Record of a singing Yellow-browed Warbler Phylloscopus inornatus during the breeding season in highlands of Mt. Norikura, central Japan

Abstract

Songs of a Yellow-browed Warbler Phylloscopus inornatus were recorded during the breeding season at the tree line boundary in Mount Norikura, central Japan. Yellow-browed Warblers have been known as migrants or rare winter residents in Japan, and this is the second record during the breeding season. They breed in habitats dominated by Japanese Larch Lalix leptolepis, birch Betula sp., and Japanese Stone Pine Pinus pumila. The tree line in Japanese mountains is dominated by Erman's Birch B. ermani, with adjacent Japanese Stone Pine scrubs. Thus, the highland areas of the Japanese mountains are assumed to be suitable potential habitat for Yellow-browed Warblers during the breeding season.