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Title: Ichthyoplankton transport from the African coast to the Canary Islands
Authors: Brochier, Timothée
Mason, Evan
Moyano, Marta
Berraho, Amina
Colas, Francois
Sangrá Inciarte, Pablo 
Hernández-León, Santiago 
Ettahiri, Omar
Lett, Christophe
UNESCO Clasification: 251001 Oceanografía biológica
240119 Zoología marina
Keywords: Canary Current
Hydrodynamic model
Lagrangian model
Upwelling filaments
Transport, et al
Issue Date: 2011
Publisher: 0924-7963
Project: Conafrica: la Conexion Africana en la Corriente de Canarias 
Journal: Journal of Marine Systems 
Abstract: The Canary Upwelling System (CUS), a major eastern boundary upwelling system, sustains large cross-border fisheries of small pelagic fish, which poses the question of stock connectivity. Studies suggest that ichthyoplankton transport from the northwest African coast to the Canary Islands (CI) is facilitated by coastal-upwelling associated filaments. Here we analyze connections between larval supply to the CI and sardine and anchovy populations that spawn over the continental shelf. For both species, ichthyoplankton observations (1) at the shelf and (2) near the island of Gran Canaria (GC) are used. Predictions of ichthyoplankton transport to GC are obtained from the Ichthyop Lagrangian transport model, which is forced by a high-resolution hydrodynamic model (ROMS) that reproduces the regional circulation. Results show that upwelling filaments play an important role in the transport of larvae to GC. However, (1) filaments are not the only mechanism, and (2) filament presence does not necessarily imply larval transport. Anchovy and sardine larval presence at GC appears to be independent of the respective adult spawning seasonality. Combining of observed and modeled data does not succeed in reproducing the observed larval patterns at GC. Various hypotheses are proposed to explain this discrepancy in larval transport to GC.
ISSN: 0924-7963
DOI: 10.1016/j.jmarsys.2011.02.025
Source: Journal of Marine Systems [ISSN 0924-7963], v. 87, p. 109-122
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