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dc.contributor.author Smith, David G en_US
dc.contributor.author Polhemus, John T en_US
dc.contributor.author VanderWerf, Eric A en_US
dc.date.accessioned 2008-09-24T07:09:12Z en_US
dc.date.available 2008-09-24T07:09:12Z en_US
dc.date.issued 2002-10 en_US
dc.identifier.citation Smith DG, Polhemus JT, VanderWerf EA. 2002. Comparison of managed and unmanaged Wedge-Tailed Shearwater colonies on O'ahu: effects of predation. Pac Sci 56(4): 451-457. en_US
dc.identifier.issn 0030-8870 en_US
dc.identifier.uri http://hdl.handle.net/10125/2630 en_US
dc.description.abstract On O'ahu, Wedge-tailed Shearwaters (Puffinus pacifieus) and other seabirds nest primarily on small offshore islets, but fossil evidence shows that many seabirds formerly bred on O'ahu itself. Predation by introduced mammals is suspected to be the primary factor preventing shearwaters and other seabirds from reestablishing large nesting colonies on O'ahu. We investigated the effects of predation on Wedge-tailed Shearwaters by comparing three small unmanaged colonies at Malaekahana State Recreation Area on O'ahu, where feral cats are fed by the public, with a large managed colony at nearby Moku'auia Island State Seabird Sanctuary, where predators are absent. During three visits on 19 April, 16 June, and 23 October 2000, we located 69 occupied burrows in three colonies at Malaekahana and 85 occupied burrows in four monitoring plots at Moku'auia. Many more nests produced chicks at Moku'auia (62 %) than at Malaekahana (20%). Among plots at Malaekahana, reproductive success was lowest (zero) at the colony closest to the cat feeding site. In addition, 44 adult shearwater carcasses were found at Malaekahana near the cat feeding site. Predation, most likely by cats attracted to supplemental food, had a devastating impact on shearwaters at Malaekahana. At one colony there was complete reproductive failure and almost all adults were killed. Populations of long-lived species like seabirds are sensitive to adult mortality, and Malaekahana may act as a sink, draining birds away from other areas. en_US
dc.language.iso en-US en_US
dc.publisher University of Hawai'i Press en_US
dc.title Comparison of Managed and Unmanaged Wedge-Tailed Shearwater Colonies on O'ahu: Effects of Predation en_US
dc.type Article en_US
dc.type.dcmi Text en_US

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