Conservation Evidence strives to be as useful to conservationists as possible. Please take our survey to help the team improve our resource.

Providing evidence to improve practice

Individual study: The effect of nest box provision on reproductive output of common goldeneye Bucephala clangula in southern Finland

Published source details

Pöysä H. & Pöysä S. (2002) Nest-site limitation and density dependence of reproductive output in the common goldeneye Bucephala clangula : implications for the management of cavity-nesting birds. Journal of Applied Ecology, 39, 502-510

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

Provide artificial nesting sites for wildfowl Bird Conservation

A replicated and controlled before-and-after study in southern Finland in 1988-99 (Pöysä & Pöysä 2002) found that the number of common goldeneye Bucephala clangula breeding pairs increased on 35 lakes following the provision of 50 nest boxes (average of 0.8 pairs/lake in 1988-91, before nest box provision vs. 1.1 pairs/lake in 1995-99, afterwards). There were no increases on 17 lakes without nest boxes provided (average of 0.8 pairs/lake in 1988-91 vs. 0.9 pairs/lake in 1995-9). However, there was no increase in the number of broods at experimental lakes (0.17 broods/lake vs. 0.19 broods/lake) and the increase in the number of chicks fledging was not significant (0.59 young fledged/lake in 1988-91 vs. 0.86 young/lake in 1995-9). Nest boxes were 25 x 26 x 70 cm with a 9 cm diameter entrance hole. The authors suggest nest site availability may limit the number of breeding goldeneyes, but that other factors appear to limit reproductive output.