Mouget A., Brehmer Patrice, Jeyid M.A., Sarré A., El-Ayoubi S., Diogoul N., Sidibeh M., Perrot Yannick. (2022). Comparative analysis of pelagic compartment organization by bathymetric strata in the Canary Current Large Marine Ecosystem [résumé]. In :
Jech M. (ed.). Working group of fisheries acoustics, science and technology (WGFAST). ICES Scientifics Reports, 4 (54), 36-37. ICES. Working Group of Fisheries Acoustics, Science and Technology (WGFAST), Somone (SEN), 2022/04/25-28. ISSN 2618-1371.
Titre du document
Comparative analysis of pelagic compartment organization by bathymetric strata in the Canary Current Large Marine Ecosystem [résumé]
Année de publication
2022
Type de document
Colloque
Auteurs
Mouget A., Brehmer Patrice, Jeyid M.A., Sarré A., El-Ayoubi S., Diogoul N., Sidibeh M., Perrot Yannick
In
Jech M. (ed.), Working group of fisheries acoustics, science and technology (WGFAST)
Source
ICES Scientifics Reports, 2022,
4 (54), 36-37 ISSN 2618-1371
Colloque
ICES. Working Group of Fisheries Acoustics, Science and Technology (WGFAST), Somone (SEN), 2022/04/25-28
The Canary Current Large Marine Ecosystem (CCLME) is located along the North West African coast from Morocco to Guinea Bissau. In this work, 14 Nansen fisheries acoustics surveys have been led from the southern border of Senegal (12.15°N) to the Cape Blanc (20.77°N) during the hot wet season, i.e., outside the seasonal upwelling period, from 1995 to 2015. The aim of this study was to scrutinize the water column organization in a bathymetric gradient starting from the coast to the offshore area, discretised in three areas: inshore (< 150m), transition (150-500m) and off shore (> 500m). Here, we worked on acoustic sound scattering layers (SSL) and on the whole water column through echointegrated data (EI). SSL and EI descriptors highlighted sig-nificant difference between the three depth strata. Study of the Diel Vertical Migration (DVM) highlighted that volume backscattering coefficient (proxy of pelagic abundance) vertical profile from transition area has a pattern globally similar to offshore one while inshore presented an inversed pattern. Analyse of annual change using EI descriptors reveal one common trait: the number of SSLs significantly increase whatever the depth strata considered. This study high-lights differences and similarity in water column organization between depth strata.
Plan de classement
Limnologie physique / Océanographie physique [032]
;
Ressources halieutiques [040]
Localisation
Fonds IRD [F B010089464]
Identifiant IRD
fdi:010089465
