Predation by the Western Gull on the Eared Grebe at a Salina in Mexico

Julio Cesar Peralta-Gallegos; Aradit Castellanos-Vera; Alfredo Ortega-Rubio

doi:10.1675/1524-4695(2004)027[0483:PBTWGO]2.0.CO;2

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Julio Cesar Peralta-Gallegos,¹ Aradit Castellanos-Vera,¹ Alfredo Ortega-Rubio¹

¹Centro de Investigaciones Biológicas del Noroeste, Mar Bermejo #195, Col. Playa Palo de Santa Rita, 23090 La Paz, Baja California Sur, Mexico aortega@cibnor.mx

Abstract

We studied the predation of the Western Gull (Larus occidentalis) on the Eared Grebe (Podiceps nigricollis) from December 2002 to June 2003 at a solar saltworks. Mechanisms of predatory behavior, such as use of perching site, attack maneuvers and killing and catching grebes, as well as behavior of the grebes as a response to the presence and attacks by gulls, were recorded. In all 35 cases where a gull attempt to feed was seen, it was successful in every case. This is the first report about predation by the Western Gull on the Eared Grebe.

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Julio Cesar Peralta-Gallegos, Aradit Castellanos-Vera, and Alfredo Ortega-Rubio "Predation by the Western Gull on the Eared Grebe at a Salina in Mexico," Waterbirds 27(4), 483-485, (1 December 2004). https://doi.org/10.1675/1524-4695(2004)027[0483:PBTWGO]2.0.CO;2

Received: 20 October 2003; Accepted: 10 May 2004; Published: 1 December 2004

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Eared Grebe

Larus occidentalis

Podiceps nigricollis

predation

predation efficiency

predatory behavior

salina

saltworks

Western Gull

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