Phytoplankton community response to Fe and temperature gradients in the NE (SERIES) and NW (SEEDS) subarctic Pacific Ocean
Ship-board iron enrichment bottle experiments were carried out with samples collected at the mesoscale iron fertilization experimental site (SERIES) in the subarctic NE Pacific in the summer of 2002. Samples were collected on Day 14 of the experiment outside the patch that was in a typical high nitr...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier Ltd
|
Subjects: | |
Online Access: | http://hdl.handle.net/2115/17202 https://doi.org/10.1016/j.dsr2.2006.05.033 |
id |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/17202 |
---|---|
record_format |
openpolar |
spelling |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/17202 2023-05-15T18:28:06+02:00 Phytoplankton community response to Fe and temperature gradients in the NE (SERIES) and NW (SEEDS) subarctic Pacific Ocean Kudo, Isao Noiri, Yoshifumi Nishioka, Jun Taira, Yousuke Kiyosawa, Hiroshi Tsuda, Atsushi http://hdl.handle.net/2115/17202 https://doi.org/10.1016/j.dsr2.2006.05.033 eng eng Elsevier Ltd http://www.sciencedirect.com/science/journal/09670645 http://hdl.handle.net/2115/17202 Deep Sea Research Part II Topical Studies in Oceanography, 53(20-22): 2201-2213 http://dx.doi.org/10.1016/j.dsr2.2006.05.033 Fe concentration Diatoms Nutrients Subarctic Pacific Ocean Phytoplankton size fraction Temperature 452 article (author version) fthokunivhus https://doi.org/10.1016/j.dsr2.2006.05.033 2022-11-18T01:01:23Z Ship-board iron enrichment bottle experiments were carried out with samples collected at the mesoscale iron fertilization experimental site (SERIES) in the subarctic NE Pacific in the summer of 2002. Samples were collected on Day 14 of the experiment outside the patch that was in a typical high nitrate and low chlorophyll (HNLC) condition. The iron concentration in the incubation bottles ranged from 0.1 to 2.0 nM by adding FeCl3 solution. The increase in chlorophyll-a (chl-a) in the micro (>10 μm) and nano-sized (2–10 μm) fraction was observed as a function of the added iron. Chl-a in the pico-sized fraction (0.7–2 μm) showed no increase with time. Nitrate and silicate were exhausted in the Fe-amended bottles, while those in the control bottle remained at the end of incubation. The relative consumption ratio of silicate to nitrate for the control bottles was significantly higher than that for the Fe-amended bottles. As a hyperbolic relation was found between iron concentration and the rate of increase in Chl-a (specific growth rate) for the micro and nano-sized fraction, the Monod equation was fit to obtain a maximum growth rate (μmax) and a half-saturation constant for iron (KFe). The μmax values were 0.72 and 0.48 d−1 for the micro and nano-sized fraction, respectively. The KFe values were 0.10 and 0.08 nM for the micro and nano-sized fraction, respectively. The μmax agreed with the rate of increase in Chl-a observed in situ for the mesoscale iron fertilization experiment. The μmax value for micro-sized fraction at 12 °C was half of that in the western subarctic Pacific Ocean (SEEDS experiment in 2001), indicating the Chl-a increase rate (potential growth rate) after iron enrichment was much higher in SEEDS than that in SERIES. The KFe values were much lower than that in SEEDS, suggesting that the phytoplankton community in the NE subarctic Pacific Ocean acclimates to a lower ambient Fe concentration. This difference in KFe between SERIES (NE) and SEEDS (NW) may reflect the previously suggested gradient in ... Article in Journal/Newspaper Subarctic Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Pacific Deep Sea Research Part II: Topical Studies in Oceanography 53 20-22 2201 2213 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Fe concentration Diatoms Nutrients Subarctic Pacific Ocean Phytoplankton size fraction Temperature 452 |
spellingShingle |
Fe concentration Diatoms Nutrients Subarctic Pacific Ocean Phytoplankton size fraction Temperature 452 Kudo, Isao Noiri, Yoshifumi Nishioka, Jun Taira, Yousuke Kiyosawa, Hiroshi Tsuda, Atsushi Phytoplankton community response to Fe and temperature gradients in the NE (SERIES) and NW (SEEDS) subarctic Pacific Ocean |
topic_facet |
Fe concentration Diatoms Nutrients Subarctic Pacific Ocean Phytoplankton size fraction Temperature 452 |
description |
Ship-board iron enrichment bottle experiments were carried out with samples collected at the mesoscale iron fertilization experimental site (SERIES) in the subarctic NE Pacific in the summer of 2002. Samples were collected on Day 14 of the experiment outside the patch that was in a typical high nitrate and low chlorophyll (HNLC) condition. The iron concentration in the incubation bottles ranged from 0.1 to 2.0 nM by adding FeCl3 solution. The increase in chlorophyll-a (chl-a) in the micro (>10 μm) and nano-sized (2–10 μm) fraction was observed as a function of the added iron. Chl-a in the pico-sized fraction (0.7–2 μm) showed no increase with time. Nitrate and silicate were exhausted in the Fe-amended bottles, while those in the control bottle remained at the end of incubation. The relative consumption ratio of silicate to nitrate for the control bottles was significantly higher than that for the Fe-amended bottles. As a hyperbolic relation was found between iron concentration and the rate of increase in Chl-a (specific growth rate) for the micro and nano-sized fraction, the Monod equation was fit to obtain a maximum growth rate (μmax) and a half-saturation constant for iron (KFe). The μmax values were 0.72 and 0.48 d−1 for the micro and nano-sized fraction, respectively. The KFe values were 0.10 and 0.08 nM for the micro and nano-sized fraction, respectively. The μmax agreed with the rate of increase in Chl-a observed in situ for the mesoscale iron fertilization experiment. The μmax value for micro-sized fraction at 12 °C was half of that in the western subarctic Pacific Ocean (SEEDS experiment in 2001), indicating the Chl-a increase rate (potential growth rate) after iron enrichment was much higher in SEEDS than that in SERIES. The KFe values were much lower than that in SEEDS, suggesting that the phytoplankton community in the NE subarctic Pacific Ocean acclimates to a lower ambient Fe concentration. This difference in KFe between SERIES (NE) and SEEDS (NW) may reflect the previously suggested gradient in ... |
format |
Article in Journal/Newspaper |
author |
Kudo, Isao Noiri, Yoshifumi Nishioka, Jun Taira, Yousuke Kiyosawa, Hiroshi Tsuda, Atsushi |
author_facet |
Kudo, Isao Noiri, Yoshifumi Nishioka, Jun Taira, Yousuke Kiyosawa, Hiroshi Tsuda, Atsushi |
author_sort |
Kudo, Isao |
title |
Phytoplankton community response to Fe and temperature gradients in the NE (SERIES) and NW (SEEDS) subarctic Pacific Ocean |
title_short |
Phytoplankton community response to Fe and temperature gradients in the NE (SERIES) and NW (SEEDS) subarctic Pacific Ocean |
title_full |
Phytoplankton community response to Fe and temperature gradients in the NE (SERIES) and NW (SEEDS) subarctic Pacific Ocean |
title_fullStr |
Phytoplankton community response to Fe and temperature gradients in the NE (SERIES) and NW (SEEDS) subarctic Pacific Ocean |
title_full_unstemmed |
Phytoplankton community response to Fe and temperature gradients in the NE (SERIES) and NW (SEEDS) subarctic Pacific Ocean |
title_sort |
phytoplankton community response to fe and temperature gradients in the ne (series) and nw (seeds) subarctic pacific ocean |
publisher |
Elsevier Ltd |
url |
http://hdl.handle.net/2115/17202 https://doi.org/10.1016/j.dsr2.2006.05.033 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
http://www.sciencedirect.com/science/journal/09670645 http://hdl.handle.net/2115/17202 Deep Sea Research Part II Topical Studies in Oceanography, 53(20-22): 2201-2213 http://dx.doi.org/10.1016/j.dsr2.2006.05.033 |
op_doi |
https://doi.org/10.1016/j.dsr2.2006.05.033 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
53 |
container_issue |
20-22 |
container_start_page |
2201 |
op_container_end_page |
2213 |
_version_ |
1766210438651969536 |