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Providing evidence to improve practice

Individual study: Post-release survival and breeding success of captive-bred puaiohi Myadestes palmeri released in the Alaka'i Wilderness Preserve, Kaua'i, Hawaii, USA

Published source details

Tweed E.J., Foster J.T., Woodworth B.L., Monahan W.B., Kellerman J.L. & Lieberman A. (2006) Breeding biology and success of a reintroduced population of the critically endangered puaiohi (Myadestes palmeri). The Auk, 123, 753-763

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

Release captive-bred individuals into the wild to restore or augment wild populations of songbirds Bird Conservation

A continuation of the programme described in Tweed et al. 2003, found that 91% of 21 female and 13 male puaiohi Myadestes palmeri released between 1999 and 2001 survived to independence (defined as 30 days after release) (Tweed et al. 2006). Seventy-five percent of 12 birds monitored for longer survived the next 50 days. All 12 birds (ten female, two male) monitored during the breeding season had active nests, with 31 nests being built over two years by the ten females and 28 becoming active. The fate of 24 nests was known, with 42% fledging at least one young and 38% being predated (probably by rats). Clutch size (average of 2 eggs/nest, 16 nests), daily survival rates (97%) and fledglings/successful nest (1.4 fledglings/nest, ten nests) were similar for released and wild birds, although fewer fledglings/active nest were produced (0.58 fledglings/nest vs. 1.1 fledglings/nest). Release techniques were the same as in (3), but food was provided for up to 30 days.