Nitrogen uptake regime and phytoplankton community structure in the Atlantic and Indian sectors of the Southern Ocean
Phytoplankton nitrogen uptake is studied in relation to the biomass and structure of phytoplankton community in the Atlantic and Indian sectors of the Southern Ocean. Two scenarios of seasonal evolution of uptake regime and phytoplankton community structure are described. The first scenario includes...
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Elsevier science bv
1998
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ftunivleuven:oai:lirias.kuleuven.be:123456789/45639 2023-05-15T14:03:27+02:00 Nitrogen uptake regime and phytoplankton community structure in the Atlantic and Indian sectors of the Southern Ocean Semeneh, M Dehairs, F Elskens, M Baumann, MEM Kopczynska, EE Lancelot, C Goeyens, Leo 1998 https://lirias.kuleuven.be/handle/123456789/45639 http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=CCC&SrcApp=PRODUCT_NAME&SrcURL=WOS_RETURN_URL&CKEY=SEME0159980017JM&DestLinkType=FullRecord&DestApp=CCC&SrcDesc=RETURN_ALT_TEXT&SrcAppSID=APP_SID en eng Elsevier science bv Journal of marine systems vol:17 issue:1-4 pages:159-177 https://lirias.kuleuven.be/handle/123456789/45639 0924-7963 http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=CCC&SrcApp=PRODUCT_NAME&SrcURL=WOS_RETURN_URL&CKEY=SEME0159980017JM&DestLinkType=FullRecord&DestApp=CCC&SrcDesc=RETURN_ALT_TEXT&SrcAppSID=APP_SID nitrogen uptake phytoplankton community structure southern ocean seasonal variability weddell confluence area marginal ice-zone antarctic ocean ross sea austral summer scotia sea edge zone ammonium biomass autumn Description (Metadata) only IT article 1998 ftunivleuven 2016-01-24T21:02:31Z Phytoplankton nitrogen uptake is studied in relation to the biomass and structure of phytoplankton community in the Atlantic and Indian sectors of the Southern Ocean. Two scenarios of seasonal evolution of uptake regime and phytoplankton community structure are described. The first scenario includes the Marginal Ice Zone areas of the Weddell Sea and adjacent areas where a predominantly nitrate based, diatom dominated assemblage, thriving in a stable water column at the beginning of the season was transformed into a mainly ammonium based, flagellate dominated assemblage, towards the end of the season. The change in phytoplankton community structure was caused by selective grazing by large grazers and reduced stability of the water column and the shift in uptake regime was due to increased ammonium availability and changes in community structure. In the second scenario, in the Coastal and Continental Shelf Zone (CCSZ) and Open Oceanic Zone (OOZ) of the Indian sector, a shift in uptake regime occurred without a big change in phytoplankton community structure. These areas were sampled late in the growth season and were characterized by prolonged water column stability, less grazing pressure on large diatoms and high ammonium availability. Diatoms dominated the assemblage and about 80% phytoplankton biomass was on the > 10 mu m size fraction. Unlike the first scenario, diatoms were largely based on ammonium. Thus, in areas of persistent water column stability and less selective grazing pressure, a shift in uptake regime can occur without change in community structure. The dominance of diatoms under regenerated production provides a physiological evidence for the excess net removal of silicate over nitrate occurring in certain provinces of the Southern Ocean. status: published Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Ross Sea Scotia Sea Southern Ocean Weddell Sea KU Leuven: Lirias Antarctic Southern Ocean Weddell Sea Austral Ross Sea Scotia Sea Indian Weddell Antarctic Ocean |
institution |
Open Polar |
collection |
KU Leuven: Lirias |
op_collection_id |
ftunivleuven |
language |
English |
topic |
nitrogen uptake phytoplankton community structure southern ocean seasonal variability weddell confluence area marginal ice-zone antarctic ocean ross sea austral summer scotia sea edge zone ammonium biomass autumn |
spellingShingle |
nitrogen uptake phytoplankton community structure southern ocean seasonal variability weddell confluence area marginal ice-zone antarctic ocean ross sea austral summer scotia sea edge zone ammonium biomass autumn Semeneh, M Dehairs, F Elskens, M Baumann, MEM Kopczynska, EE Lancelot, C Goeyens, Leo Nitrogen uptake regime and phytoplankton community structure in the Atlantic and Indian sectors of the Southern Ocean |
topic_facet |
nitrogen uptake phytoplankton community structure southern ocean seasonal variability weddell confluence area marginal ice-zone antarctic ocean ross sea austral summer scotia sea edge zone ammonium biomass autumn |
description |
Phytoplankton nitrogen uptake is studied in relation to the biomass and structure of phytoplankton community in the Atlantic and Indian sectors of the Southern Ocean. Two scenarios of seasonal evolution of uptake regime and phytoplankton community structure are described. The first scenario includes the Marginal Ice Zone areas of the Weddell Sea and adjacent areas where a predominantly nitrate based, diatom dominated assemblage, thriving in a stable water column at the beginning of the season was transformed into a mainly ammonium based, flagellate dominated assemblage, towards the end of the season. The change in phytoplankton community structure was caused by selective grazing by large grazers and reduced stability of the water column and the shift in uptake regime was due to increased ammonium availability and changes in community structure. In the second scenario, in the Coastal and Continental Shelf Zone (CCSZ) and Open Oceanic Zone (OOZ) of the Indian sector, a shift in uptake regime occurred without a big change in phytoplankton community structure. These areas were sampled late in the growth season and were characterized by prolonged water column stability, less grazing pressure on large diatoms and high ammonium availability. Diatoms dominated the assemblage and about 80% phytoplankton biomass was on the > 10 mu m size fraction. Unlike the first scenario, diatoms were largely based on ammonium. Thus, in areas of persistent water column stability and less selective grazing pressure, a shift in uptake regime can occur without change in community structure. The dominance of diatoms under regenerated production provides a physiological evidence for the excess net removal of silicate over nitrate occurring in certain provinces of the Southern Ocean. status: published |
format |
Article in Journal/Newspaper |
author |
Semeneh, M Dehairs, F Elskens, M Baumann, MEM Kopczynska, EE Lancelot, C Goeyens, Leo |
author_facet |
Semeneh, M Dehairs, F Elskens, M Baumann, MEM Kopczynska, EE Lancelot, C Goeyens, Leo |
author_sort |
Semeneh, M |
title |
Nitrogen uptake regime and phytoplankton community structure in the Atlantic and Indian sectors of the Southern Ocean |
title_short |
Nitrogen uptake regime and phytoplankton community structure in the Atlantic and Indian sectors of the Southern Ocean |
title_full |
Nitrogen uptake regime and phytoplankton community structure in the Atlantic and Indian sectors of the Southern Ocean |
title_fullStr |
Nitrogen uptake regime and phytoplankton community structure in the Atlantic and Indian sectors of the Southern Ocean |
title_full_unstemmed |
Nitrogen uptake regime and phytoplankton community structure in the Atlantic and Indian sectors of the Southern Ocean |
title_sort |
nitrogen uptake regime and phytoplankton community structure in the atlantic and indian sectors of the southern ocean |
publisher |
Elsevier science bv |
publishDate |
1998 |
url |
https://lirias.kuleuven.be/handle/123456789/45639 http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=CCC&SrcApp=PRODUCT_NAME&SrcURL=WOS_RETURN_URL&CKEY=SEME0159980017JM&DestLinkType=FullRecord&DestApp=CCC&SrcDesc=RETURN_ALT_TEXT&SrcAppSID=APP_SID |
geographic |
Antarctic Southern Ocean Weddell Sea Austral Ross Sea Scotia Sea Indian Weddell Antarctic Ocean |
geographic_facet |
Antarctic Southern Ocean Weddell Sea Austral Ross Sea Scotia Sea Indian Weddell Antarctic Ocean |
genre |
Antarc* Antarctic Antarctic Ocean Ross Sea Scotia Sea Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Ocean Ross Sea Scotia Sea Southern Ocean Weddell Sea |
op_relation |
Journal of marine systems vol:17 issue:1-4 pages:159-177 https://lirias.kuleuven.be/handle/123456789/45639 0924-7963 http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=CCC&SrcApp=PRODUCT_NAME&SrcURL=WOS_RETURN_URL&CKEY=SEME0159980017JM&DestLinkType=FullRecord&DestApp=CCC&SrcDesc=RETURN_ALT_TEXT&SrcAppSID=APP_SID |
_version_ |
1766274113217757184 |