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

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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 ligh...

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Autores principales: Leopold, Mardik F., Philippart, Catharina J.M., Yorio, Pablo
Lenguaje:Inglés
Publicado: 2010
Materias:
DIETA
INVERTEBRADOS MARINOS
NICHO DE ILUMINACION NOCTURNA
PATAGONIA
AVES MARINAS
SEABIRDS
DIET
MARINE INVERTEBRATES
NIGHT LIGHT NICHE
Acceso en línea:https://hdl.handle.net/20.500.12110/hornero_v025_n02_p055
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:hornero_v025_n02_p055
record_format dspace
spelling todo:hornero_v025_n02_p0552023-10-03T13:49:28Z Nocturnal feeding under artificial light conditions by Brown-hooded Gull (Larus maculipennis) in Puerto Madryn harbour (Chubut Province, Argentina) Alimentación nocturna bajo iluminación artificial de la gaviota Capucho café (Larus maculipennis) en el muelle de Puerto Madryn (Chubut, Argentina) Leopold, Mardik F. Philippart, Catharina J.M. Yorio, Pablo DIETA INVERTEBRADOS MARINOS NICHO DE ILUMINACION NOCTURNA PATAGONIA AVES MARINAS SEABIRDS DIET MARINE INVERTEBRATES NIGHT LIGHT NICHE 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. Se describe la alimentación nocturna en un ambiente marino de la Gaviota Capucho Café (Larus maculipennis) en noviembre de 2009. Las gaviotas se congregaron durante la noche en el extremo de un muelle de 800 m de extensión en Puerto Madryn (Chubut, Argentina). Las aguas alrededor del extremo del muelle estaban iluminadas por potentes luces que atraían a muchas presas pequeñas a la superficie. Varios cientos de gaviotas, presumiblemente individuos reproductivos provenientes de una colonia cercana, se alimentaron diariamente en este sitio usando diferentes técnicas de alimentación y capturando presas de diferentes especies y tallas. Las presas potenciales fueron capturadas para su identificación a través de muestreos verticales con una red de plancton. Las presas que seguramente capturaron las gaviotas eran Isopoda de tamaño relativamente grande (Idothea sp.), Polychaeta (Platynereis sp.) y larvas de peces (Patagonotothen sp.), así como crustáceos de menor tamaño, mayormente Amphipoda (Phoxocephalidae) y Mysidacea. Las presas pequeñas fueron capturadas mientras las gaviotas nadaban, mediante el picoteo en superficie, mientras que las más grandes fueron capturadas sobrevolando bajo sobre la superficie y a través de zambullidas superficiales. Durante el día, solo unas pocas gaviotas se aventuraron dentro de la bahía, indicando que tomaron ventaja de la oportunidad de alimentación nocturna facilitada por la iluminación artificial. La clara ganancia a corto plazo de la explotación de esta novedosa oportunidad de alimentación podría ser compensada por posibles amenazas tales como una mayor vulnerabilidad a los predadores o la contaminación por derrame de hidrocarburos de los barcos amarrados junto al muelle. 2010-12-20 PDF Inglés info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar https://hdl.handle.net/20.500.12110/hornero_v025_n02_p055
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv Inglés
topic DIETA
INVERTEBRADOS MARINOS
NICHO DE ILUMINACION NOCTURNA
PATAGONIA
AVES MARINAS
SEABIRDS
DIET
MARINE INVERTEBRATES
NIGHT LIGHT NICHE
spellingShingle DIETA
INVERTEBRADOS MARINOS
NICHO DE ILUMINACION NOCTURNA
PATAGONIA
AVES MARINAS
SEABIRDS
DIET
MARINE INVERTEBRATES
NIGHT LIGHT NICHE
Leopold, Mardik F.
Philippart, Catharina J.M.
Yorio, Pablo
Nocturnal feeding under artificial light conditions by Brown-hooded Gull (Larus maculipennis) in Puerto Madryn harbour (Chubut Province, Argentina)
topic_facet DIETA
INVERTEBRADOS MARINOS
NICHO DE ILUMINACION NOCTURNA
PATAGONIA
AVES MARINAS
SEABIRDS
DIET
MARINE INVERTEBRATES
NIGHT LIGHT NICHE
description 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.
author Leopold, Mardik F.
Philippart, Catharina J.M.
Yorio, Pablo
author_facet Leopold, Mardik F.
Philippart, Catharina J.M.
Yorio, Pablo
author_sort Leopold, Mardik F.
title Nocturnal feeding under artificial light conditions by Brown-hooded Gull (Larus maculipennis) in Puerto Madryn harbour (Chubut Province, Argentina)
title_short Nocturnal feeding under artificial light conditions by Brown-hooded Gull (Larus maculipennis) in Puerto Madryn harbour (Chubut Province, Argentina)
title_full Nocturnal feeding under artificial light conditions by Brown-hooded Gull (Larus maculipennis) in Puerto Madryn harbour (Chubut Province, Argentina)
title_fullStr Nocturnal feeding under artificial light conditions by Brown-hooded Gull (Larus maculipennis) in Puerto Madryn harbour (Chubut Province, Argentina)
title_full_unstemmed Nocturnal feeding under artificial light conditions by Brown-hooded Gull (Larus maculipennis) in Puerto Madryn harbour (Chubut Province, Argentina)
title_sort nocturnal feeding under artificial light conditions by brown-hooded gull (larus maculipennis) in puerto madryn harbour (chubut province, argentina)
publishDate 2010
url https://hdl.handle.net/20.500.12110/hornero_v025_n02_p055
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AT philippartcatharinajm nocturnalfeedingunderartificiallightconditionsbybrownhoodedgulllarusmaculipennisinpuertomadrynharbourchubutprovinceargentina
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