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Feeding ecology of Enteroctopus megalocyathus (Cephalopoda: Octopodidae) in southern Chile

Published online by Cambridge University Press:  25 June 2008

Christian M. Ibáñez  and
Javier V. Chong
Christian M. Ibáñez*
Affiliation:
Instituto de Ecología y Biodiversidad, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, PO Box 563, Santiago, Chile
Javier V. Chong
Affiliation:
Departamento de Ecología Costera, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, P.O. BOX 297, Concepción, Chile
*
Correspondence should be addressed to: Christian M. IbáñezInstituto de Ecología y BiodiversidadDepartamento de Ciencias Ecológicas, Facultad de Ciencias Universidad de Chile, PO Box 563, Santiago, Chile email: christianibez@yahoo.com
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Abstract

In this research we studied the diet of Enteroctopus megalocyathus from three principal locations of the octopus fishery (Ancud, Quellón and Melinka) in southern Chile. The gastric contents of 523 individuals, collected between October 1999 and September 2000, were examined and statistically analysed. Diet composition was described using detrended correspondence analysis and analysed as a function of predator gender, body size and fishing area. Food items were found in ~50% of the octopuses examined and a total of 14 prey items were recognized. The diet of E. megalocyathus consisted primarily in brachyuran and anomuran crustaceans, fish and conspecifics. The diet differed in composition between fishing zones and mantle length of the specimens and size of octopuses varied between locations. After adjusting for octopus mantle length, diet composition was found to be different between fishing areas. Large octopuses fed on large crabs at Ancud, while in Quellón and Melinka small octopuses fed mainly on small crustaceans. There were no differences in prey composition between the gender and the size of octopuses was a better predictor of the variance in the diet composition (16%) than the fishing zone (6%). Cannibalism may become an important issue when food is scarce and/or at high population density.

Keywords

dietEnteroctopus megalocyathuscannibalismChile
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 4 , August 2008 , pp. 793 - 798
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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