Control of invasive black rats Rattus rattus appears to lead to population recovery in a reintroduced population of New Zealand robins Petroica australis in a forest 'Mainland Island' on North Island, New Zealand


This study is summarised as evidence for the following.

Action Category

Control predators not on islands for songbirds

Action Link
Bird Conservation
  1. Control predators not on islands for songbirds

    A before-and-after study in a forest remnant in the south of New Zealand’s North Island between September 1999 and September 2004 (Armstrong et al. 2006) found that the population of 40 New Zealand robins Petroica australis (refered to as North Island robins P. longipes) reintroduced to the study site in March 1999 declined to 18 individuals by September 1999 and then to 11 birds by September 2000. Following the control of introduced predators (black rat Rattus rattus and brush-tailed possum Trichosurus vulpecula) with brodifacoum baits between mid-2000 and March 2002, rat populations (measured with tracking tunnels) fell and the robin population increased to 19 birds. Poisoning was stopped in March 2002, the rat population increased and the robin population decreased to eight birds by September 2004.


Output references

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, terrestrial 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 latest volume: Volume 17

Go to the CE Journal

Subscribe to our newsletter

Please add your details if you are interested in receiving updates from the Conservation Evidence team about new papers, synopses and opportunities.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust