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Article << Previous     |     Next >>   Contents Vol 112(2)

A recently established Kelp Gull colony in a freshwater environment supported by an inland refuse dump in Patagonia

Martín G. Frixione A F, Ricardo Casaux B C, Cecilia Villanueva D and Pablo A. E. Alarcón E

A Universidad Nacional de la Patagonia San Juan Bosco, Boulevard Brown 3700, U9120ACX Puerto Madryn, Chubut, Argentina.
B Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Rivadavia 1917, Buenos Aires, C1033AAJ, Argentina. Email: pipocasaux@infovia.com.ar
C Instituto Antártico Argentino, Cerrito 1248, Buenos Aires, C1010AAZ, Argentina.
D Centro Nacional Patagónico, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Boulevard Brown 2915, U9120ACV, Puerto Madryn, Chubut, Argentina. Email: villanuevacecilia@yahoo.com.ar
E Universidad Nacional del Comahue, Unidad Postal Universidad, R8400HNT San Carlos de Bariloche, Río Negro, Argentina. Email: paealarcon@gmail.com
F Corresponding author. Email: mfpatagonia@gmail.com

Emu 112(2) 174-178 http://dx.doi.org/10.1071/MU11031
Submitted: 14 April 2011  Accepted: 3 February 2012   Published: 22 May 2012


 
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Abstract

Populations of several species of gull are increasing worldwide as a result of a plentiful supply of anthropogenic food in urbanised environments. In light of this, we decided to examine the importance of anthropogenic food in the diet of a recently established colony of Kelp Gulls (Larus dominicanus). We collected 241 regurgitated pellets of the Kelp Gull during the 2008–09 breeding season at the colony in the De La Guardia Islands, Nahuel Huapi Lake, Argentina. In terms of percentage frequency of occurrence in pellets, human refuse (65.6%) was the most frequently recorded item, followed by insects (42.3%; mostly coleopterans) and fish (21.2%). In terms of the percentage number of total prey items, insects (62.1%) and human refuse (21.3%) were the most abundant items. The consumption of insects decreased and that of human refuse increased during chick-rearing. Human refuse was recorded in samples from most nests (97.3%). We compare our results with those obtained for other localities and discuss the consequences of the management of urban refuse. Our results suggest that the Kelp Gull breeding colony in the De La Guardia Islands is sustained by the availability of food from the rubbish tip of Villa la Angostura. This is the first dietary study of the Kelp Gull in a continental freshwater ecosystem and one more example of a gull colony supported by anthropogenic sources of food.

Additional keywords: diet, human refuse, Larus dominicanus, rubbish tip.


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