89 0 0 0 OA 霞ヶ浦の流入河川「桜川」における魚類相とその長期的変遷
- 著者
- 渡邊 美如々 木村 将士 碓井 星二 根本 隆夫 外山 太一郎 宮崎 淳一 加納 光樹
- 出版者
- アクオス研究所
- 雑誌
- 水生動物 (ISSN:24348643)
- 巻号頁・発行日
- vol.2022, pp.AA2022-16, 2022-08-23 (Released:2022-08-23)
The fish fauna in the middle and lower reaches of Sakura River flowing into Lake Kasumigaura was investigated with casting nets, hand nets and scoop nets in May, July, and October 2020 and from April to October 2021, and compared with data from previous studies conducted in 1984–1987, 1996–2002 and 2010–2015. A total of 36 fish species in 11 families, including 20 introduced exotic and Japanese species and 16 native species, were collected in 2020–2021. The analyses of long-term changes in presence/absence of fish species from the 1980s to the 2020s demonstrated the disappearance of four threatened species (three native bitterling species and the crucian carp Carassius buergeri subsp. 2) by various artificial environmental changes and a gradual increase in introduced exotic and Japanese species spreading mainly from Lake Kasumigaura.
言及状況
外部データベース (DOI)
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学生の論文が出ました！霞ヶ浦に流入する「桜川」で過去30年間の魚類相変遷を解明。絶滅危惧種4種の消失、ダントウボウやコクチバスなど外来種の相次ぐ侵入を確認。最近はハクレンも繁殖（利根川以外で唯一）。モニタリングの継続＋対策の検討が必要です。
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