The feeding ecology of <em>Aphanius fasciatus</em> (Valenciennes, 1821) in the lagoonal system of Messolongi (western Greece)

Ioannis Leonardos

doi:10.3989/scimar.2008.72n2393

Autores/as

Ioannis Leonardos Biological Applications and Technology Department, University of Ioannina

DOI:

https://doi.org/10.3989/scimar.2008.72n2393

Palabras clave:

Aphanius fasciatus, estrategia alimentaria, variación intraespecífica, ecología alimentaria, laguna

Resumen

El fartet sudeuropeo Aphanius fasciatus (Valenciennes, 1821) es un pez de pequeño tamaño, omnívoro, que habita en zonas estuarinas. Su dieta está constituida principalmente por juveniles del camarón Palaemon adspersus, isópodos, braquiópodos, bivalvos, huevos de invertebrados, mosquitos (huevos y larvas) y diatomeas. Se observó un cambio ontogénico en la dieta, incrementándose de la talla media de las presas con la longitud del pez, de manera que los ejemplares de menor tamaño se alimentan de presas planctónicas (ej. copépodos, ostrácodos, nauplii de Artemia), mientras que los de mayor tamaño prefieren presas más grandes y con mayor afinidad bentónica (ej. anfípodos, bivalvos). La dieta de A. fasciatus muestra una marcada variación estacional, con una reducción en la alimentación durante los períodos de adversas condiciones ambientales (invierno y otoño). Se trata de una especie estuarina bien adaptada, sus preferencias y forma de alimentación dependen de las presas disponibles. La estrategia de alimentación de A. fasciatus se caracteriza por la especialización en distintos tipos de recursos (invertebrados acuáticos, mosquitos) y una elevada BPC (between phenotype component) respecto a la amplitud del nicho, con individuos especializados entre los que el solapamiento en el uso del recurso es escaso o nulo.

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