ジョウビタキの巣の構造と材料

抄録

Although the Daurian Redstart Phoenicurus auroreus is currently classified as a winter visitor in Japan, we collected 13 nests of this species in Mt. Yatsugatake, central Japan. They were all bowl-shaped with a base extending to one side. The confirmed breeding nests had an outer diameter of an average of 129mm, an inside diameter of an average of 73mm and a depth of an average of 31mm. They were composed primarily of fine roots, bryophyta and grass stems with animal hair, feathers and grass leaves built into them. Many of the nests had a nest cup lined with animal hair on fine roots. The basal part of many nests was also built mainly of bryophyta, fine roots, grass stems, twigs and tree leaves.