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