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17 páginas, 9 figuras, 1 tabla.-- This work is licensed under a Creative Commons Attribution 3.0 Spain (CC-by)[EN] We investigate the transport dynamics of decapod larvae in the Canary-African coastal transition zone (C-ACTZ), where larval assemblages are poorly known. In August 1999, during the FAX99 cruise, the waters downstream of the Canary Island archipelago displayed intense mesoscale activity, with numerous cyclonic and anticyclonic eddies as well as upwelling filaments. Our results illustrate a close relationship between these mesoscale oceanographic structures and the distribution of decapod larvae, using both field observations and Lagrangian transport modelling. Analysis of plankton samples shows that larvae of pelagic species were excluded from filament waters, whereas larvae of neritic species were heterogeneously distributed, suggesting that the C-ACTZ is a mixing area where larvae originating from both the Canary Islands and the African coast may be present at the same time. This finding was supported by the simulations, which suggested that the larvae collected in the offshore waters south of Gran Canaria came mainly from the African population (between Cape Bojador and Cape Juby) during early August, whereas during the second half of August the targeted area was dominated by larvae released from Fuerteventura populations. Our observations introduce new insights into our understanding of marine population connectivity, the dispersal pathways of the terrestrial biota, and general biogeography in the region[ES] Investigamos la dinámica del transporte de larvas de decápodos en la región de transición canario-africana (C-ACTZ), donde el conocimiento sobre las asociaciones de larvas es escaso. En agosto de 1999, durante la campaña FAX99, las aguas al sur del Archipiélago Canario mostraron una intensa actividad mesoescalar a modo de numerosos remolinos ciclónicos y anticiclónicos, así como de filamentos de afloramiento. Nuestros resultados ilustran una relación estrecha entre las estructuras oceanográficas mesoescalares y la distribución de larvas de decápodos tanto mediante observaciones in situ como modelos de transporte larvario. El análisis de las muestras de plancton mostró la práctica ausencia de larvas de especies pelágicas en aguas asociadas al filamento de afloramiento, mientras que las larvas de especies neríticas mostraron una distribución heterogénea, lo que indica que la C-ACTZ es una zona de mezcla donde larvas con origen canario y africano pueden coexistir simultáneamente. Las simulaciones apoyaron estos patrones de distribución y sugieren que las larvas presentes en aguas abiertas al sur de Gran Canaria llegaron principalmente desde poblaciones africanas a principios de agosto, mientras que durante la segunda mitad del mes fueron larvas liberadas desde las poblaciones de Fuerteventura, las que dominaron la región de estudio. Nuestras observaciones introducen nuevos datos que contribuyen a una mejor comprensión de los patrones de conectividad en el medio marino, así como de las vías de dispersión de la biota marina y terrestre y la biogeografía global de la regiónThis work was supported through the projects CANIGO,\udMAS3.CT96-0060 (EU) and MAFIA, CTM2012-\ud39587-C04-0 (CICYT, Spain). JML was funded by an\udFPI fellowship (BES-2005-10960) from the European\udSocial Fund and a postdoctoral fellowship from the\udJapan Society for Promotion of Science (PE16401).\udEM was partially supported by a post-doctoral grant\udfrom the Conselleria d’Educació, Cultura i Universitats\uddel Govern de les Illes Balears (Mallorca, Spain),\udthe European Social Fund and the Copernicus Marine\udEnvironment Monitoring Service (CMEMS) MedSUB\udproject. TB was funded by the AWA project “Ecosystem\udApproach to the management of fisheries and the\udmarine environment in West African waters” funded by\udthe BMBF and IRD (grant agreement 01DG12073E),\udand by the project PREFACE funded by the European\udCommission’s Seventh Framework Programme (2007-\ud2013) – Cooperation (ENV.2013.6.1-1), under Grant\udAgreement number 603521Peer reviewe

scientia marina

Transport pathways of decapod larvae under intense mesoscale activity in the Canary-African coastal transition zone: implications for population connectivity