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Compaire, J., P., Pérez-Brunius, S.P.A., Jiménez-Rosenberg, J., Rodríguez-Outerelo, L., Echeverri-García & S.Z., Herzka (2021). Connectivity of coastal and neritic fish larvae to the deep waters. Limnology and Oceanography. 66(6): 2423-2441. DOI: 10.1002/lno.11762.

Connectivity of coastal and neritic fish larvae to the deep waters

Jesús Compaire 1, Paula Pérez-Brunius 2, Sylvia Patricia Adelheid Jiménez-Rosenberg 3, Javier Rodríguez-Outerelo 2, Laura Echeverri-García 2 y Sharon Z. Herzka 2

1 Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE) y CONICET–Universidad de Buenos Aires, Centro de Investigaciones del Mar y la Atmósfera (CIMA), Buenos Aires, Argentina
2 Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, Mexico
3 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Departamento de Plancton y Ecología Marina
Four ichthyoplankton cruises and backward tracking experiments were conducted to study the connectivityof coastal and neritic fish larvae over the continental slope and to the oceanic deep-water region of the westernGulf of Mexico. Distribution patterns of larval abundance at oceanic stations showed higher abundance and thepresence of larvae at oceanic stations during two cruises. Larval transport was simulated using outputs of a dataassimilation model that represented the flow conditions during each cruise. Higher abundances of larvae ofcoastal and neritic species at oceanic stations agreed with offshore transport inferred from numerical experimentsseeding particles over different spatial scales (stations vs. transects). Satellite images of surface chlorophyllwere consistent with the circulation patterns indicated by the model, indicating filaments of shelf waters weretransported toward the transects with higher larval abundances. Particle tracking experiments indicated that thenorthwestern shelf provinces of Perdido, Tamaulipas, and Texas were the main source of propagules to the oceanicregion, while shelf provinces of northern Veracruz, Campeche, Yucatan, Louisiana, and Mississippi-Alabamacontributed much less. The length and intensity of the shelf front limited ichthyoplankton cross-shelfexchange during some cruises, and mesoscale anticyclonic and cyclonic eddies advected larvae to the deepwaterregion during others. The agreement between the spatial distribution of fish larvae and the simulated larvaltransport confirm that circulation models are a valuable tool for examining potential dispersal pathways ofneritic species, as long as similar spatial and temporal scales as the ones used in this study are considered.

Palabras clave: Ichthyoplanlton; Gulf of Mexico; CIGoM

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