Seasonal variation of copepod communities in the Senegal-Gambia waters [résumé]
ICAWA : International Conference AWA, Dakar, SEN, 13-/12/2016 - 15/12/2016 The analysis of the seasonal variation of copepods in the Senegal-Gambia maritime area, using a comparative approach (cold season (May) and warm season (November)) was carried out using data collected during ecosystem cruises...
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ftccsdartic:oai:HAL:hal-04372664v1 2024-02-27T08:40:36+00:00 Seasonal variation of copepod communities in the Senegal-Gambia waters [résumé] Ndour, I. Ndiaye, I. Balde, A. Brehmer, Patrice Thiaw, M. Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Brehmer, Patrice (ed.) Ba, B. (ed.) Kraus, G. (ed.) Dakar, France 2016-12-13 https://hal.science/hal-04372664 en eng HAL CCSD SRFC/CSRP IRD ISBN: 978-2-9553602-0-5 hal-04372664 https://hal.science/hal-04372664 IRD: fdi:010072109 ICAWA : International Conference AWA https://hal.science/hal-04372664 ICAWA : International Conference AWA, Dec 2016, Dakar, France. p. 37 SENEGAL GAMBIE ATLANTIQUE [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.EE]Life Sciences [q-bio]/Ecology environment info:eu-repo/semantics/conferenceObject Conference papers 2016 ftccsdartic 2024-01-28T00:12:22Z ICAWA : International Conference AWA, Dakar, SEN, 13-/12/2016 - 15/12/2016 The analysis of the seasonal variation of copepods in the Senegal-Gambia maritime area, using a comparative approach (cold season (May) and warm season (November)) was carried out using data collected during ecosystem cruises aboard the Norwegian vessel Fridtjof Nansen in November 2011 and May 2012. Zooplankton samples were collected between 0 and 50 m depth using a multinet of 80 ?m mesh, towed obliquely behind the vessel, over the continental shelf. Post processing of the samples (n = 34) were made in laboratory by microscopy and the copepod were identified to the lowest possible taxonomic level and counted, using appropriate identification keys. Paracalanus parvus was dominant with 22 % followed by Oncaea venusta (19 %) and Temora stylifera (12 %) in the cold season. In contrast, in the warm season, these two species (P. parvus O. venusta) still dominant with 26% and 13 %, respectively. A total of 34 species of copepods were identified during the cold season, compared with 27 species during the warm season. In one hand, during the cold season, an area of high concentration of copepods was found off the mouth of the Casamance River. On the other hand, during the warm season, two areas of high concentration were identified off the peninsula of Cap-Vert and Casamance. The copepod group which represents 2/3 of the zooplankton would be an ideal indicator for the identification of signatures of changes in phenology and / or latitudinal displacement of species in relation to climatic variations. All of these aspects reflect the interest of this study in improving knowledge of the responses of marine organisms to climate change in the south part of the west African east border upwelling. Conference Object Fridtjof Nansen Copepods Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Fridtjof ENVELOPE(-56.717,-56.717,-63.567,-63.567) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
SENEGAL GAMBIE ATLANTIQUE [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.EE]Life Sciences [q-bio]/Ecology environment |
spellingShingle |
SENEGAL GAMBIE ATLANTIQUE [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.EE]Life Sciences [q-bio]/Ecology environment Ndour, I. Ndiaye, I. Balde, A. Brehmer, Patrice Thiaw, M. Seasonal variation of copepod communities in the Senegal-Gambia waters [résumé] |
topic_facet |
SENEGAL GAMBIE ATLANTIQUE [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDV.EE]Life Sciences [q-bio]/Ecology environment |
description |
ICAWA : International Conference AWA, Dakar, SEN, 13-/12/2016 - 15/12/2016 The analysis of the seasonal variation of copepods in the Senegal-Gambia maritime area, using a comparative approach (cold season (May) and warm season (November)) was carried out using data collected during ecosystem cruises aboard the Norwegian vessel Fridtjof Nansen in November 2011 and May 2012. Zooplankton samples were collected between 0 and 50 m depth using a multinet of 80 ?m mesh, towed obliquely behind the vessel, over the continental shelf. Post processing of the samples (n = 34) were made in laboratory by microscopy and the copepod were identified to the lowest possible taxonomic level and counted, using appropriate identification keys. Paracalanus parvus was dominant with 22 % followed by Oncaea venusta (19 %) and Temora stylifera (12 %) in the cold season. In contrast, in the warm season, these two species (P. parvus O. venusta) still dominant with 26% and 13 %, respectively. A total of 34 species of copepods were identified during the cold season, compared with 27 species during the warm season. In one hand, during the cold season, an area of high concentration of copepods was found off the mouth of the Casamance River. On the other hand, during the warm season, two areas of high concentration were identified off the peninsula of Cap-Vert and Casamance. The copepod group which represents 2/3 of the zooplankton would be an ideal indicator for the identification of signatures of changes in phenology and / or latitudinal displacement of species in relation to climatic variations. All of these aspects reflect the interest of this study in improving knowledge of the responses of marine organisms to climate change in the south part of the west African east border upwelling. |
author2 |
Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Brehmer, Patrice (ed.) Ba, B. (ed.) Kraus, G. (ed.) |
format |
Conference Object |
author |
Ndour, I. Ndiaye, I. Balde, A. Brehmer, Patrice Thiaw, M. |
author_facet |
Ndour, I. Ndiaye, I. Balde, A. Brehmer, Patrice Thiaw, M. |
author_sort |
Ndour, I. |
title |
Seasonal variation of copepod communities in the Senegal-Gambia waters [résumé] |
title_short |
Seasonal variation of copepod communities in the Senegal-Gambia waters [résumé] |
title_full |
Seasonal variation of copepod communities in the Senegal-Gambia waters [résumé] |
title_fullStr |
Seasonal variation of copepod communities in the Senegal-Gambia waters [résumé] |
title_full_unstemmed |
Seasonal variation of copepod communities in the Senegal-Gambia waters [résumé] |
title_sort |
seasonal variation of copepod communities in the senegal-gambia waters [résumé] |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-04372664 |
op_coverage |
Dakar, France |
long_lat |
ENVELOPE(-56.717,-56.717,-63.567,-63.567) |
geographic |
Fridtjof |
geographic_facet |
Fridtjof |
genre |
Fridtjof Nansen Copepods |
genre_facet |
Fridtjof Nansen Copepods |
op_source |
ICAWA : International Conference AWA https://hal.science/hal-04372664 ICAWA : International Conference AWA, Dec 2016, Dakar, France. p. 37 |
op_relation |
ISBN: 978-2-9553602-0-5 hal-04372664 https://hal.science/hal-04372664 IRD: fdi:010072109 |
_version_ |
1792047718310346752 |