Romero, E., L., Sánchez-Velasco, L., Tenorio-Fernández, S.P.A., Jiménez-Rosenberg, A., Sánchez-Pérez, M., Fundora-Pozo & E., Beier (2024). Mesoscale activity in the northeastern pacific water mass convergence region and its influence on fish larvae distribution by development stages (October 2022). Deep Sea Research Part I: Oceanographic Research Papers. 204: 104228. DOI: 10.1016/j.dsr.2023.104228.
Emmanuel Romero 1, Laura Sánchez-Velasco 2, Leonardo Tenorio-Fernández 3, Sylvia Patricia Adelheid Jiménez-Rosenberg 4, Amelia Sánchez-Pérez 1, Manuel Fundora-Pozo 1 y Emilio Beier 5
Based on satellite, hydrographic, and zooplankton data, the mesoscale activity, and its effect on the threedimensionaldistribution of fish larvae in the northeastern Pacific water mass convergence region off Mexicoduring October 2022 were analyzed. Three eddies were observed during the cruise, but two were measured. Ananticyclonic eddy (not crossed by the cruise) was observed by satellite data in the mouth of the Gulf of California.It formed off Mazatl´an in Transitional Water and moved southeast of Cabo San Lucas. It was the smallest(10,207.4 km) and least energetic (140.7 cm2s?? 2) of the eddies. A parallel sampling transect to this eddy showedpredominance of fish larvae in preflexion stage in the surface mixed layer with dominance of Benthosema panamenseand Syacium ovale species (epi-mesopelagic and soft-bottom demersal species). A second anticycloniceddy had formed about a month earlier in the Tropical Surface Water when this was measured. Its trajectoryshowed that it came from the mainland coast off Cabo Corrientes. It was the most energetic (216.6 cm2 s?? 2) andpresented the maximum anomalies of temperature (7.4 ?C) and Dissolved Oxygen (>50 µmol kg?? 1), due to thedownwelling that it produced (up to 95 m depth). It was also associated with the highest concentration of fishlarvae (231.3 larvae 100m?? 3) from ~200 m depth to surface, observing dominance of larvae in flexion stage ofB. panamense and Bregamaceros bathymaster (coastal neritic species). This eddy could also retain and transportspecies of soft-bottom demersal habits (Dormitator latifrons). One cyclonic eddy, located off Cabo San Lucas hadCalifornia Current Water. It was the largest (26,032 km2) and oldest forming about nine months earlier offmainland coast in front of Pabellones Cove. Due to the upwelling of deeper water (up to 530 m depth), theminimum anomaly values of temperature (?? 5.8 ?C), salinity (<?? 0.5 g kg?? 1) and Dissolved Oxygen (<?? 50µmol kg?? 1) were present. Low abundance of species such as Vinciguerria lucetia and Diogenichthys laternatus (bothepi-mesopelagic) in the postflexion stage were presented there. Results showed that mesoscale eddies affectedthe three-dimensional fish larvae distribution in different ways. This could broaden the vision of the mesoscaleevolution of physical-biological interactions in the oceans.
Palabras clave: Mesoscale eddies; Eddy trajectories; Water column structure; Fish larvae development stages; Water mass convergence; Physical-biological interactions
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