Shaping of deep scattering layers by the seascape dynamics in the Canary islands

Vertical distribution of deep scattering layers (DSL) has been related to dissolved oxygen and illuminance levels as well horizontal water mass boundaries. Regional differences have precluded from establishing generic relationships between DSLs vertical the local hydrographical characteristics. This study used data collected at 18 38 kHz (that allow discriminate migrant non-migrant layers) during two surveys carried out in Canary islands autumn 2016 2017. We evaluated influence masses their nutrient content, eddies upwelling areas. While permanent coastal increased mesopelagic fishes are driven through a secondary-order effect by primary production), were not affected it. As other areas, main acoustic layer (400–600 m depth) was located interfaces. The secondary DSL, deeper than one, depths rich remineralized nutrients. Eddies modulated shape into domes (cyclonic) M-shapes (anticyclonic). contributes better understanding how seascape dynamics shapes islands.