Eastߞwest gradients in the photosynthetic potential of phytoplankton and iron concentration in the subarctic Pacific Ocean during early summer
In the subarctic Pacific and its adjacent waters, the photochemical quantum yield (F v /F m ) and the functional absorption cross section (Σ PSII ) of photosystem II for surface phytoplankton were continuously measured during the early summer of 1999 using a fast repetition rate fluorometer. Concent...
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crwiley:10.4319/lo.2002.47.6.1581 2024-09-09T20:10:41+00:00 Eastߞwest gradients in the photosynthetic potential of phytoplankton and iron concentration in the subarctic Pacific Ocean during early summer Suzuki, Koji Liu, Hongbin Saino, Toshiro Obata, Hajime Takano, Michiaki Okamura, Kei Sohrin, Yoshiki Fujishima, Yukiyo 2002 http://dx.doi.org/10.4319/lo.2002.47.6.1581 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2002.47.6.1581 https://onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2002.47.6.1581 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2002.47.6.1581 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 47, issue 6, page 1581-1594 ISSN 0024-3590 1939-5590 journal-article 2002 crwiley https://doi.org/10.4319/lo.2002.47.6.1581 2024-08-20T04:12:55Z In the subarctic Pacific and its adjacent waters, the photochemical quantum yield (F v /F m ) and the functional absorption cross section (Σ PSII ) of photosystem II for surface phytoplankton were continuously measured during the early summer of 1999 using a fast repetition rate fluorometer. Concentrations of total dissolvable iron (TD‐Fe) were also determined at each sampling station. The maximum value (0.61) of F v /F m was observed off the Aleutian Peninsula, where TD‐Fe concentrations were relatively high. The Western Subarctic Gyre (WSG) and the Alaskan Gyre (AG), located in the northwest and northeast subarctic Pacific, respectively, were in high‐nutrient, low‐chlorophyll (HNLC) conditions. Surface TD‐Fe generally remained in the WSG but was depleted (<0.01 nmol L −1 ) in the AG. Nighttime F v /F m and Σ PSII in the WSG were significantly higher (p < 0.01) and lower (p < 0.01), respectively, than in the AG. Iron or nitrogen limitations generally lead to a decrease in F v /F m and an increase in Σ PSII . These results suggested that there was an east‐west gradient (WSG . AG) in the photosynthetic competence of phytoplankton in the subarctic Pacific and that the difference was probably caused by iron levels in seawater. Indeed, our iron enrichment experiment in the AG revealed that F v /F m increased from 0.27 to 0.49 and Σ PSII decreased from 496 x 10 −20 to 365 x 10 −20 m 2 photon −1 after a 0.8 nmol L −1 iron addition. At the same time, a dramatic floristic shift from phytoflagellates to diatoms was found by pigment signatures. Iron could principally control the photosynthetic physiology of phytoplankton in the whole subarctic Pacific. Article in Journal/Newspaper Subarctic Wiley Online Library Pacific Limnology and Oceanography 47 6 1581 1594 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
In the subarctic Pacific and its adjacent waters, the photochemical quantum yield (F v /F m ) and the functional absorption cross section (Σ PSII ) of photosystem II for surface phytoplankton were continuously measured during the early summer of 1999 using a fast repetition rate fluorometer. Concentrations of total dissolvable iron (TD‐Fe) were also determined at each sampling station. The maximum value (0.61) of F v /F m was observed off the Aleutian Peninsula, where TD‐Fe concentrations were relatively high. The Western Subarctic Gyre (WSG) and the Alaskan Gyre (AG), located in the northwest and northeast subarctic Pacific, respectively, were in high‐nutrient, low‐chlorophyll (HNLC) conditions. Surface TD‐Fe generally remained in the WSG but was depleted (<0.01 nmol L −1 ) in the AG. Nighttime F v /F m and Σ PSII in the WSG were significantly higher (p < 0.01) and lower (p < 0.01), respectively, than in the AG. Iron or nitrogen limitations generally lead to a decrease in F v /F m and an increase in Σ PSII . These results suggested that there was an east‐west gradient (WSG . AG) in the photosynthetic competence of phytoplankton in the subarctic Pacific and that the difference was probably caused by iron levels in seawater. Indeed, our iron enrichment experiment in the AG revealed that F v /F m increased from 0.27 to 0.49 and Σ PSII decreased from 496 x 10 −20 to 365 x 10 −20 m 2 photon −1 after a 0.8 nmol L −1 iron addition. At the same time, a dramatic floristic shift from phytoflagellates to diatoms was found by pigment signatures. Iron could principally control the photosynthetic physiology of phytoplankton in the whole subarctic Pacific. |
format |
Article in Journal/Newspaper |
author |
Suzuki, Koji Liu, Hongbin Saino, Toshiro Obata, Hajime Takano, Michiaki Okamura, Kei Sohrin, Yoshiki Fujishima, Yukiyo |
spellingShingle |
Suzuki, Koji Liu, Hongbin Saino, Toshiro Obata, Hajime Takano, Michiaki Okamura, Kei Sohrin, Yoshiki Fujishima, Yukiyo Eastߞwest gradients in the photosynthetic potential of phytoplankton and iron concentration in the subarctic Pacific Ocean during early summer |
author_facet |
Suzuki, Koji Liu, Hongbin Saino, Toshiro Obata, Hajime Takano, Michiaki Okamura, Kei Sohrin, Yoshiki Fujishima, Yukiyo |
author_sort |
Suzuki, Koji |
title |
Eastߞwest gradients in the photosynthetic potential of phytoplankton and iron concentration in the subarctic Pacific Ocean during early summer |
title_short |
Eastߞwest gradients in the photosynthetic potential of phytoplankton and iron concentration in the subarctic Pacific Ocean during early summer |
title_full |
Eastߞwest gradients in the photosynthetic potential of phytoplankton and iron concentration in the subarctic Pacific Ocean during early summer |
title_fullStr |
Eastߞwest gradients in the photosynthetic potential of phytoplankton and iron concentration in the subarctic Pacific Ocean during early summer |
title_full_unstemmed |
Eastߞwest gradients in the photosynthetic potential of phytoplankton and iron concentration in the subarctic Pacific Ocean during early summer |
title_sort |
eastߞwest gradients in the photosynthetic potential of phytoplankton and iron concentration in the subarctic pacific ocean during early summer |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.4319/lo.2002.47.6.1581 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2002.47.6.1581 https://onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2002.47.6.1581 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2002.47.6.1581 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Limnology and Oceanography volume 47, issue 6, page 1581-1594 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2002.47.6.1581 |
container_title |
Limnology and Oceanography |
container_volume |
47 |
container_issue |
6 |
container_start_page |
1581 |
op_container_end_page |
1594 |
_version_ |
1809945115736670208 |