient and trace element-limited conditions, because most CO 2 manipulation experiments have been conducted under elements-replete conditions. To investigate the effects of CO 2 and iron availability on phytoplankton ecophysiology, we conducted an experiment in September 2009 using a phytoplankton community in the iron limited, high-nutrient, low-chlorophyll (HNLC) region of the Bering Sea basin . Carbonate chemistry was controlled by the bubbling of the several levels of CO 2 concentration (180, 380, 600, and 1000 ppm) controlled air, and two iron conditions were established, one with and one without the addition of inorganic iron. We demonstrated that in the iron-limited control conditions, the specific growth rate and the maximum photochemical quantum efficiency ( F v / F m ) of photosystem (PS) II decreased with increasing CO 2 levels, suggesting a further decrease in iron bioavailability under the high-CO 2 conditions. In addition, biogenic silica to particulate nitrogen and biogenic silica to particulate organic carbon ratios increased from 2.65 to 3.75 and 0.39 to 0.50, respectively, with an increase in the CO 2 level in the iron-limited controls. By contrast, the specific growth rate, F v / F m values and elemental compositions in the iron-added treatments did not change in response to the CO 2 variations, indicating that the addition of iron canceled out the effect of the modulation of iron bioavailability due to the change in carbonate chemistry. Our results suggest that high-CO 2 conditions can alter the biogeochemical cycling of nutrients through decreasing iron bioavailability in the iron-limited HNLC regions in the future. Article in Journal/Newspaper Bering Sea Directory of Open Access Journals: DOAJ Articles Bering Sea Biogeosciences 10 10 6309 6321 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 K. Sugie H. Endo K. Suzuki J. Nishioka H. Kiyosawa T. Yoshimura Synergistic effects of p CO 2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Little is known concerning the effect of CO 2 on phytoplankton ecophysiological processes under nutrient and trace element-limited conditions, because most CO 2 manipulation experiments have been conducted under elements-replete conditions. To investigate the effects of CO 2 and iron availability on phytoplankton ecophysiology, we conducted an experiment in September 2009 using a phytoplankton community in the iron limited, high-nutrient, low-chlorophyll (HNLC) region of the Bering Sea basin . Carbonate chemistry was controlled by the bubbling of the several levels of CO 2 concentration (180, 380, 600, and 1000 ppm) controlled air, and two iron conditions were established, one with and one without the addition of inorganic iron. We demonstrated that in the iron-limited control conditions, the specific growth rate and the maximum photochemical quantum efficiency ( F v / F m ) of photosystem (PS) II decreased with increasing CO 2 levels, suggesting a further decrease in iron bioavailability under the high-CO 2 conditions. In addition, biogenic silica to particulate nitrogen and biogenic silica to particulate organic carbon ratios increased from 2.65 to 3.75 and 0.39 to 0.50, respectively, with an increase in the CO 2 level in the iron-limited controls. By contrast, the specific growth rate, F v / F m values and elemental compositions in the iron-added treatments did not change in response to the CO 2 variations, indicating that the addition of iron canceled out the effect of the modulation of iron bioavailability due to the change in carbonate chemistry. Our results suggest that high-CO 2 conditions can alter the biogeochemical cycling of nutrients through decreasing iron bioavailability in the iron-limited HNLC regions in the future. |
format |
Article in Journal/Newspaper |
author |
K. Sugie H. Endo K. Suzuki J. Nishioka H. Kiyosawa T. Yoshimura |
author_facet |
K. Sugie H. Endo K. Suzuki J. Nishioka H. Kiyosawa T. Yoshimura |
author_sort |
K. Sugie |
title |
Synergistic effects of p CO 2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community |
title_short |
Synergistic effects of p CO 2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community |
title_full |
Synergistic effects of p CO 2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community |
title_fullStr |
Synergistic effects of p CO 2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community |
title_full_unstemmed |
Synergistic effects of p CO 2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community |
title_sort |
synergistic effects of p co 2 and iron availability on nutrient consumption ratio of the bering sea phytoplankton community |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-6309-2013 https://doaj.org/article/274d045f2d364f1f927dc9994d0935d6 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_source |
Biogeosciences, Vol 10, Iss 10, Pp 6309-6321 (2013) |
op_relation |
http://www.biogeosciences.net/10/6309/2013/bg-10-6309-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-6309-2013 1726-4170 1726-4189 https://doaj.org/article/274d045f2d364f1f927dc9994d0935d6 |
op_doi |
https://doi.org/10.5194/bg-10-6309-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
10 |
container_start_page |
6309 |
op_container_end_page |
6321 |
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1766377830337216512 |