日本初記録コノドジロムシクイについて

抄録

On 11 October 1994, one Lesser Whitethroat Sylvia curruca was captured during banding research at Nishikikyo, Hakodate-shi, Hokkaido. Measurements were wing 60.5mm, tail 54.5mm, tarsus 19.7mm, exposed culmen 8.9mm, total length 119.0mm and wing span 163.0mm. The bird showed a grey crown, with distinctly contrasting dark lores and ear-covers, white throat, white on outermost tail feathers and dark slate-colored legs. These characteristics are consistent with descriptions for this species by Svensson (1992) and Baker (1997). In addition, a skull ossification index of E, combined with frayed edges on the tail feathers, grayish-brown iris and distinct white markings on outermost tail feathers, suggested that the bird was an aduit. Sex and subspecies could not be positively identified, but given the geographical location and relative length of primary feather, S. c. blythi was considered likely. The Lesser Whitethroat breeds widely across the Eurasian continent, and winters from Africa to southern Asia. This was the first record for this species in Japan.