Do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic)? A comparison of two contrasting years with special reference to anchovy (Engraulis encrasicolus L.) nutritional state
In the 2000 and 2001 springtime periods, mesozooplankton samples were systematically taken during research cruises devoted to the study of the distribution and abundance of small pelagic fishes in the French part of the Bay of Biscay, NE Atlantic, continental shelf. Simultaneous activities of three...
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ftarchimer:oai:archimer.ifremer.fr:12290 2023-05-15T17:38:32+02:00 Do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic)? A comparison of two contrasting years with special reference to anchovy (Engraulis encrasicolus L.) nutritional state Bergeron, Jean-pierre Delmas, Daniel Koueta, Noussithe 2010-10 application/pdf https://archimer.ifremer.fr/doc/00012/12290/9089.pdf https://archimer.ifremer.fr/doc/00012/12290/ eng eng The Oceanographic Society of Japan/TERRAPUB/Springer https://archimer.ifremer.fr/doc/00012/12290/9089.pdf https://archimer.ifremer.fr/doc/00012/12290/ 2010 The Oceanographic Society of Japan/TERRAPUB/Springer info:eu-repo/semantics/openAccess restricted use Journal Of Oceanography (0916-8370) (The Oceanographic Society of Japan/TERRAPUB/Springer), 2010-10 , Vol. 66 , N. 5 , P. 621-631 Rivers discharge phytoplankton distribution anchovy nutritional state RNA/DNA ratio mesozooplankton metabolic descriptors North-East Atlantic Bay of Biscay text Publication info:eu-repo/semantics/article 2010 ftarchimer 2021-09-23T20:18:37Z In the 2000 and 2001 springtime periods, mesozooplankton samples were systematically taken during research cruises devoted to the study of the distribution and abundance of small pelagic fishes in the French part of the Bay of Biscay, NE Atlantic, continental shelf. Simultaneous activities of three enzymes were measured in these mesozooplankton samples, to characterize the main features of ecosystem function at a regional scale. The aim was to assess assimilation rates of carbohydrates, through pyruvate kinase activity, and protein, through trypsin activity, by the mesozooplankton community and the resulting overall productivity, through aspartate transcarbamylase activity. The highest influence on the pelagic environment was the strong difference in the freshwater outflow rates from the two main large rivers, the Loire and the Gironde, which was principally responsible for the inter-annual fluctuations of the nutrients in the Bay. This overall influence of river flow results in a characteristic pattern of sea-surface salinity, which was reflected by the phytoplankton biomass distribution. Mesozooplankton enzyme activities showed high variations between the two years. The contrast in the dynamics of the pelagic food web processes between the two consecutive years, with higher activity in 2001, affected the nutritional condition of the zooplanktivorous breeding anchovy Engraulis encrasicolus. Article in Journal/Newspaper North East Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Rivers discharge phytoplankton distribution anchovy nutritional state RNA/DNA ratio mesozooplankton metabolic descriptors North-East Atlantic Bay of Biscay |
spellingShingle |
Rivers discharge phytoplankton distribution anchovy nutritional state RNA/DNA ratio mesozooplankton metabolic descriptors North-East Atlantic Bay of Biscay Bergeron, Jean-pierre Delmas, Daniel Koueta, Noussithe Do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic)? A comparison of two contrasting years with special reference to anchovy (Engraulis encrasicolus L.) nutritional state |
topic_facet |
Rivers discharge phytoplankton distribution anchovy nutritional state RNA/DNA ratio mesozooplankton metabolic descriptors North-East Atlantic Bay of Biscay |
description |
In the 2000 and 2001 springtime periods, mesozooplankton samples were systematically taken during research cruises devoted to the study of the distribution and abundance of small pelagic fishes in the French part of the Bay of Biscay, NE Atlantic, continental shelf. Simultaneous activities of three enzymes were measured in these mesozooplankton samples, to characterize the main features of ecosystem function at a regional scale. The aim was to assess assimilation rates of carbohydrates, through pyruvate kinase activity, and protein, through trypsin activity, by the mesozooplankton community and the resulting overall productivity, through aspartate transcarbamylase activity. The highest influence on the pelagic environment was the strong difference in the freshwater outflow rates from the two main large rivers, the Loire and the Gironde, which was principally responsible for the inter-annual fluctuations of the nutrients in the Bay. This overall influence of river flow results in a characteristic pattern of sea-surface salinity, which was reflected by the phytoplankton biomass distribution. Mesozooplankton enzyme activities showed high variations between the two years. The contrast in the dynamics of the pelagic food web processes between the two consecutive years, with higher activity in 2001, affected the nutritional condition of the zooplanktivorous breeding anchovy Engraulis encrasicolus. |
format |
Article in Journal/Newspaper |
author |
Bergeron, Jean-pierre Delmas, Daniel Koueta, Noussithe |
author_facet |
Bergeron, Jean-pierre Delmas, Daniel Koueta, Noussithe |
author_sort |
Bergeron, Jean-pierre |
title |
Do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic)? A comparison of two contrasting years with special reference to anchovy (Engraulis encrasicolus L.) nutritional state |
title_short |
Do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic)? A comparison of two contrasting years with special reference to anchovy (Engraulis encrasicolus L.) nutritional state |
title_full |
Do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic)? A comparison of two contrasting years with special reference to anchovy (Engraulis encrasicolus L.) nutritional state |
title_fullStr |
Do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic)? A comparison of two contrasting years with special reference to anchovy (Engraulis encrasicolus L.) nutritional state |
title_full_unstemmed |
Do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic)? A comparison of two contrasting years with special reference to anchovy (Engraulis encrasicolus L.) nutritional state |
title_sort |
do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the bay of biscay (ne atlantic)? a comparison of two contrasting years with special reference to anchovy (engraulis encrasicolus l.) nutritional state |
publisher |
The Oceanographic Society of Japan/TERRAPUB/Springer |
publishDate |
2010 |
url |
https://archimer.ifremer.fr/doc/00012/12290/9089.pdf https://archimer.ifremer.fr/doc/00012/12290/ |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_source |
Journal Of Oceanography (0916-8370) (The Oceanographic Society of Japan/TERRAPUB/Springer), 2010-10 , Vol. 66 , N. 5 , P. 621-631 |
op_relation |
https://archimer.ifremer.fr/doc/00012/12290/9089.pdf https://archimer.ifremer.fr/doc/00012/12290/ |
op_rights |
2010 The Oceanographic Society of Japan/TERRAPUB/Springer info:eu-repo/semantics/openAccess restricted use |
_version_ |
1766139020680626176 |