Ammonium regeneration in the scotia-weddell confluence area during spring 1988
The presence of large ammonium stocks and the related enhanced quantities of microheterotrophs in the Scotia-Weddell Confluence area indicate the importance of ammonium remineralization processes there. Maximal ammonium concentrations in the marginal ice zone amounted to more than 2-mu-mol N l-1 and...
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1991
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ftunivleuven:oai:lirias.kuleuven.be:123456789/47512 2023-05-15T13:58:22+02:00 Ammonium regeneration in the scotia-weddell confluence area during spring 1988 Goeyens, Leo Treguer, P Lancelot, C Mathot, S Becquevort, S Morvan, J Dehairs, F Baeyens, W 1991 https://lirias.kuleuven.be/handle/123456789/47512 en eng Inter-research Marine ecology-progress series vol:78 issue:3 pages:241-252 https://lirias.kuleuven.be/handle/123456789/47512 0171-8630 indian-ocean sector antarctic waters southern-ocean ross sea marine-bacteria surface waters austral summer n-15 uptake ice edge phytoplankton Description (Metadata) only IT article 1991 ftunivleuven 2015-12-22T15:05:11Z The presence of large ammonium stocks and the related enhanced quantities of microheterotrophs in the Scotia-Weddell Confluence area indicate the importance of ammonium remineralization processes there. Maximal ammonium concentrations in the marginal ice zone amounted to more than 2-mu-mol N l-1 and remineralization rates in this zone were consistently higher than those measured in the adjacent open ocean and permanently ice-covered zones. At one station, characterized by a large kill swarm, the remineralization rate was 18 nmol N l-1 h-1; rates in the marginal ice zone generally ranged between 5 and 9 nmol N l-1 h-1. Protozoan activity was of predominant importance for the remineralization process; only after the krill event was a very high bacterial activity observed. The presence of krill does not contribute in a direct way to the ammonium pool, but probably initiates the bacterial breakdown activity in algal debris and faecal pellets. The increased remineralization leads to enhanced availability of ammonium in the water and to decreased f-ratios for phytoplanktonic nitrate assimilation. Nevertheless, nitrate uptake represented at least 30% of inorganic nitrogen assimilation, significantly higher than values measured for oligotrophic systems. status: published Article in Journal/Newspaper Antarc* Antarctic Ross Sea Southern Ocean KU Leuven: Lirias Antarctic Southern Ocean Austral Ross Sea Indian Weddell |
institution |
Open Polar |
collection |
KU Leuven: Lirias |
op_collection_id |
ftunivleuven |
language |
English |
topic |
indian-ocean sector antarctic waters southern-ocean ross sea marine-bacteria surface waters austral summer n-15 uptake ice edge phytoplankton |
spellingShingle |
indian-ocean sector antarctic waters southern-ocean ross sea marine-bacteria surface waters austral summer n-15 uptake ice edge phytoplankton Goeyens, Leo Treguer, P Lancelot, C Mathot, S Becquevort, S Morvan, J Dehairs, F Baeyens, W Ammonium regeneration in the scotia-weddell confluence area during spring 1988 |
topic_facet |
indian-ocean sector antarctic waters southern-ocean ross sea marine-bacteria surface waters austral summer n-15 uptake ice edge phytoplankton |
description |
The presence of large ammonium stocks and the related enhanced quantities of microheterotrophs in the Scotia-Weddell Confluence area indicate the importance of ammonium remineralization processes there. Maximal ammonium concentrations in the marginal ice zone amounted to more than 2-mu-mol N l-1 and remineralization rates in this zone were consistently higher than those measured in the adjacent open ocean and permanently ice-covered zones. At one station, characterized by a large kill swarm, the remineralization rate was 18 nmol N l-1 h-1; rates in the marginal ice zone generally ranged between 5 and 9 nmol N l-1 h-1. Protozoan activity was of predominant importance for the remineralization process; only after the krill event was a very high bacterial activity observed. The presence of krill does not contribute in a direct way to the ammonium pool, but probably initiates the bacterial breakdown activity in algal debris and faecal pellets. The increased remineralization leads to enhanced availability of ammonium in the water and to decreased f-ratios for phytoplanktonic nitrate assimilation. Nevertheless, nitrate uptake represented at least 30% of inorganic nitrogen assimilation, significantly higher than values measured for oligotrophic systems. status: published |
format |
Article in Journal/Newspaper |
author |
Goeyens, Leo Treguer, P Lancelot, C Mathot, S Becquevort, S Morvan, J Dehairs, F Baeyens, W |
author_facet |
Goeyens, Leo Treguer, P Lancelot, C Mathot, S Becquevort, S Morvan, J Dehairs, F Baeyens, W |
author_sort |
Goeyens, Leo |
title |
Ammonium regeneration in the scotia-weddell confluence area during spring 1988 |
title_short |
Ammonium regeneration in the scotia-weddell confluence area during spring 1988 |
title_full |
Ammonium regeneration in the scotia-weddell confluence area during spring 1988 |
title_fullStr |
Ammonium regeneration in the scotia-weddell confluence area during spring 1988 |
title_full_unstemmed |
Ammonium regeneration in the scotia-weddell confluence area during spring 1988 |
title_sort |
ammonium regeneration in the scotia-weddell confluence area during spring 1988 |
publisher |
Inter-research |
publishDate |
1991 |
url |
https://lirias.kuleuven.be/handle/123456789/47512 |
geographic |
Antarctic Southern Ocean Austral Ross Sea Indian Weddell |
geographic_facet |
Antarctic Southern Ocean Austral Ross Sea Indian Weddell |
genre |
Antarc* Antarctic Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Ross Sea Southern Ocean |
op_relation |
Marine ecology-progress series vol:78 issue:3 pages:241-252 https://lirias.kuleuven.be/handle/123456789/47512 0171-8630 |
_version_ |
1766266593474510848 |