INVESTIGADORES
ALARCON Pablo Angel Eduardo
artículos
Título:
The unexpected diet of breeding Imperial Shags (Phalacrocorax atriceps) at the Nahuel Huapi lake, Patagonia: Implications on population trends?
Autor/es:
CASAUX, R; BERTOLÍN, ML; TARTARA MA; ALARCÓN, P; PORRO, G
Revista:
ORNITOLOGIA NEOTROPICAL
Editorial:
NEOTROPICAL ORNITHOLOGICAL SOC
Referencias:
Lugar: ALEMANIA; Año: 2010 vol. 21
ISSN:
1075-4377
Resumen:
The diet of the Imperial Shag (Phalacrocorax atriceps) was evaluated based on the analysis of 59 pellets (regurgitated cast) collected in the breeding season 2007-2008 at the colony in Punta Sur of the Nahuel Huapi lake (NHL). Throughout our study, the crustaceans Samastacus spinifrons and Aegla sp. were by far the most important prey, whereas fish (Oncorynchus mykiss and Salmo trutta) only occasionally occurred. Although our results are in line with previous reports of the diet of the population at NHL, this is the first study indicating that breeding shags forage almost exclusively on invertebrates. Possibly, a diet mainly based in this kind prey is not meeting the energetic requirements of these birds, affecting the chick food provisioning and, consequently, the Imperial Shag?s population trend.
