Feeding ecology of the transparent goby <em>Aphia minuta</em> (Pisces, Gobiidae) in the northwestern Adriatic Sea

Mario La Mesa; Diego Borme; Valentina Tirelli; Elena Di Poi; Sara Legovini; Serena Fonda Umani

doi:10.3989/scimar.2008.72n199

Autores/as

Mario La Mesa ISMAR-CNR, Istituto di Scienze Marine, Sezione di Ancona
Diego Borme OGS, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Dipartimento di Oceanografia Biologica
Valentina Tirelli OGS, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Dipartimento di Oceanografia Biologica
Elena Di Poi Dipartimento di Biologia, Università di Trieste
Sara Legovini OGS, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Dipartimento di Oceanografia Biologica
Serena Fonda Umani Dipartimento di Biologia, Università di Trieste

DOI:

https://doi.org/10.3989/scimar.2008.72n199

Palabras clave:

dieta, selectividad alimentaria, gobio transparente, copepodos, mar Adriático

Resumen

En el presente trabajo se estudió la dieta del góbido transparente A. minuta durante la primavera (Mayo 2003) en el nor-oeste del Mar Adriático (Comacchio). El análisis del contenido estomacal mostró que A. minuta es una especie planctívora, que se alimenta exclusivamente de invertebrados pelágicos. Los copépodos calanoides Acartia clausi y Temora longicornis constituyeron las presas dominantes seguidas, en orden de importancia decreciente, de otros copépodos (calanoides y Oncaea spp.), larvas de decápodos, poliquetos y bivalvos. A. minuta evidenció una estrategia alimentaria generalista y un nicho trófico amplio. Los taxones abundantes en el medio natural, A. clausi y T. longicornis, fueron raramente seleccionados, en cambio taxones poco frecuentes, como larvas de poliquetos y decápodos, estuvieron seleccionados positivamente. Atendiendo al cambio en la dieta a lo largo de la ontogenia, los ejemplares de talla pequeña se alimentaron preferentemente de juveniles de T. longicornis y Oncaea spp., mientras los ejemplares de talla mas grande consumían preferentemente A. clausi y calanoides. La relación positiva observada entre el tamaño de la presa y del depredador podría contribuir a atenuar la competencia intraespecífica por los recursos alimenticio.

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