Modelling the proportion of sardine and anchovy in the diet of Cape gannets: some initial investigations

Cunningham, Carryn L; Butterworth, Doug S

Modelling the proportion of sardine and anchovy in the diet of Cape gannets: some initial investigations

Working Paper

2006

Publisher

University of Cape Town

Department

Marine Resource Assessment and Management Group

Faculty

Faculty of Science

Abstract

The breeding success, and consequently population size, of Cape Gannets has been hypothesised to be strongly dependent on the size of the sardine and anchovy resources in South Africa. The quantification of such relationships is a pre-requisite for attempts to tailor management approaches for these fish resources so as to take adequate account of the needs of predators for which these species provide forage. As a first step towards this end, this document presents the results from some analyses of the relationships between the contributions in percentage (by mass) of sardine and of anchovy in the diet of Cape Gannets to the abundances of these resources.

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