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発表 CONSERVATION OF AQUATIC INSECT COMMUNITIES USING THE FALLOW FIELD BIOTOPE.

作成年度 2018 年度
論文名 CONSERVATION OF AQUATIC INSECT COMMUNITIES USING THE FALLOW FIELD BIOTOPE.
論文名(和訳) 休耕田ビオトープの造成による水生昆虫群集の保全
論文副題
発表会 12th International Symposium on Ecohydraulics
誌名 12th International Symposium on Ecohydraulics 和訳:第12回国際水環境学会
巻・号・回
発表年月日 2018/08/19 ~ 2018/08/24
所属研究室/機関名 著者名(英名)
河川生態チームTAWA KOTA
兵庫県立大学大学院地域資源マネジメント研究科 SAGAWA SHIRO
抄録
The Toyooka Basin located in Hyogo, Japan, is a major base for the reintroduction of the Oriental white stork Ciconia boyciana. Fallow field biotopes, which are artificial wetlands in paddy areas, have been created as habitats for lentic aquatic animal communities and as feeding sites for storks in the Toyooka Basin. We studied the effect of the fallow field biotope on the habitat of Odonata, Hemiptera, and Coleoptera taxa, which are the predator and indicator fauna in paddy fields, and compared it with that of paddy fields. Abundances of some adult diving beetles, such as Graphoderus adamsii, Hydaticus grammicus, Rhantus suturalis, and Cybister brevis, increased drastically in August in the fallow field biotope. However, their larvae were mainly captured in paddy fields around the fallow field biotope during the reproductive season, whereas they were rarely seen in the biotope. Surface water is lost in paddy fields after August for rice harvest; therefore, we speculated that adult beetles must have migrated in the biotope. Although some larval Odonata taxa (e.g., Orthetrum, Anax, and Zygoptera) appeared at both the paddy fields and the biotope, Sympetrum larvae, the indicator taxa of paddy fields, were only observed in the paddy fields. The population numbers of the water stick insect, Ranatra chinensis (Hemiptera) dramatically increased in the deep-water area of the biotope in October. These results suggested that the fallow field biotope had different aquatic insect communities than those in the paddy fields and the fallow field biotope acts as a refugium habitat for aquatic insects during the paddy field drainage season. Therefore, it is presumed that fallow field biotopes would greatly improve the diversity of aquatic insects in paddy field areas.
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