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The wintering ecology of the Japanese Marsh Warbler Megalurus pryeri is poorly known, as this species is cryptic and inhabits marsh inaccessible even in winter. Recently, the whereabouts of wintering grounds have been accumulated through a Japan Environment Agency ringing project, though scant wintering records were known before 1970 (Momiyama 1949, Nagata 1997). The warbler winters in reedbeds from Ibaraki to Kagawa Prefecture along the Pacific sea side of central Japan, and there are some passage records in northern part of central Japan, Niigata and Miyagi Prefectures (Nagata 1997). Some authors reported that this warbler wintered and inhabited in dead reeds boggy marsh, where soil was too soft and spongy to allow safe passage (Momiyama 1949, Moyer 1953). Moyer (1953) reported that a few warblers were observed and captured in 1953 on the north-eastern shore of Lake Kasumigaura. Although the fine marsh along this shore has since disappeared, some warblers were ringed in winter near Tsuchiura and Ukishima along the shore of the lake (Y. Masuda pers. comm., Bird Migration Research Center 1994). Moreover, a new breeding population has established in Ukishima since 1992 (Kanai & Ueta 1994). To clarify the overwintering ecology of M. pryeri, we conducted monthly mist-netting at two study sites along the southern shore of Lake Kasumigaura in winter, 1995/1996. In this article we report monthly population changes and briefly analyze mark-andrecapture data of the warbler. We think accumulating information of this species' wintering ecology is important for its conservation, despite the small sample sizes included.

Some Notes on the Wintering Ecology of Japanese Marsh Warblers, Megalurus pryeri, at Two Sites around Lake Kasumigaura.