Paddy fields play an important role as alternative habitats for various wetland-dependent species. Agricultural intensification in paddy fields, however, presents serious threats to these species. Here, we examined the environmental factors, including those related to modern farming practices, affecting the distribution of the Sado wrinkled frog (Glandirana susurra) in paddy fields on Sado Island, Japan. We recorded the abundance of frogs at 42 sites in early and late June 2014 and investigated the species’ responses to several local and landscape-scale variables. We found that frog abundances decreased sharply following the drainage of paddy fields in mid-June and were negatively associated with deep concrete irrigation ditches that surrounded the paddies. The addition of conservation ditches built into rice paddy fields, however, was shown to mitigate against the effects of the drainage. Our results suggest that conservation ditches serve as refuges for G. susurra. We propose that decreasing the depth of irrigation ditches or providing structures for frogs to use and traverse the ditches could be useful approaches that help conserve G. susurra. We also suggest the increased use of conservation ditches and implementation of aquatic biotopes in the surrounding landscape might serve to aid this species’ long-term conservation.

稻田作为各种依赖湿地的物种的替代生境发挥着重要作用。然而，稻田中的农业集约化对这些物种构成了严重威胁。在这里，我们研究了环境因素，包括与现代耕作方式有关的环境因素，这些环境因素影响了佐渡皱纹青蛙（Glandirana susurra）在日本佐渡岛的稻田中。我们在2014年6月上旬和下旬记录了42个地点的青蛙数量，并调查了该物种对几个局部和景观尺度变量的响应。我们发现，6月中旬稻田排水后，青蛙的丰度急剧下降，并且与包围稻田的深层混凝土灌溉沟渠负相关。然而，已证明在稻田中增加了保护性沟渠可以减轻排水的影响。我们的研究结果表明，保护性沟渠可作为苏氏沼虾的避难所。我们建议减少灌溉沟渠的深度或为青蛙提供使用和穿越沟渠的结构可能是有助于保护G. susurra的有用方法。。我们还建议增加使用保护性沟渠和在周围景观中实施水生生物群落可能有助于该物种的长期保护。