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	Provedor de dados ArchiMer (3) Autor Brehmer, Patrice (3) Sarre, Abdoulaye (3) Diogoul, Ndague (2) El Ayoubi, Salaheddine (2) Mouget, Anne (2) Perrot, Yannick (2) Abou Thiam, (1) Demarcq, Herve (1) Krakstad, Jens-otto (1) Mbye, Ebou Mass (1) Migayrou, Chloe (1) Sadio, Oumar (1) Thiam, Abou (1) Tiedemann, Maik (1) Mais... Palavra-chave Ethmalosa fimbriata (1) Fish distribution (1) Ilisha africana (1) Sardinella spp. (1) West Africa (1) Tipo do documento Text (3) Ano 2021 (1) 2020 (1) 2018 (1) País France (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Spatial distribution of main clupeid species in relation to acoustic assessment surveys in the continental shelves of Senegal and The Gambia ArchiMer Sarre, Abdoulaye; Krakstad, Jens-otto; Brehmer, Patrice; Mbye, Ebou Mass. This work compiles hydroacoustic recordings and catch data over Senegambia (Senegal and The Gambia) from assessment surveys on the major clupeid species to identify sources of bias in abundance estimates caused by their horizontal distribution. The latitudinal distribution of small pelagic fish is often well known, while their "across shelf" distribution on the continental shelf is less understood. The southern part of the Senegambian shelf has a wide shallow water (< 10 m) area that makes up 20% (1500NM(2)) of the total shelf surface, while the northern part accounts for 3% (200NM(2)). These areas are not assessed by conventional fisheries acoustics surveys and therefore increase the uncertainty of the assessment of these species. Our findings show... Tipo: Text Palavras-chave: Fish distribution; Ethmalosa fimbriata; Ilisha africana; Sardinella spp.; West Africa. Ano: 2018 URL: https://archimer.ifremer.fr/doc/00426/53765/72090.pdf On the robustness of an eastern boundary upwelling ecosystem exposed to multiple stressors ArchiMer Diogoul, Ndague; Brehmer, Patrice; Demarcq, Herve; El Ayoubi, Salaheddine; Thiam, Abou; Sarre, Abdoulaye; Mouget, Anne; Perrot, Yannick. The resistance of an east border upwelling system was investigated using relative index of marine pelagic biomass estimates under a changing environment spanning 20-years in the strongly exploited southern Canary Current Large marine Ecosystem (sCCLME). We divided the sCCLME in two parts (north and south of Cap Blanc), based on oceanographic regimes. We delineated two size-based groups (“plankton” and “pelagic fish”) corresponding to lower and higher trophic levels, respectively. Over the 20-year period, all spatial remote sensing environmental variables increased significantly, except in the area south of Cap Blanc where sea surface Chlorophyll-a concentrations declined and the upwelling favorable wind was stable. Relative index of marine pelagic... Tipo: Text Ano: 2021 URL: https://archimer.ifremer.fr/doc/00676/78789/81019.pdf Fine-scale vertical structure of sound-scattering layers over an east border upwelling system and its relationship to pelagic habitat characteristics ArchiMer Diogoul, Ndague; Brehmer, Patrice; Perrot, Yannick; Tiedemann, Maik; Abou Thiam,; El Ayoubi, Salaheddine; Mouget, Anne; Migayrou, Chloe; Sadio, Oumar; Sarre, Abdoulaye. Understanding the relationship between sound-scattering layers (SSLs) and pelagic habitat characteristics is a substantial step to apprehend ecosystem dynamics SSLs are detected on echo sounders representing aggregated marine pelagic organisms. In this study, SSL characteristics of zooplankton and micronekton were identified during an upwelling event in two contrasting areas of the Senegalese continental shelf. Here a cold upwelling-influenced inshore area was sharply separated by a strong thermal boundary from a deeper, warmer, stratified offshore area. Mean SSL thickness and SSL vertical depth increased with the shelf depth. The thickest and deepest SSLs were observed in the offshore part of the shelf. Hence, zooplankton and micronekton seem to occur... Tipo: Text Ano: 2020 URL: https://archimer.ifremer.fr/doc/00606/71777/70261.pdf Registros recuperados: 3 Primeira ... 1 ... Última

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