Social foraging behavior of the Olrog's Gull (Larus atlanticus)

ZUMPANO FRANCISCO; CASTANO MELINA; NICOLLI ANABELLA; GARCÍA GERMAN OSCAR

Puerto Iguazú

Congreso; Ornithological Congress of the Americas; 2017

Aves Argentinas, Sociedade Brasileira de Ornitologia, Association of Field Ornithologists,

Different studies have analyzed the trophic behaviour of the Olrog´s Gull (Larus atlanticus). However, the sex and foraging group size effects have not been evaluated yet. During 2016 (non-breeding season) 171 focal samplings of marked individuals (n=20) were performed at Mar Chiquita Reserve (37°46´ S, 57°27´ W). A total of 426 prey were registered (more than 80% of the items were identified as the burrowing crab Neohelice granulata). The crab?s size consumed differed from an uniform distribution (χ23=62.23, P