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Providing evidence to improve practice

Individual study: Population growth of a reintroduced population of North Island saddlebacks Philesturnus rufusater on Mokoia Island (Lake Rotorua), Bay of Plenty, New Zealand

Published source details

Armstrong D.P., Davidson R.S., Perrott J.K., Roygard J. & Buchanan L. (2005) Density-dependent population growth in a reintroduced population of North Island saddlebacks. Journal of Animal Ecology, 74, 160-170


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

Translocate songbirds Bird Conservation

A before-and-after study on Mokoia Island (135 ha) in Lake Rotorua, North Island, New Zealand (Armstrong et al. 2005), found that a population of saddlebacks Philesturnus carunculatus (referred to as North Island saddlebacks P. rufusater) reintroduced onto the island increased from the 36 birds released in April 1992 to 217 birds in September 1996. The population fell following the attempted eradication of mice but recovered to 200 by September 1997. Reproductive output declined over time as the population grew. Before birds were released, brown rats Rattus norvegicus were eradicated from the island.