Nocturnal feeding under artificial light conditions by Brown-hooded Gull (<i>Larus maculipennis</i>) in Puerto Madryn harbour (Chubut Province, Argentina).

 

Autores
Leopold, Mardik F.; Philippart, Catharina J.M.; Yorio, Pablo
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2010
País
Argentina
Institución
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
Repositorio
Biblioteca Digital (UBA-FCEN)
Descripción
This paper describes nocturnal, marine feeding behaviour in the Brown-hooded Gull (Larus maculipennis) in November 2009. The gulls assembled at night at the end of a long pier, running 800 m offshore into the Golfo Nuevo, at Puerto Madryn, Chubut Province, Argentina. Powerful lights predictably lighted the water around the end of the pier and attracted many small prey animals to the surface. Several hundreds of gulls, presumed to be local breeders, came every night to feed on this bounty, using various feeding techniques and taking several prey species and sizes. Potential prey items were caught to be identified by vertical plankton hauls. The gulls most likely took relatively large Isopoda (Idothea sp.), Polychaeta (Platynereis sp.) and fish larvae (Patagonotothen sp.) as well as smaller crustaceans, mostly Amphipoda (Phoxocephalidae) and Mysidacea. The gulls caught small prey items while swimming, by rapid surface pecking, while they hunted the larger prey species by flying low over the water and performing shallow, vertical plunge-dives. During daylight, only few gulls ventured from land into the bay, indicating that they took advantage of the nocturnal feeding opportunity, facilitated by artificial lighting. The clear short-term gain of exploiting this novel foraging opportunity may be offset by potential threats such as increased vulnerability to predators or contamination by oil spills from ships moored along the pier.
Idioma
inglés
OAI Identifier
snrd:008_ElHornero_v025_n02_articulo055
Enlace del recurso
http://digital.bl.fcen.uba.ar/gsdl-282/cgi-bin/library.cgi?a=d&c=publicaciones/hornero&d=008_ElHornero_v025_n02_articulo055
Nivel de acceso
Acceso abierto
Materia
aves marinas
dieta
invertebrados marinos
nicho de iluminación nocturna
Patagonia
diet
marine invertebrates
night light niche
Patagonia
seabirds