Brochier Timothée, Mason E., Moyano M., Berraho A., Colas F., Sangra P., Hernandez-Leon S., Ettahiri O., Lett Christophe. (2014). Ichthyoplankton transport from the African coast to the Canary Islands. In :
Book of Abstracts submitted to the IV Congress of Marine Sciences. Las Palmas de Gran Canaria : Universidad de Las Palmas de Gran Canaria, p. 164. Congress of Marine Sciences, 4., Las Palmas de Gran Canaria (SPA), 2014/06/11-13. ISBN 978-84-697-0471-4.
Titre du document
Ichthyoplankton transport from the African coast to the Canary Islands
Année de publication
2014
Type de document
Colloque
Auteurs
Brochier Timothée, Mason E., Moyano M., Berraho A., Colas F., Sangra P., Hernandez-Leon S., Ettahiri O., Lett Christophe
In
Book of Abstracts submitted to the IV Congress of Marine Sciences
Source
Las Palmas de Gran Canaria : Universidad de Las Palmas de Gran Canaria, 2014,
p. 164 ISBN 978-84-697-0471-4
Colloque
Congress of Marine Sciences, 4., Las Palmas de Gran Canaria (SPA), 2014/06/11-13
The Canary Upwelling System (CUS), a major eastern boundary upwelling system, sustains large crossborder 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.
Plan de classement
Dynamique des eaux [032DYNEAU]
;
Poissons [034BIOVER01]
Descripteurs
FAUNE ICHTYOLOGIQUE ; ZOOPLANCTON ; POISSON MARIN ; ESPECE PELAGIQUE ; SARDINE ; LARVE ; PONTE ; TRANSPORT ; UPWELLING ; HYDRODYNAMIQUE ; STOCK ; MODELISATION ; ANCHOIS
Description Géographique
ATLANTIQUE ; ESPAGNE ; MAROC NORD OUEST
Localisation
Fonds IRD [F B010064369]
Identifiant IRD
fdi:010064369
