Abstract

SIMONETTI, Pía; FIORI, Sandra M; BOTTE, Sandra E  and  MARCOVECCHIO, Jorge E. Nidificación del Ostrero Común (Haematopus palliatus) en el estuario de Bahía Blanca, Buenos Aires, Argentina. Hornero [online]. 2013, vol.28, n.2, pp.51-58. ISSN 0073-3407.

Nesting of the American Oystercatcher (Haematopus palliatus) in the Bahía Blanca estuary, Argentina.- Several aspects of the reproduction of the American Oystercatcher (Haematopus palliatus) were studied in two areas (continent and islet) in the Bahía Blanca estuary during two consecutive breeding seasons. Laying dates were synchronous in each area and in both years, occurring in a period of 20-30 days. Mean clutch size was similar in both areas, with a mode of two eggs, while nests with three eggs were only found in the islet. Eggs were bigger (larger and more voluminous) in the continent than in the islet. Human disturbance, with a greater impact on the continent, could explain the higher density of pairs and nests found on the islet. Higher plant cover and proximity to the storm line in the islet nests could be associated to the protection of eggs from the potential attacks by predators.

Keywords : American Oystercatcher; Bahía Blanca estuary; Haematopus palliatus; Human disturbance; Nest.

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