Friday, June 23, 2017

Landscape-scale trapping of stoats (Mustela erminea) benefits tokoeka (Apteryx australis) in the Murchison Mountains, Fiordland, New Zealand

TitleLandscape-scale trapping of stoats (Mustela erminea) benefits tokoeka (Apteryx australis) in the Murchison Mountains, Fiordland, New Zealand
Publication TypeJournal Article
Year of Publication2016
AuthorsTansell, J, Edmonds, HK, Robertson, HA
JournalNotornis
Volume63
Issue1
Pagination1-8
Type of ArticleFull article
KeywordsApteryx australis, conservation, kiwi, Mustela erminea, population dynamics, predator control, stoat, tokoeka
Abstract

A 15,000 ha low-intensity stoat (Mustela erminea) trapping network was established in the Murchison Mountains in 2002, primarily to protect the last natural population of the critically endangered takahe (Porphyrio hochstetteri). We compared the productivity and survival of threatened southern brown kiwi or tokoeka (Apteryx australis) living in 3 valleys that were covered by this trapping network with those in a nearby valley that was left untreated. Chick survival to 6 months old was significantly higher in the trapped areas (37%) than in the untrapped area (19%). This doubling of chick survival was sufficient to change the rate of population growth, as derived from Leslie matrix analyses, from a projected decline of 1.6% per annum without management to a projected increase of 1.2% per annum with trapping.

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