Study

Ship rat Rattus rattus eradication on Nahkapw Island, Federated States of Micronesia, Pacific Ocean

  • Published source details Wegmann A., Braun J. & Neugarten R. (2008) Ship rat Rattus rattus eradication on Nahkapw Island, Federated States of Micronesia, Pacific Ocean. Conservation Evidence, 5, 18-22

Summary

As part of a larger project attempting to reduce predation pressure from introduced rats Rattus spp. on native fauna and flora on several islands off Pohnpei main island (Pacific Ocean), a rat eradication program was undertaken on the small island of Nahkapw (1.58 ha). Prior to commencement of eradication, a pre-treatment rat population assessment was undertaken; only a single female ship rat R.rattus was caught (subsequently fitted with a radio-collar and released) and wax indicator success was also very low, suggesting that the island hosted a very low density of rats. Bait-stations were positioned on the ground along two transects that ran the length of the island spaced approximately 20 m apart; the distance between the two transects varied but was never less than 10 m or more than 30 m. After 2-weeks of inactivity, these stations were supplemented with 22 bait stations attached to tree trunks adjacent to each ground-based bait station. These tree bait stations were maintained until the radio-collared rat died (25 days after initial bait placement). There was no evidence of non-target species being adversely affected by the bait.

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, 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 18

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 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