Phytoplanktonic nutrient utilisation and nutrient signature in the Southern Ocean
The separation in Southern Ocean provinces of silicate excess at nitrate exhaustion and of nitrate excess at silicate exhaustion was already introduced by Kamykowski and Zentara (Kamykowski, D., Zentara, S.J., 1985. Nitrate and silicic acid in the world ocean: patterns and processes. Mar. Ecol. Frog...
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1998
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ftunivleuven:oai:lirias.kuleuven.be:123456789/45640 2023-05-15T14:03:27+02:00 Phytoplanktonic nutrient utilisation and nutrient signature in the Southern Ocean Goeyens, Leo Semeneh, M Baumann, MEM Elskens, M Shopova, D Dehairs, F 1998 https://lirias.kuleuven.be/handle/123456789/45640 http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=CCC&SrcApp=PRODUCT_NAME&SrcURL=WOS_RETURN_URL&CKEY=GOEY0143980017JL&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:143-157 https://lirias.kuleuven.be/handle/123456789/45640 0924-7963 http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=CCC&SrcApp=PRODUCT_NAME&SrcURL=WOS_RETURN_URL&CKEY=GOEY0143980017JL&DestLinkType=FullRecord&DestApp=CCC&SrcDesc=RETURN_ALT_TEXT&SrcAppSID=APP_SID southern ocean silicate excess area nitrate excess area nitrate uptake rate f-ratio marginal ice-zone primary productivity antarctic ocean nitrogen uptake nitrate uptake weddell sea indian sector uptake rates late summer scotia sea Description (Metadata) only IT article 1998 ftunivleuven 2016-01-24T21:02:31Z The separation in Southern Ocean provinces of silicate excess at nitrate exhaustion and of nitrate excess at silicate exhaustion was already introduced by Kamykowski and Zentara (Kamykowski, D., Zentara, S.J., 1985. Nitrate and silicic acid in the world ocean: patterns and processes. Mar. Ecol. Frog. Ser. 26, 47-59; and Kamykowski, D., Zentara, S.J., 1989. Circumpolar plant nutrient covariation in the Southern Ocean: patterns and processes. Mar. Ecol. Frog. Ser. 58, 101-111) and our investigations of the silicate to nitrate uptake ratios confirm the earlier distinction. Oligotrophic antarctic waters mainly exhibit proportionally higher silicate removal what induces a potential for nitrate excess. The nitrogen uptake regime of such areas is characterised by low absolute as well as specific nitrate uptake rates throughout. Maximal values did not exceed 0.15 mu M d(-1) and 0.005 h(-1), respectively. Corresponding f-ratios ranged from 0.39 to 0.86. This scenario contrasts strikingly to the more fertile ice edge areas. They showed a drastic but short vernal increase in nitrate uptake. Absolute uptake rates reached a maximum value of 2.18 mu M d(-1) whereas the maximal specific uptake rate was 0.063 h(-1). In addition to an optimal physical environment for bloom development, accumulation of ammonium stimulated nitrate uptake in a direct or indirect way. Since ammonium build-up in surface waters traces enhanced remineralisation, release of other essential compounds during degradation of organic matter might have been the main trigger. This peak nitrate utilisation during early spring led to the observed potential for silicate excess. With increasing seasonal maturity the nitrate uptake became inhibited by the presence of enhanced ammonium availability (up to 8% of the inorganic nitrogen pool), however, and after a short period of intensive nitrate consumption the uptake rates drop to very low levels, which are comparable to the ones observed in the area of nitrate excess at silicate exhaustion. status: published Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Scotia Sea Southern Ocean Weddell Sea KU Leuven: Lirias Antarctic Southern Ocean Weddell Sea Scotia Sea Indian Weddell Antarctic Ocean |
institution |
Open Polar |
collection |
KU Leuven: Lirias |
op_collection_id |
ftunivleuven |
language |
English |
topic |
southern ocean silicate excess area nitrate excess area nitrate uptake rate f-ratio marginal ice-zone primary productivity antarctic ocean nitrogen uptake nitrate uptake weddell sea indian sector uptake rates late summer scotia sea |
spellingShingle |
southern ocean silicate excess area nitrate excess area nitrate uptake rate f-ratio marginal ice-zone primary productivity antarctic ocean nitrogen uptake nitrate uptake weddell sea indian sector uptake rates late summer scotia sea Goeyens, Leo Semeneh, M Baumann, MEM Elskens, M Shopova, D Dehairs, F Phytoplanktonic nutrient utilisation and nutrient signature in the Southern Ocean |
topic_facet |
southern ocean silicate excess area nitrate excess area nitrate uptake rate f-ratio marginal ice-zone primary productivity antarctic ocean nitrogen uptake nitrate uptake weddell sea indian sector uptake rates late summer scotia sea |
description |
The separation in Southern Ocean provinces of silicate excess at nitrate exhaustion and of nitrate excess at silicate exhaustion was already introduced by Kamykowski and Zentara (Kamykowski, D., Zentara, S.J., 1985. Nitrate and silicic acid in the world ocean: patterns and processes. Mar. Ecol. Frog. Ser. 26, 47-59; and Kamykowski, D., Zentara, S.J., 1989. Circumpolar plant nutrient covariation in the Southern Ocean: patterns and processes. Mar. Ecol. Frog. Ser. 58, 101-111) and our investigations of the silicate to nitrate uptake ratios confirm the earlier distinction. Oligotrophic antarctic waters mainly exhibit proportionally higher silicate removal what induces a potential for nitrate excess. The nitrogen uptake regime of such areas is characterised by low absolute as well as specific nitrate uptake rates throughout. Maximal values did not exceed 0.15 mu M d(-1) and 0.005 h(-1), respectively. Corresponding f-ratios ranged from 0.39 to 0.86. This scenario contrasts strikingly to the more fertile ice edge areas. They showed a drastic but short vernal increase in nitrate uptake. Absolute uptake rates reached a maximum value of 2.18 mu M d(-1) whereas the maximal specific uptake rate was 0.063 h(-1). In addition to an optimal physical environment for bloom development, accumulation of ammonium stimulated nitrate uptake in a direct or indirect way. Since ammonium build-up in surface waters traces enhanced remineralisation, release of other essential compounds during degradation of organic matter might have been the main trigger. This peak nitrate utilisation during early spring led to the observed potential for silicate excess. With increasing seasonal maturity the nitrate uptake became inhibited by the presence of enhanced ammonium availability (up to 8% of the inorganic nitrogen pool), however, and after a short period of intensive nitrate consumption the uptake rates drop to very low levels, which are comparable to the ones observed in the area of nitrate excess at silicate exhaustion. status: published |
format |
Article in Journal/Newspaper |
author |
Goeyens, Leo Semeneh, M Baumann, MEM Elskens, M Shopova, D Dehairs, F |
author_facet |
Goeyens, Leo Semeneh, M Baumann, MEM Elskens, M Shopova, D Dehairs, F |
author_sort |
Goeyens, Leo |
title |
Phytoplanktonic nutrient utilisation and nutrient signature in the Southern Ocean |
title_short |
Phytoplanktonic nutrient utilisation and nutrient signature in the Southern Ocean |
title_full |
Phytoplanktonic nutrient utilisation and nutrient signature in the Southern Ocean |
title_fullStr |
Phytoplanktonic nutrient utilisation and nutrient signature in the Southern Ocean |
title_full_unstemmed |
Phytoplanktonic nutrient utilisation and nutrient signature in the Southern Ocean |
title_sort |
phytoplanktonic nutrient utilisation and nutrient signature in the southern ocean |
publisher |
Elsevier science bv |
publishDate |
1998 |
url |
https://lirias.kuleuven.be/handle/123456789/45640 http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=CCC&SrcApp=PRODUCT_NAME&SrcURL=WOS_RETURN_URL&CKEY=GOEY0143980017JL&DestLinkType=FullRecord&DestApp=CCC&SrcDesc=RETURN_ALT_TEXT&SrcAppSID=APP_SID |
geographic |
Antarctic Southern Ocean Weddell Sea Scotia Sea Indian Weddell Antarctic Ocean |
geographic_facet |
Antarctic Southern Ocean Weddell Sea Scotia Sea Indian Weddell Antarctic Ocean |
genre |
Antarc* Antarctic Antarctic Ocean Scotia Sea Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Ocean Scotia Sea Southern Ocean Weddell Sea |
op_relation |
Journal of marine systems vol:17 issue:1-4 pages:143-157 https://lirias.kuleuven.be/handle/123456789/45640 0924-7963 http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=CCC&SrcApp=PRODUCT_NAME&SrcURL=WOS_RETURN_URL&CKEY=GOEY0143980017JL&DestLinkType=FullRecord&DestApp=CCC&SrcDesc=RETURN_ALT_TEXT&SrcAppSID=APP_SID |
_version_ |
1766274113387626496 |