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VOLVER A TABLA DE CONTENIDOS Volumen 51

NÚMERO 2

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Cambios en la dieta de dos especies de mojarras (Gerreidae) en la Laguna de Términos, Campeche, México

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Food resources of Eucinostomus (Perciformes: Gerreidae) in a hyperhaline lagoon: Yucatan Peninsula, Mexico

Autores

CORRESPONSAL

Ariel Adriano Chi-Espínola

kain_ex@hotmail.com

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Laboratorio de Taxonomía y Ecología de Peces, CINVESTAV-IPN, Unidad Mérida, km 6 antigua carretera a Progreso, AP 73 Cordemex, C. P. 97310 Mérida, Yucatán, México

María Eugenia Vega-Cendejas

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Laboratorio de Taxonomía y Ecología de Peces, CINVESTAV-IPN, Unidad Mérida, km 6 antigua carretera a Progreso, AP 73 Cordemex, C. P. 97310 Mérida, Yucatán, México

Resumen

The high salinity of hyperhaline lagoons makes them extreme habitats for aquatic organisms, putting demands on their special physiological adaptations. The Gerreidae are a family of widely distributed and abundant fish in coastal lagoons, which are very important for ecosistem functions and fisheries. The aim of this study was to evaluate and compare the trophic ecology of 2 species of mojarra in the hyperhaline lagoon (>50) of Ria Lagartos, Yucatan, in order to provide evidence of the importance of this habitat for growth and trophic requirements. Samples were collected bimonthly during an annual cycle (2004-2005). A total of 920 fish specimens of Eucinostomus argenteus (493) and E. gula (427) were collected. Trophic components were analysed using the Relative Importance Index (RII) and multivariate analyses. The mojarras were defined as second-order consumers, feeding on annelids, microcrustaceans (amphipods, copepods, tanaidaceans, ostracods), and significant amounts of detritus with variations in proportion and frequency according to food availability. Both species shared the same food resources, however ontogenetic differences were observed with spatial and temporal variations, thus avoiding interspecific competition. Results provide evidence of the importance of these coastal habitats in the life-history stages for species and food resource requirements of juvenile marine euryhaline fish.

Palabras clave

Hyperhaline lagunar systems, mojarras, feeding preferences, ontogenetic shifts, benthic preys

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