Impacts of between-island translocations on the breeding success of 'resident' and translocated takahe Porphyrio hochstetteri on four offshore islands in New Zealand
Published source details
Jamieson I.G. & Wilson G.C. (2003) Immediate and long-term effects of translocations on breeding success in takahe Porphyrio hochstetteri. Bird Conservation International, 13, 299-306
Published source details Jamieson I.G. & Wilson G.C. (2003) Immediate and long-term effects of translocations on breeding success in takahe Porphyrio hochstetteri. Bird Conservation International, 13, 299-306
This study is summarised as evidence for the following.
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An analysis of takahe Porphyrio hochstetteri breeding records from four offshore predator-free islands in New Zealand during 1991–2000 (Jamieson & Wilson 2003) found that all eleven translocated birds survived the journey and attempted to breed. There were no differences in age of first breeding attempt between translocated birds of either sex compared with birds born on the islands (2.3-2.6 years old for six male and five female translocated birds vs. 2.1-2.9 for ten male and 11 female resident birds). In addition there were no differences in hatching or fledging rates between pairs containing two, one or no translocated birds (approximately 40% hatching success and 70% fledging success for three pairs of translocated birds vs. 25% and 30% for eight resident pairs and 25% and 30% for five pairs with one resident and one translocated bird). Birds were transferred between Tiritiri Matangi Island, Kapiti Island, Mana Island and Maud Island, and were supplied with supplementary food and kept in pens at the release site for two or three days before release. ‘Resident’ birds were descended from birds that had been translocated from the New Zealand mainland in the past.