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Providing evidence to improve practice

Individual study: Control of a stoat Mustela erminea irruption improves mohua Mohoua ochrocephala breeding success in Eglington Valley, Southland, New Zealand

Published source details

O'Donnell C.F.J., Dilks P.J. & Elliott G.P. (1996) Control of a stoat (Mustela erminea) population irruption to enhance mohua (Mohoua ochrocephala) breeding success in New Zealand. New Zealand Journal of Zoology, 23, 279-286


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

Control predators not on islands for songbirds Bird Conservation

A replicated, controlled, paired sites study in Fiordland, New Zealand, in 1990-3 (O'Donnell et al. 1996) found that mohua (yellowhead) Mohoua ochrocephala nests produced significantly more chicks in a site where stoats Mustela erminea were trapped than in a site without trapping for the first breeding season (1990-1) (80% fledging success, 2.1 fledglings/breeding group for ten groups vs. 36%, 1.1 fledglings/breeding group for 14 groups). In subsequent years, as the stoat population fell, success increased in both areas and the difference between sites became non-significant (87-90% fledging success, 2.6-2.7 fledglings/breeding group for 19 groups at the trapped sites vs. 66-75%, 1.9-2.5 fledglings/breeding group for 15 groups at the untrapped site). A total of 62 stoats were removed from the trapped site in 1990-1.