INVESTIGADORES
CASAUX Ricardo Jorge
congresos y reuniones científicas
Título:
ON THE ACCURACY OF THE PELLET ANALYSIS METHOD TO ESTIMATE THE FOOD INTAKE IN THE ANTARCTIC SHAG Phalacrocorax bransfieldensis.
Autor/es:
CASAUX R.
Reunión:
Workshop; The CCAMLR Ecosystem Monitoring and Management Working Group; 1997
Resumen:
The
accuracy of correction factors estimated to compensate the digestion and loss
through the gastrointestinal tract of the otoliths of fish represented in
pellets of the Antarctic Shag Phalacrocorax bransfieldensis was
tested at two localities of the South Shetland Islands. For such purpose, the
results from the analysis of 226 and 115 pellets collected at Harmony Point and
at Duthoit Point, respectively, throughout the breeding season were compensated
with the mentioned factors. The estimations indicated that the daily food
intake increased from November to January (pre-laying to late-rearing) and
slightly decreased in February. These estimations, in general, are in line with
those previously obtained for other colonies and/or shags by different methods,
which suggests that the use pellets is an acceptable method to quantify the
diet of the Antarctic Shag.