Lett Christophe auteur aut IRD Penven Pierrick auteur aut IRD Ayon P. auteur aut IRD Fréon Pierre auteur aut IRD text journalArticle eng text/pdf born digital access A Lagrangian model is used to simulate and quantify in the northern Humboldt upwelling ecosystem the processes of enrichment, concentration and retention, identified by Bakun [Bakun, A., 1996. Patterns in the ocean. Ocean processes and marine population (sic). University of California Sea Grant, California, USA, in cooperation with Centro de Investigaciones Biologicas de Noroeste, (sic) California Sur, Mexico, 323 pp.] as being important for the survival and recruitment of early life stages of pelagic fish. The method relies on tracking the positions of particles within water velocity fields generated by a three-dimensional hydrodynamic model. Simple criteria for considering particles as participating to enrichment, concentration or retention are used to derive indices of the three processes. We analyse the spatial distribution of and seasonal variability in these indices. The results are discussed in relation to anchovy (Engraulis ringens) eggs and larvae distributions off Peru, and to a comparable study conducted in the southern Benguela upwelling ecosystem. specialized Lagrangian model ocean triad enrichment concentration retention pelagic fish recruitment ichthyoplankton Peru hydrodynamic model mesoscale 040 64 1-4 189-200 2007 0924-7963 https://www.documentation.ird.fr/hor/fdi:010037838 10.1016/j.jmarsys.2006.03.012 0924-7963 [F A010037838] https://www.documentation.ird.fr/hor/fdi:010037838 https://www.documentation.ird.fr/intranet/publi/2007/03/010037838.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2007-03-30 2017-08-23 fdi:010037838 fre