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Title: Kleptoparasitism, disturbance and predation of yellow-legged gulls on Audouin's gulls in three colonies of the western Mediterranean
Author: Martínez Abraín, Alejandro
González-Solís, Jacob
Pedrocchi Rius, Vittorio
Genovart Millet, Meritxell
Abella, Joan Carles
Ruiz Gabriel, Xavier
Jiménez Pérez, Juan. 1958-
Oro, Daniel
Keywords: Gavines
Predació (Biologia)
Ebre, Delta de l' (Catalunya)
Chafarinas (Espanya)
Columbrets (País Valencià)
Predation (Biology)
Ebro River Delta (Catalonia)
Chafarinas Islands (Spain)
Columbretes Islands (Valencian Community)
Issue Date: 2002
Publisher: Consejo Superior de Investigaciones Científicas (CSIC)
Abstract: The impact of yellow-legged gulls on Audouin´s gulls was studied by means of observations from a blind, at the Ebro Delta, the Chafarinas Islands and the Columbretes Islands colonies, during different stages of Audouin´s Gulls breeding cycle. The rates of predation (upon eggs and chicks) and kleptoparasitism (aerial and on courtship and chick-feeding regurgitates) were recorded to evaluate this impact. Kleptoparasitism and predation rates recorded at the three colonies may be considered low when compared with similar studies dealing with other gull species. It seems that interactions did not represent a threat to the population dynamics of Audouin´s Gulls in any of the three colonies. The highest rates of aerial kleptoparasitism, courtship feeding and chick mortality were recorded at the Columbretes Islands, and the lowest at the Ebro Delta. The ratio of the number of yellow-legged gulls to the number of Audouin´s gulls seems to influence the rate of disturbances. Food availability was also likely to play an important role in the number of interactions, which increased when food was in shorter supply. The study at the Ebro Delta and Chafarinas Islands was restricted to some subcolonies and hence results may not be necessarily representative of the entire colonies. The existence of some yellow-legged gull individuals specialised as predators was recorded. Finally, we discuss the suitability of several conservation measures commonly applied in colonies where both species breed syntopically.
Note: Reproducció del document publicat a:
It is part of: Scientia Marina, 2002, vol. 67, num. Suppl. 2, p. 89-94
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ISSN: 0214-8358
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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