On the robustness of an eastern boundary upwelling ecosystem exposed to multiple stressors

Type Article
Date 2021-01
Language English
Author(s) Diogoul Ndague1, 2, 5, Brehmer Patrice1, 2, Demarcq Herve3, El Ayoubi Salaheddine4, Thiam Abou5, Sarre Abdoulaye1, Mouget Anne2, Perrot Yannick2
Affiliation(s) 1 : Institut Sénégalais de Recherches agricoles (ISRA), Centre de Recherches Océanographiques de Dakar-Thiaroye (CRODT), Dakar, Senegal
2 : IRD, CNRS, Univ Brest, Ifremer, DR Ouest, Lemar, Plouzané, France
3 : IRD, IFREMER, CNRS, Univ Montpellier, Marbec, Sète, France
4 : Institut National de Recherche Halieutique INRH, Agadir, Morocco
5 : University Cheikh Anta Diop (UCAD), Institute of Environmental Science (ISE), BP 5005, Dakar, Senegal
Source Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2021-01 , Vol. 11 , N. 1 , P. 1908 (12p.)
DOI 10.1038/s41598-021-81549-1
WOS© Times Cited 6

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 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.

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