Breeding Habitats of Frogs in Paddy Field and Fallow Field Biotopes in Shounji (toyooka City, Hyogo Prefecture)

27 Mar Breeding Habitats of Frogs in Paddy Field and Fallow Field Biotopes in Shounji (toyooka City, Hyogo Prefecture)

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Abstract

2016年の４月から９月に兵庫県豊岡市祥雲寺の水田域とビオトープ域においてカエル類オスの繁殖期に発する鳴き声を記録した．その結果，ニホンアマガエル，ツチガエル，トノサマガエル，ヌマガエル，シュレーゲルアオガエル，モリアオガエル，そしてウシガエルの計７種が記録された．ニホンアマガエルとヌマガエルは主に水田域で記録されたことから，水田を繁殖場所に選ぶと考えられた．一方で，ツチガエルやモリアオガエルは主にビオトープ域で記録され，その理由として，ビオトープの緩流や森林との距離などが推察された．トノサマガエルとシュレーゲルアオガエルは両水域で多く記録されたが，鳴き声のピーク期が水域ごとに異なった．以上より，祥雲寺地区のカエル類の繁殖場所や繁殖時期が種ごとに異なるため，地区内での水田の早期湛水や中干し延期，マルチトープおよび谷津田ビオトープの造成がこれらのカエル類の繁殖に正の効果をもたらすことが示唆された．

English Abstract

We investigated the breeding habitats of frogs in paddy field (temporary waters) and fallow field biotopes (permanent water area) in Shounji of Toyooka City, Hyogo Prefecture. Frog calls were recorded at night from April to September in 2016. The calls of seven frog species (Hyla japonica, Glandira rugosa, Pelophylax nigromaculatus, Rhacophorus schlegelii, Rhacophorus arboreus, Fejervarya kawamurai and Lithobates catesbeianus) were recorded at the study sites. While H. japonica and F. kawamurai called mainly from paddy fields, most calls of G. rugosa were from various other biotopes, and R. arboreus called only from paddy fields. P. nigromaculatus and R. schlegelii called from both biotopes, with their calls having different peak periods in each area. A lysis from all sites indicated that only a few calls of L. catesbeianus were recorded. Our results suggest that the construction of suitable biotopes near paddy fields will contribute to the preservation of spawning sites for many tive frog species in Shounji.