INVESTIGADORES
CASAUX Ricardo Jorge
artículos
Título:
Diet of the Imperial Cormorant Phalacrocorax atriceps: comparison of pellets and stomach contents.
Autor/es:
CASAUX R,; FAVERO, M.; CORIA N.; SILVA, P.
Revista:
Marine Ornithology
Editorial:
Pacific seabird group
Referencias:
Año: 1997 vol. 25 p. 1 - 4
ISSN:
1018-3337
Resumen:
A
total of 45 pellets from the Imperial Cormorant or Blue-eyed Shag Phalacrocorax
atriceps was collected in January 1994 at Duthoit Point, Nelson Island,
South Shetland Islands. The analysis showed fish as the main prey, followed by
octopods, polychaetes and gastropods. Notothenia coriiceps formed the bulk
of the diet, but Harpagifer antarcticus was the most frequent and important fish
in number. The prey represented in the pellets were consistent with those
observed in stomach contents sampled simultaneously in the same colony;
however, they differed in importance. A daily mean of 0.7 pellets per bird was
collected, representing 255 g
of fish. Correction factors previously estimated in a feeding trial were
applied to this value, and suggested that the average daily amount of food
ingested by an adult cormorant during the sampling period was 1325 g, which fall into the
range observed by the analysis of stomach contents. Other aspects related to
the feeding behaviour of this bird are also discussed.