INVESTIGADORES
GARCIA german oscar
congresos y reuniones científicas
Título:
Sex and group size variability affecting the foraging behavior of Olrog's gull (Larus atlanticus)
Autor/es:
ZUMPANO FRANCISCO; CASTANO MELINA; FAVERO MARCO; GARCÍA GERMÁN OSCAR
Reunión:
Conferencia; 3rd World Seabird Conference; 2021
Resumen:
The Olrog?s Gull (Larus atlanticus) is endemic to the Atlantic coast of southern South America and a species regionally listed as threatened, with the bulk of its diet comprised by crabs, at least in breeding sites and some non-modified wintering areas. Here we evaluate the effect of the group size and sex variability on the foraging behavior of wild immature gulls during the non-breeding season in Mar Chiquita coastal lagoon, Argentina. Birds were captured, sexed and banded during the 2016 non-breeding season. Foraging behavior was quantified by focal observations made on banded individuals, the size of the foraging group, and the size and type of preys were recorded. Foraging parameters estimated were (1) foraging effort (capture attempts per minute), (2) capture rate (prey obtained per minute), and (3) foraging efficiency (consumed biomass per minute). Males spent more time performing agonistic behavior than females (GLMM: z=2.43, p