研究ノート
北海道コムケ湖におけるシマアオジ生息状況の変遷
2023 年 55 巻 2 号 p. 131-136
詳細
2023 年 55 巻 2 号 p. 131-136
The population trend of the Yellow-breasted Bunting (YbB) Emberiza aureola was clarified based on surveys of presence-absence status of YbB in 10 sites of the Lake Komuke area, north-eastern Hokkaido, from May to July of 1990 – 2012. Numbers of sites in which YbBs occurred began to decrease from the end of 1990’s and decreased abruptly in 2000’s. It is considered that population decrease in this area was more delayed than in other areas of Hokkaido.
