Keywords
Bahía Blanca estuary
breeding season
diet
Kelp Gull
Larus dominicanus
Abstract
The Kelp Gull (Larus dominicanus) is widely distributed in Argentina. Several authors suggest that the species is expanding its geographic distribution due to its capacity to exploit food resources derived from human activities. This study shows the diet composition of the Kelp Gull during breeding season in a colony of 3114 nests located in the Del Puerto Island, Bahía Blanca estuary, Buenos Aires Province, Argentina. A total of 1024 pellets, five chick regurgitates, and 12 fledgling regurgitates collected between October and December 2003 were analyzed. A total of 39 prey categories were recorded, being grains (mainly sunflower) and cattle carrion the most important items (54.6% and 29.0%, respectively). These prey items are available in large quantities in the proximity of the colony, which could favour the population increase observed in the last years. Fishes, marine snails, insects, barnacles, garbage, chitons, mussels, clams, and rodents were also observed. Gulls from this colony, as in other colonies along the Patagonian coast, are generalists with a strong tendency to the exploitation of human-derived resources and, to a lesser degree, of seashore preys.
References
BERTELLOTTI M Y YORIO P (1999) Spatial and temporalpatterns in the diet of the Kelp Gull in Patagonia.Condor 101:790–798
BIRDLIFE INTERNATIONAL (2000) Threatened birds of theworld. Lynx Edicions y BirdLife International,Barcelona y Cambridge
BREMEC CS, MARTÍNEZ DE Y ELÍAS R (2004) Asociacionesbentónicas de fondos duros y comunidades incrus-tantes. Pp. 171–178 en: PÍCCOLO MC Y HOFFMEYERMS (eds) El ecosistema del estuario de Bahía Blanca.Instituto Argentino de Oceanografía, Bahía Blanca
BREWER MM Y ARGUELLO NV (1980) Guía ilustrada deinsectos comunes de la Argentina. Instituto Miguel Lillo,Tucumán
BROWN KM Y EWINS PJ (1996) Technique-dependentbiases in determination of diet composition: anexample with Ring-Billed gulls. Condor 98:34–41
BURGER J Y GOCHFELD M (1996) Family Laridae (gulls).Pp. 572–623 en: DEL HOYO J, ELLIOTT A Y SARGATAL J(eds) Handbook of the birds of the world. Volume 3.Hoatzin to auks. Lynx Edicions, Barcelona
BURGER J Y SHISLER J (1978) Nest-site selection andcompetitive interactions of Herring and Laughinggulls in New Jersey. Auk 95:252–266
CANEVARI M, CANEVARI P, CARRIZO GR, HARRIS G,RODRIGUEZ MATA J Y STRANEK RJ (1991) Nueva guía delas aves argentinas. Fundación Acindar, Buenos Aires
CASTELLANOS ZA (1967) Catálogo de los moluscos ar-gentinos y de aguas vecinas al estrecho de Magalla-nes. Revista del Museo de la Universidad de La Plata(Nueva Serie), Sección Zoología 6:465–486
DELHEY JKV Y PETRACCI PF (2004) Aves marinas ycosteras. Pp. 203–220 en: PÍCCOLO MC Y HOFFMEYERMS (eds) El ecosistema del estuario de Bahía Blanca.Instituto Argentino de Oceanografía, Bahía Blanca
DELHEY JKV, PETRACCI PF Y GRASSINI C (2001) Hallaz-go de una nueva colonia de la Gaviota CangrejeraLarus atlanticus en la ría de Bahía Blanca. Hornero16:39–42
DUFFY DC Y JACKSON S (1986) Diet studies of seabirds:a review of methods. Colonial Waterbids 9:1–17
ELÍAS R (1985) Macrobentos del estuario de la bahíaBlanca (Argentina). I: mesolitoral. Spheniscus 1:1–33
ELÍAS R, IRIBARNE O, BREMEC CS Y MARTÍNEZ DE (2004)Comunidades bentónicas de fondos blandos. Pp.179–190 en: PÍCCOLO MC Y HOFFMEYER MS (eds) Elecosistema del estuario de Bahía Blanca. Instituto Ar-gentino de Oceanografía, Bahía Blanca
FAVERO M Y SILVA MP (1998) How important arepelagic preys for the Kelp Gull during chick-rear-ing at the South Shetland Islands? Polar Biology19:32–36
GIACCARDI M, YORIO P Y LIZURUME ME (1997) Patro-nes estacionales de abundancia de la Gaviota Coci-nera (Larus dominicanus) en un basural patagónicoy sus relaciones con el manejo de residuos urbanosy pesqueros. Ornitología Neotropical 8:77–84
GOSZTONYI AE Y KUBA L (1996) Atlas de huesoscraneales y de la cintura escapular de peces costerospatagónicos. Informes Técnicos del Plan de Manejo In-tegrado de la Zona Costera Patagónica – FundaciónPatagonia Natural 4:1–29
QUINTANA F Y YORIO P (1998) Competition for nestsites between Kelps Gulls (Larus dominicanus) andterns (Sterna maxima and S. eurygnatha) in Patagonia.Auk 115:1068–1071
RÁBANO D, GARCÍA BORBOROGLU P Y YORIO P (2002)Nueva localidad de reproducción de la Gaviota deOlrog (Larus atlanticus) en la provincia de BuenosAires, Argentina. Hornero 17:105–107
SILVA MP, BASTIDA O Y DARRIEU CA (2000) Ecologíatrófica de la Gaviota Cocinera (Larus dominicanus)en zonas costeras de la provincia de Buenos Aires.Ornitología Neotropical 11:331–339
VOLPEDO AV Y ECHEVERRÍA DD (2000) Catálogo y clavesde otolitos para la identificación de peces del Mar Argen-tino. I. Peces de importancia económica. EditorialDunken, Buenos Aires
WELHAM CVJ (1987) Diet and foraging behavior ofRing-billed gulls breeding at Dog lake, Manitoba.Wilson Bulletin 99:233–239
YORIO P Y BERTELLOTTI M (2002) Espectro trófico dela Gaviota Cocinera (Larus dominicanus) en tresáreas protegidas de Chubut, Argentina. Hornero17:91–95
YORIO P, BERTELLOTTI M, GANDINI P Y FRERE E (1998a)Kelp Gulls Larus dominicanus breeding on the Ar-gentine coast: population status and relationshipwith coastal management and conservation. MarineOrnithology 26:11–18
YORIO P, FRERE E, GANDINI P Y HARRIS G (1998b) Atlasde la distribución reproductiva de aves marinas en el li-toral patagónico argentino. Fundación Patagonia Na-tural y Wildlife Conservation Society, Buenos Aires
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