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Titre du document / Document title

Temporal patterns in the diet and food partitioning in imperial cormorants (Phalacrocorax atriceps) and rock shags (P. magellanicus) breeding at Bahía Bustamante, Argentina

Auteur(s) / Author(s)

PUNTA Gabriel (1) ; YORIO Pablo (2) ; HERRERA Gonzalo (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Dirección General de Intereses Marítimos y Pesca Continental, 9 de Julio y J. A. Roca, 9103, Rawson, Chubut, ARGENTINE
(2) Centro Nacional Patagónico (CONICET) and Wildlife Conservation Society, Boulevard Brown s/n, 9120, Puerto Madryn, Chubut, ARGENTINE

Résumé / Abstract

We studied the diet of Imperial Cormorants (Phalacrocorax atriceps) and Rock Shags (P. magellanicus) at Bahía Bustamante, Argentina, between 1992 and 1994. We analyzed pellet casts (1887 from Imperial Cormorants and 799 from Rock Shags) and regurgitations of stomach contents (260 from Imperial Cormorants and 24 from Rock Shags). Imperial Cormorants and Rock Shags fed on at least 22 and 21 different types of prey, respectively. The main prey species during all study years were fish: Engraulis anchoita for Imperial Cormorants and Patagonothen sp. for Rock Shags. For both species, the consumption of the main food categories as estimated by pellet analysis was similar among years. A significant relationship was found between Imperial Cormorant and Rock Shag diets during the three years, while the diet overlap index was relatively high. During all years, Imperial Cormorants consumed a significantly larger proportion of pelagic or demersal fish than did Rock Shags, while Rock Shags consumed benthic fish in a greater proportion than did Imperial Cormorants. Mean maximum diving depth, determined using capillary tube depth gauges, of Imperial Cormorants (24.4 m ± 18.8 SD) was significantly greater but more variable than that of Rock Shags (9.3 m ± 4.1 SD).

Revue / Journal Title

The Wilson bulletin    ISSN  0043-5643   CODEN WILBAI 

Source / Source

2003, vol. 115, no3, pp. 307-315 [9 page(s) (article)] (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Wilson Ornithological Society, Lawrence, KS, ETATS-UNIS  (1894) (Revue)

Mots-clés anglais / English Keywords

Feeding

;

Vertebrata

;

America

;

South America

;

Phalacrocorax aristotelis

;

Phalacrocorax carbo

;

Aves

;

Argentina

;

Reproduction

;

Food

;

Diet

;

Mots-clés français / French Keywords

Phalacrocoracidae

;

Alimentation

;

Vertebrata

;

Amérique

;

Amérique du Sud

;

Phalacrocorax atriceps

;

Phalacrocorax aristotelis

;

Phalacrocorax carbo

;

Aves

;

Argentine

;

Reproduction

;

Aliment

;

Régime alimentaire

;

Mots-clés espagnols / Spanish Keywords

Alimentación

;

Vertebrata

;

America

;

America del sur

;

Phalacrocorax aristotelis

;

Phalacrocorax carbo

;

Aves

;

Argentina

;

Reproducción

;

Alimento

;

Régimen alimentario

;

Localisation / Location

INIST-CNRS, Cote INIST : 5181, 35400011714491.0130

Nº notice refdoc (ud4) : 15675130



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