Nest site environment of the Black Woodpecker Dryocopus martius in northern Honshu, Japan.

摘要

The environmental features that characterize the nest and roost sites of Dryocopus martius in northern Honshu, Japan, were identified. A vegetation survey was conducted in 2002 and 2003 around each of eight nest sites and three roost sites, where D. martius brooding or roosting behaviour was confirmed visually. Half of the study nest sites showed a convex size-class distribution in which trees with 30-70 cm diameter at breast height were dominant, and the forest floor around the nest sites was not necessarily sparsely vegetated. Results of this study indicate that D. martius in Honshu seem to have broader preferences for environmental conditions of nest and roost sites than considered before.