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Water masses and mesoscale control on latitudinal and cross-shelf variations in larval fish assemblages off NW Africa

AutorOlivar, M. Pilar ; Sabatés, Ana ; Pastor, Maria V. ; Pelegrí, Josep Lluís
Palabras claveFish larvae
Mesoscale hydrography
Canary upwelling
Cape Verde Frontal Zone
Mesoscale eddies
Fecha de publicaciónnov-2016
EditorPergamon Press
CitaciónDeep Sea Research Part I: Oceanographic Research Papers 117: 120-137 (2016)
ResumenWe explore the associations between larval fish assemblages and oceanographic conditions in the upper ocean (top 200 m) along the African slope, from tropical (15°N) to subtropical (35°N) latitudes, during a period of intense upwelling. In this extensive region, the northward Mauritanian Current and Poleward Undercurrent carry South Atlantic Central Waters (SACW) while the southward Canary Upwelling Current transports North Atlantic Central Waters (NACW). South of Cape Blanc we only find SACW, and north of Cape Blanc there is NACW far offshore and a combination of NACW and SACW nearshore, separated by the Canary Upwelling Front (CUF). The larvae of different myctophid species serve as indicators of the water masses, e.g. S. veranyi and M. punctatum were found in some coastal stations that were dominated by NACW, while the tropical mesopelagic B. argyrogaster, H. macrochir, M. affine and S. kreffti were associated to the SACW. The along-slope offshore convergence of NACW and SACW takes place at the Cape Verde Frontal Zone (CVFZ), representing a region of extensive offshore export for larvae of coastal species, S. pilchardus and E. encrasicolus, far from their nearshore spawning area. The large-scale frontal systems (CVFZ and CUF) and mesoscale eddies contribute to retain larvae within productive waters, influencing both coastal and oceanic species
Descripción18 pages, 13 figures, 2 tables, 1 appendix supplemental material https://dx.doi.org/10.1016/j.dsr.2016.10.003
Versión del editorhttps://dx.doi.org/10.1016/j.dsr.2016.10.003
Identificadoresdoi: 10.1016/j.dsr.2016.10.003
issn: 0967-0637
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