Diogoul N., Brehmer Patrice, Demarcq Hervé, El Ayoubi S., Thiam A., Mouget A., Sarré A., Perrot Yannick. (2022). On the resiliency of an eastern boundary upwelling ecosystem exposed to multiple stressors : an acoustic approach [résumé de poster]. In :
Jech M. (ed.). Working group of fisheries acoustics, science and technology (WGFAST). ICES Scientifics Reports, 4 (54), 49-50. ICES. Working Group of Fisheries Acoustics, Science and Technology (WGFAST), Somone (SEN), 2022/04/25-28. ISSN 2618-1371.
Titre du document
On the resiliency of an eastern boundary upwelling ecosystem exposed to multiple stressors : an acoustic approach [résumé de poster]
Année de publication
2022
Type de document
Colloque
Auteurs
Diogoul N., Brehmer Patrice, Demarcq Hervé, El Ayoubi S., Thiam A., Mouget A., Sarré A., Perrot Yannick
In
Jech M. (ed.), Working group of fisheries acoustics, science and technology (WGFAST)
Source
ICES Scientifics Reports, 2022,
4 (54), 49-50 ISSN 2618-1371
Colloque
ICES. Working Group of Fisheries Acoustics, Science and Technology (WGFAST), Somone (SEN), 2022/04/25-28
The resistance of an east border upwelling system was investigated using relative index of ma-rine 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 de-lineated 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 environ-mental 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 abundance was higher in the south area compared to the north area of Cap Blanc. No significant latitudinal shift to the mass center was detected, regardless of trophic level. Relative pelagic abundance did not change, suggesting sCCLME pelagic organisms were able to adapt to changing environmental conditions. Despite strong annual variability and the presence of major stressors (overfishing, climate change), the marine pelagic ressources, mainly fish and plankton remained relatively stable over the two decades, advancing our understanding on the resistance of this east border upwelling system.
Plan de classement
Limnologie physique / Océanographie physique [032]
;
Ressources halieutiques [040]
Localisation
Fonds IRD [F B010089464]
Identifiant IRD
fdi:010089771
