Selection for nest-hole shift and tactics of breeding dispersal in Tengmalm's owl Aegolius funerus

Published source details Korpimaki E. (1987) Selection for nest-hole shift and tactics of breeding dispersal in Tengmalm's owl Aegolius funerus. Journal of Animal Ecology, 56, 185-196.
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This study is summarised as evidence for the following.

	Action	Category
	Provide artificial nesting sites for owls Action Link

Provide artificial nesting sites for owls

A replicated, controlled study in 1979-85 in west Finland (Korpimaki 1987) found that Tengmalm's owls Aegolius funerus nested in nest boxes at least as frequently as natural cavities (3-12% of nest boxes used, depending on design vs. 8.5% of natural cavities). Small boxes (internal diameter <26 cm, entrance holes <15 cm) were used more frequently than larger nest boxes (10-12% of 894 small boxes used vs. 3% of 165 larger boxes). Boxes made from hollowed logs (17-20 cm internal diameter, 8-10 cm entrance hole) and natural cavities were used less than small nest boxes, but not significantly so (7% of 677 log boxes and 9% of 177 natural cavities used). The study area was increased each year of the study, until it reached 1,300 km², with 450 nest sites. A total of 1,736 nest boxes were used and 177 natural cavities searched.