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Revista de biología marina y oceanografía

On-line version ISSN 0718-1957

Abstract

FLORES-ORTEGA, Juan Ramón; GODINEZ-DOMINGUEZ, Enrique  and  GONZALEZ-SANSON, Gaspar. Trophic ecology of seven batoids species (Batoidea) of the Mexican Central Pacific. Rev. biol. mar. oceanogr. [online]. 2015, vol.50, n.3, pp.521-533. ISSN 0718-1957.  http://dx.doi.org/10.4067/S0718-19572015000400010.

The stomach contents of 7 batoids species (Narcine entemedor, Narcine vermiculatus, Rhinobatos glaucostigma, Urolophus halleri, Urotrygon munda, Urotrygon rogersi and Zapteryx xyster) captured on the continental shelf of the central Mexican Pacific were analyzed in order to describe the diet composition, feeding strategy and trophic interactions during 2 hydroclimatic periods. In total, 1400 stomachs of 7 batoids species were analyzed and 29 prey items were identified (grouped in food category: shrimp, crabs, peracarids, stomatopods, cephalopods, fish and polychaetes). The main prey items were the shrimps (Ogyrididae, Penaeidae and Processidae), serpulid polychaete (Serpullidae) and portunid crabs (Portunidae). According to Smith´s index values, the 7 batoids species were generalist with a broad trophic spectrum. During the warm season the highest values of the diet overlap were recorded, mainly between species of the same family (Narcinidae, Rhinobatidae and Urotrygonidae). This pattern might be associated with the opportunism and preference to consume the most abundant prey, which reduces competence for food when resource is scarce.

Keywords : Batoids; feeding habits; trophic interactions; Mexican Central Pacific.

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