INVESTIGADORES
CASAUX Ricardo Jorge
artículos
Título:
Diet of the Neotropic Cormorant Phalacrocorax olivaceus at West Chubut, Patagonia, Argentina
Autor/es:
CASAUX R.; DI PRINZIO C.; BERTOLIN M.; TARTARA A.
Revista:
WATERBIRDS (DE LEON SPRINGS, FLA.)
Editorial:
WATERBIRD SOC
Referencias:
Año: 2009 vol. 32 p. 444 - 449
ISSN:
1524-4695
Resumen:
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A total of 124
pellets (regurgitated casts) produced by the Neotropic Cormorant (Phalacrocorax
olivaceus) were collected monthly
between January 2004 and November 2005 from a roosting site at Rosario Lake
Chubut, Patagonia, Argentina. Analyses of the samples showed that fish were the
most frequent and important prey by number, followed by crustaceans and molluscs.
The three fish species inhabiting Rosario
Lake were represented in
the diet which suggests that this bird is a generalist feeder. However,
cormorants positively selected for Patagonian Silverside and Rainbow Trout,
which might be related to their foraging strategy and/or to the conspicuousness
of potential prey. The estimated annual fish intake by cormorants at Rosario Lake ranged between 2.3 and 3.7 tons of
fish and between 16,000 and 26,000 individuals.
The impact produced by the Neotropic Cormorant on recreational fish resources
and to the local fish farm is negligible.
