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Revista mexicana de biodiversidad

On-line version ISSN 2007-8706Print version ISSN 1870-3453

Abstract

MELLINK, Eric. Predation of nocturnal seabirds on islets of Isla Guadalupe, Mexico. Rev. Mex. Biodiv. [online]. 2010, vol.81, n.2, pp.505-509. ISSN 2007-8706.

In early June 2000 we surveyed 3 islets at the southern end of Isla Guadalupe, Mexico: Islote de Afuera (or Islote Zapato), Islote de Adentro (or islote Toro), and Islote Negro, to document nesting seabirds. We found vestiges of over 100 Leach's Storm-petrels (Oceanodroma leucorhoa), 31 Xantus Murrelets (Synthliboramphus hypoleuca), and 1 Cassin's Auklet (Ptychoramphus aleuticus) that had been depredated. The evidences point to Burrowing Owls (Athene cunicularia) as the predator of the storm-petrels, but, because of its size, probably other birds were involved in murrelet and auklet predation. Based on the characteristics of the remains, the depredated Leach Storm-petrels belonged to the population that had nested during the previous winter. The information is not sufficient to determine whether such predation represents a conservation problem for small seabirds on Isla Guadalupe, but suggest that the issue should be studied further.

Keywords : Oceanodroma leucorhoa; Athene cunicularia; Synthliboramphus hypoleuca; Ptychoramphus aleuticus.

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