Wintering records of Ross's Gull <i>Rhodostethia rosea</i> in Kanto, Japan
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- KUWABARA Kazuyuki
- Natural History Museum and Institute, Chiba
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- SHIBATA Saori
- Yatsu Higata Nature Center
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- ONO Tomomi
- Yatsu Higata Nature Center
Bibliographic Information
- Other Title
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- 関東地方のヒメクビワカモメ<i>Rhodostethia rosea</i>の越冬記録
- 関東地方のヒメクビワカモメRhodostethia roseaの越冬記録
- カントウ チホウ ノ ヒメクビワカモメ Rhodostethia rosea ノ エットウ キロク
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Description
Ross's Gull Rhodostethia rosea is a small species with restricted, distribution in arctic areas. Breeding ground are on arctic tundra, and the total number of breeding pairs is estimated at between 10,000 and 25,000. Even during the winter months, this species sticks to northern latitudes, and has been thought to move only as far south as the edge of the drift ice allong the north Pacific coast. The seasonal movements, however, are still poorly understood, and in 1999-2001 several confirmed observations were reported in the Kanto Region of central Honshu. One 1st winter plumage gull (Fig. 1) was observed at the Yatsu Tidelands, Chiba Prefecture, along the northernmost coast of Tokyo Bay, from Nov 23th 1999 to Mar 18th 2000. This individual was observed foraging and scavenging on the tidal flat, and also feeding on marine worms in a flock of Black-headed Gull Larus ridibundus. A single 1st winter plumage bird was also observed on Dec 4th 1999 at nearby Funabashi Seaside Park, and another on Mar 5th at the mouth of the Obitsu River, along the eastern shore of the bay. In addition, a single juvenile was observed on Dec 28th 1999 at Kujukuri hama, a long sandy beach located on the eastern (Pacific Ocean) side of Chiba Prefecture, and another juvenile (molting into 1th winter plumage Fig. 2, Fig. 3) from Jan 9th through 16th 2000 around the mouth of the Tone River in Chiba and Ibaraki Prefecture.
Journal
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- The Bulletin of the Japanese Bird Banding Association
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The Bulletin of the Japanese Bird Banding Association 17 (1), 9-15, 2003
The Japanese Bird Banding Association
