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Providing evidence to improve practice

Individual study: Removal of feral cats Felis catus to reduce black-vented shearwater Puffinus opisthomelas mortality on Natividad Island, Baja California Sur, Mexico

Published source details

Keitt B.S. & Tershy B.R. (2003) Cat eradication significantly decreases shearwater mortality. Animal Conservation, 6, 307-308


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Control mammalian predators on islands for seabirds Bird Conservation

A replicated before-and-after study on Natividad Island (7.4 ha), Baja California Sur, Mexico (Keitt & Tershy 2003), found that mortality rates of black-vented shearwaters Puffinus opisthomelas in four survey plots fell by 90%, from 7.4 carcasses/month (April-July 1997) to 0.7 carcasses/month (March-June 2002) following the eradication of feral cats Felis catus from the island. Extrapolated to the entire colony, this suggests a decrease in mortality from over 1,000 birds/month to fewer than 90 birds/month, with each of 25 cats killing approximately 37 birds/month.