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Providing evidence to improve practice

Individual study: The inter-island translocation of the New Zealand frog Leiopelma hamiltoni

Published source details

Tocher M.D. & Pledger S. (2005) The inter-island translocation of the New Zealand frog Leiopelma hamiltoni. Applied Herpetology, 2, 401-413


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Translocate frogs Amphibian Conservation

A before-and-after study in 1997–2002 of the translocation of 300 Hamilton's frog Leiopelma hamiltoni from Maud Island to Motuara Island, New Zealand (Tocher & Pledger 2005) found that the population established and stabilized. Losses of translocated frogs were offset by new recruits. High mortality and/or dispersal occurred during the first two months, followed by a constant high survival rate (71–100%). New juveniles were found every breeding season from 1998, just 10 months after the translocation. By August 2002, 155 of the translocated frogs and 42 recruits had been (re)captured. New recruits had survival rates of 29–88%. Frogs were toe-clipped and translocated 25 km to the predator free island in May 1997. Frogs were released into a 10 x 10 m grid with initial densities of 3/m2. Frogs were monitored by recapturing within the grid during two sessions of 5–10 nights in 1997 and four sessions in 1998. The grid and a 100 m2 surrounding grid were searched in August 1999–2002.