Response of Southern Ocean phytoplankton and bacterioplankton production to short‐term experimental warming
We examined the potential response of Southern Ocean pelagic ecosystems to warming through changes in total primary production (particulate plus dissolved = PPP + DPP) and bacterial production (BP), determined simultaneously at ambient temperature (−1.4 to 0.4°C) and at 2°C in eight experiments perf...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.2006.51.4.1791 2024-09-15T17:47:10+00:00 Response of Southern Ocean phytoplankton and bacterioplankton production to short‐term experimental warming MorÁn, XosÉ Anxelu G. SebastiÁn, Marta Pedrís-Alií, Carlos Estrada, Marta 2006 http://dx.doi.org/10.4319/lo.2006.51.4.1791 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2006.51.4.1791 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2006.51.4.1791 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 51, issue 4, page 1791-1800 ISSN 0024-3590 1939-5590 journal-article 2006 crwiley https://doi.org/10.4319/lo.2006.51.4.1791 2024-08-01T04:22:36Z We examined the potential response of Southern Ocean pelagic ecosystems to warming through changes in total primary production (particulate plus dissolved = PPP + DPP) and bacterial production (BP), determined simultaneously at ambient temperature (−1.4 to 0.4°C) and at 2°C in eight experiments performed near the Antarctic Peninsula in late spring 2002. Short (<6 h) time course experiments of radiocarbon uptake and photosynthesis‐irradiance relationships consistently showed that a significant amount of photosynthate appeared as dissolved substances, with a mean 35% extracellular release (PER). Whereas PPP remained virtually unchanged (0.7 mg C m −3 h −1 ), DPP increased significantly at 2°C from 0.5 to 0.9 mg C m −3 h −1 . The corresponding increase in PER (54% on average) was significantly and positively correlated with the temperature difference among treatments, suggesting that an increase in DPP could be expected with a temperature rise in the Southern Ocean. BP, estimated via [ 3 H]leucine incorporation, tended to increase at 2°C only at low absolute values, and this increment was inversely related to PPP. However, our results show that the estimated bacterial carbon demand (BCD) was generally well below concurrent DPP at both treatments (mean BCD:DPP ratios of 0.60 and 0.27 at ambient temperature and 2°C, respectively), indicating that temperature‐related extra inputs of organic substrates were not fully and immediately processed by bacteria. To the extent that these results reflect general ecophysiological trends, warming of Southern Ocean surface waters could produce changes in plankton‐mediated biogeochemical processes leading to a greater importance of dissolved organic matter fluxes. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Southern Ocean Wiley Online Library Limnology and Oceanography 51 4 1791 1800 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
We examined the potential response of Southern Ocean pelagic ecosystems to warming through changes in total primary production (particulate plus dissolved = PPP + DPP) and bacterial production (BP), determined simultaneously at ambient temperature (−1.4 to 0.4°C) and at 2°C in eight experiments performed near the Antarctic Peninsula in late spring 2002. Short (<6 h) time course experiments of radiocarbon uptake and photosynthesis‐irradiance relationships consistently showed that a significant amount of photosynthate appeared as dissolved substances, with a mean 35% extracellular release (PER). Whereas PPP remained virtually unchanged (0.7 mg C m −3 h −1 ), DPP increased significantly at 2°C from 0.5 to 0.9 mg C m −3 h −1 . The corresponding increase in PER (54% on average) was significantly and positively correlated with the temperature difference among treatments, suggesting that an increase in DPP could be expected with a temperature rise in the Southern Ocean. BP, estimated via [ 3 H]leucine incorporation, tended to increase at 2°C only at low absolute values, and this increment was inversely related to PPP. However, our results show that the estimated bacterial carbon demand (BCD) was generally well below concurrent DPP at both treatments (mean BCD:DPP ratios of 0.60 and 0.27 at ambient temperature and 2°C, respectively), indicating that temperature‐related extra inputs of organic substrates were not fully and immediately processed by bacteria. To the extent that these results reflect general ecophysiological trends, warming of Southern Ocean surface waters could produce changes in plankton‐mediated biogeochemical processes leading to a greater importance of dissolved organic matter fluxes. |
format |
Article in Journal/Newspaper |
author |
MorÁn, XosÉ Anxelu G. SebastiÁn, Marta Pedrís-Alií, Carlos Estrada, Marta |
spellingShingle |
MorÁn, XosÉ Anxelu G. SebastiÁn, Marta Pedrís-Alií, Carlos Estrada, Marta Response of Southern Ocean phytoplankton and bacterioplankton production to short‐term experimental warming |
author_facet |
MorÁn, XosÉ Anxelu G. SebastiÁn, Marta Pedrís-Alií, Carlos Estrada, Marta |
author_sort |
MorÁn, XosÉ Anxelu G. |
title |
Response of Southern Ocean phytoplankton and bacterioplankton production to short‐term experimental warming |
title_short |
Response of Southern Ocean phytoplankton and bacterioplankton production to short‐term experimental warming |
title_full |
Response of Southern Ocean phytoplankton and bacterioplankton production to short‐term experimental warming |
title_fullStr |
Response of Southern Ocean phytoplankton and bacterioplankton production to short‐term experimental warming |
title_full_unstemmed |
Response of Southern Ocean phytoplankton and bacterioplankton production to short‐term experimental warming |
title_sort |
response of southern ocean phytoplankton and bacterioplankton production to short‐term experimental warming |
publisher |
Wiley |
publishDate |
2006 |
url |
http://dx.doi.org/10.4319/lo.2006.51.4.1791 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2006.51.4.1791 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2006.51.4.1791 |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
op_source |
Limnology and Oceanography volume 51, issue 4, page 1791-1800 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2006.51.4.1791 |
container_title |
Limnology and Oceanography |
container_volume |
51 |
container_issue |
4 |
container_start_page |
1791 |
op_container_end_page |
1800 |
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1810495973407850496 |