Cat eradication significantly decreases shearwater mortality

  • 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 following.

Action Category

Control mammalian predators on islands for seabirds

Action Link
Bird Conservation
  1. Control mammalian predators on islands for seabirds

    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.


Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 21

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape ProgrammeRed List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Mauritian Wildlife Supporting Conservation Leaders
Sustainability Dashboard National Biodiversity Network Frog Life The international journey of Conservation - Oryx Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered species Vincet Wildlife Trust