INVESTIGADORES
CASAUX Ricardo Jorge
congresos y reuniones científicas
Título:
The diet of the blue-eyed shag Phalacrocorax atriceps during summer at Nelson Island, Antarctica: Temporal variations and consumptions rates
Autor/es:
FAVERO, M.; CASAUX R.; SILVA, P.; BARRERA-ORO E.; CORIA N.
Reunión:
Workshop; The CCAMLR Ecosystem Monitoring and Management Working Group; 1995
Resumen:
One hundred and thirty nine
stomach contents of the blue-eyed shag Phalacrocorax atriceps were sampled
at Nelson Island, Antarctica, between 1 December 1994 and 2 February 1995. Fish
were by far the main prey, followed by octopods, gammarids, euphausiids and
polychaetes. Notothenia coriiceps, predominated in frequency (56%) and in
mass (55%), whereas Harpagifer antarcticus was the most important by number (60%).
The mean mass of the stomach contents was 220 g, whereas the mean number of
fish was 7.4 (range 1-34). Eight hundred and sixty four bird h-1 of
observations on 5-7 nests showed that the adults averaged 1.7 trips day-1
during incubation, 2.0 trips day-1
in early rearing and 4.6 trips day-1 during late rearing period. The
estimated daily intakes reached 352, 462 and 1017 g respectively.