Light and productivity of Antarctic phytoplankton during austral summer in an ice edge region in the Weddell-Scotia Sea
21 páginas The photosynthesis-irradiance relationships (P-I curves) of natural plankton samples were studied in the Weddell Sea ice-edge zone, between Elephant Island and South Orkney Islands, during the austral summer of 1988–89. Three water bodies were distinguished in the region: Bellingshausen S...
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Language: | English |
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Oxford University Press
1994
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Online Access: | http://hdl.handle.net/10261/60248 https://doi.org/10.1093/plankt/16.3.233 |
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ftcsic:oai:digital.csic.es:10261/60248 2024-02-11T09:55:57+01:00 Light and productivity of Antarctic phytoplankton during austral summer in an ice edge region in the Weddell-Scotia Sea Figueiras, F. G. Pérez, Fiz F. Pazos, Yolanda Ríos, Aida F. 1994 http://hdl.handle.net/10261/60248 https://doi.org/10.1093/plankt/16.3.233 en eng Oxford University Press http://dx.doi.org/10.1093/plankt/16.3.233 Journal of Plankton Research 16(3): 233-253 (1994) 0142-7873 http://hdl.handle.net/10261/60248 doi:10.1093/plankt/16.3.233 1464-3774 none artículo http://purl.org/coar/resource_type/c_6501 1994 ftcsic https://doi.org/10.1093/plankt/16.3.233 2024-01-16T09:42:28Z 21 páginas The photosynthesis-irradiance relationships (P-I curves) of natural plankton samples were studied in the Weddell Sea ice-edge zone, between Elephant Island and South Orkney Islands, during the austral summer of 1988–89. Three water bodies were distinguished in the region: Bellingshausen Sea waters modified after flowing through Drake Passage and Bransfield Strait, Weddell Sea waters and Weddell Sea waters modified by melting. The stations situated in modified Bellingshausen waters showed a net phytoplankton composition which was different from that of the other two water bodies. Weddell Sea waters and Weddell Sea waters modified by melting of sea ice had the same net phytoplankton composition. In the area of modified Weddell Sea waters, there was an accumulation of phytoplankton in the upper 40 m (>4 mg Chl m−1). pB, and α were independent of depth, but varied between stations. The P-I parameters exhibited an east-west gradient with the maximum values in the Elephant Island region, where large diatoms were absent. The light-saturation parameter Ik averaged 35 ± 13 μmol m−2 s−1. The mean irradiance of the upper mixed layer was 34±13 μmol m−2 s−1, thus virtually equal to Ik. These results are discussed in the context of critical depth (Zc, net compensation irradiance (In) and depth of the upper mixed layer (Zuml). We suggest that the phytoplankton in the region is adapted to maximize its carbon uptake and growth rate at the mean irradiance of the upper mixed layer (Iuml) in well-mixed zones. We also suggest that the light-saturation parameter (Ik) could be the irradiance at which photosynthesis approximately compensates the total losses of the community (In). Peer reviewed Article in Journal/Newspaper Antarc* Antarctic Bellingshausen Sea Bransfield Strait Drake Passage Elephant Island Scotia Sea Sea ice South Orkney Islands Weddell Sea Digital.CSIC (Spanish National Research Council) Antarctic Weddell Sea Austral Drake Passage Scotia Sea Bellingshausen Sea Bransfield Strait Weddell South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Elephant Island ENVELOPE(-55.184,-55.184,-61.085,-61.085) Journal of Plankton Research 16 3 233 253 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
21 páginas The photosynthesis-irradiance relationships (P-I curves) of natural plankton samples were studied in the Weddell Sea ice-edge zone, between Elephant Island and South Orkney Islands, during the austral summer of 1988–89. Three water bodies were distinguished in the region: Bellingshausen Sea waters modified after flowing through Drake Passage and Bransfield Strait, Weddell Sea waters and Weddell Sea waters modified by melting. The stations situated in modified Bellingshausen waters showed a net phytoplankton composition which was different from that of the other two water bodies. Weddell Sea waters and Weddell Sea waters modified by melting of sea ice had the same net phytoplankton composition. In the area of modified Weddell Sea waters, there was an accumulation of phytoplankton in the upper 40 m (>4 mg Chl m−1). pB, and α were independent of depth, but varied between stations. The P-I parameters exhibited an east-west gradient with the maximum values in the Elephant Island region, where large diatoms were absent. The light-saturation parameter Ik averaged 35 ± 13 μmol m−2 s−1. The mean irradiance of the upper mixed layer was 34±13 μmol m−2 s−1, thus virtually equal to Ik. These results are discussed in the context of critical depth (Zc, net compensation irradiance (In) and depth of the upper mixed layer (Zuml). We suggest that the phytoplankton in the region is adapted to maximize its carbon uptake and growth rate at the mean irradiance of the upper mixed layer (Iuml) in well-mixed zones. We also suggest that the light-saturation parameter (Ik) could be the irradiance at which photosynthesis approximately compensates the total losses of the community (In). Peer reviewed |
format |
Article in Journal/Newspaper |
author |
Figueiras, F. G. Pérez, Fiz F. Pazos, Yolanda Ríos, Aida F. |
spellingShingle |
Figueiras, F. G. Pérez, Fiz F. Pazos, Yolanda Ríos, Aida F. Light and productivity of Antarctic phytoplankton during austral summer in an ice edge region in the Weddell-Scotia Sea |
author_facet |
Figueiras, F. G. Pérez, Fiz F. Pazos, Yolanda Ríos, Aida F. |
author_sort |
Figueiras, F. G. |
title |
Light and productivity of Antarctic phytoplankton during austral summer in an ice edge region in the Weddell-Scotia Sea |
title_short |
Light and productivity of Antarctic phytoplankton during austral summer in an ice edge region in the Weddell-Scotia Sea |
title_full |
Light and productivity of Antarctic phytoplankton during austral summer in an ice edge region in the Weddell-Scotia Sea |
title_fullStr |
Light and productivity of Antarctic phytoplankton during austral summer in an ice edge region in the Weddell-Scotia Sea |
title_full_unstemmed |
Light and productivity of Antarctic phytoplankton during austral summer in an ice edge region in the Weddell-Scotia Sea |
title_sort |
light and productivity of antarctic phytoplankton during austral summer in an ice edge region in the weddell-scotia sea |
publisher |
Oxford University Press |
publishDate |
1994 |
url |
http://hdl.handle.net/10261/60248 https://doi.org/10.1093/plankt/16.3.233 |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) ENVELOPE(-55.184,-55.184,-61.085,-61.085) |
geographic |
Antarctic Weddell Sea Austral Drake Passage Scotia Sea Bellingshausen Sea Bransfield Strait Weddell South Orkney Islands Elephant Island |
geographic_facet |
Antarctic Weddell Sea Austral Drake Passage Scotia Sea Bellingshausen Sea Bransfield Strait Weddell South Orkney Islands Elephant Island |
genre |
Antarc* Antarctic Bellingshausen Sea Bransfield Strait Drake Passage Elephant Island Scotia Sea Sea ice South Orkney Islands Weddell Sea |
genre_facet |
Antarc* Antarctic Bellingshausen Sea Bransfield Strait Drake Passage Elephant Island Scotia Sea Sea ice South Orkney Islands Weddell Sea |
op_relation |
http://dx.doi.org/10.1093/plankt/16.3.233 Journal of Plankton Research 16(3): 233-253 (1994) 0142-7873 http://hdl.handle.net/10261/60248 doi:10.1093/plankt/16.3.233 1464-3774 |
op_rights |
none |
op_doi |
https://doi.org/10.1093/plankt/16.3.233 |
container_title |
Journal of Plankton Research |
container_volume |
16 |
container_issue |
3 |
container_start_page |
233 |
op_container_end_page |
253 |
_version_ |
1790599674035437568 |