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ISSUE 3

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Spatial and temporal variations of coastal fish larvae, ectoparasites and oceanographic conditions off central Chile

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First record of the dinoflagellate Oxytoxum caudatum (Peridiniales: Oxytoxaceae) in the Gulf of California

RESEARCH NOTE

Efectos de un remolino de mesoescala sobre la distribución de larvas de peces mesopelágicas en el Golfo de California

Authors

CORRESPONDING

Fernando Contreras-Catala

fcontrerascatala@gmail.com

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Departamento de Plancton y Ecología Marina, CICIMAR-IPN, Av. Instituto Politécnico Nacional s/n, C.P. 23096, La Paz, B.C.S. México

Laura Sánchez-Velasco

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Departamento de Plancton y Ecología Marina, CICIMAR-IPN, Av. Instituto Politécnico Nacional s/n, C.P. 23096, La Paz, B.C.S. México

Emilio Beier

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Centro de Investigación Científica y de Educación Superior de Ensenada, Unidad La Paz, Miraflores 334 E/ Mulegé y La Paz, Col. Bella Vista, La Paz, B.C.S. 23050, México

Victor M. Godínez

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Departamento de Oceanografía Física, CICESE, Carretera Ensenada-Tijuana 3918, Zona Playitas, Ensenada, Baja California, 22860, México

Abstract

We examined the effect of a mesoscale cyclonic eddy on the three-dimensional distribution of Vinciguerria lucetiaand Diogenichthys laternatus in southern Gulf of California during July 2010. CTD data and zooplankton samples collected with a closing-opening net (505 µm), were obtained on 2 transects across the eddy, and on a transect outside of the mesoscale structure. In the later the thermocline depth was at ~40 m where larvae V. lucetiadominated. Opposite to V. lucetia distribution, D. laternatus larvae was the dominant species in the deepest strata. In the area influenced by the cyclonic eddy (~350 m depth and ~60 km diameter), the thermocline was sunk from ~25 m (eddy edge) to ~50 m depth (eddy center). The isotherms below the thermocline formed a dome from ~350 m to ~100 m depth in the eddy center. This upwelling coincided with an increase of D. laternatus larvae in the water column. Compared with the transect outside of the cyclonic eddy, the shoaling of the isotherms inside the eddy produced not only an increase of D. laternatus larvae, also decreased the V. lucetia abundance. These variations in larval distribution of both mesopelagic species are closely correlated with the mesoscale cyclonic eddy.

Key words

Three-dimensional distribution, Vinciguerria lucetiaDiogenichthys laternatus, cyclonic eddy

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