Staying periods near natal area of post-fledging juveniles in some forest migrant breeders

Abstract

The staying periods of Asian Stubtail Urosphena squameiceps, Black-faced Bunting Emberiza spodocephala, and Eastern Crowned Leaf Warbler Phylloscopus coronatus post-fledging juveniles in their natal area were estimated by banding their nestlings and recapturing the birds during autumn bird banding periods in the deciduous forest of Hokkaido Research Center, Forestry and Forest Products Research Institute, Sapporo, Hokkaido. We had 11 recaptures of juvenile Asian Stubtails. The mean elapsed period after fledging was 56 days and the longest was 76 days. This implies that this species may stay close to their natal site for approximately 2 months after fledging. Three juvenile Black-faced Buntings that fledged from same nest were recaptured. The longest stay observed was 90 days after fledging. Recapture data between study site and neighbor banding sites during the autumn migration season showed not only southerly, but also northerly and easterly directions from the release point in short periods from the release. Only one Eastern Crowned Leaf Warbler juvenile was recaptured at a location that was west-southwest from the release point and was at 32 days after fledging.