Paddy fields are essential habitats for frogs. We evaluated the impacts of both farmland consolidation including agricultural road improvement and farmland abandonment on the two Rana species using a model incorporating spatial autocorrelation. A sampling unit consists of several paddy fields that share a ditch and are isolated from other blocks by roads or other land covers. We surveyed 619 blocks in an area of about 1000 km² from the plain to the mountains of Toyota City in central Japan. Among them, 124 blocks included at least a flooded paddy field where frogs could lay eggs. R. ornativentris and R. japonica bred in 50 and 25 blocks, respectively. We constructed models to explain the presence/absence of two species by GLM (non-spatial model) and hierarchical Bayesian model with INLA (spatial model) that includes spatial autocorrelation as a random effect. Explanatory variables of the local scale were the altitude, location of the paddy field (yatsuda (valley bottom paddy fields) or non-yatsuda), farmland consolidated or not consolidated, and under cultivation or abandoned. Those of the landscape scale were areas of forest and paddy fields, and road density in 14 circles with different radius from 50 to 2000 m. Both species’ distribution had significant spatial autocorrelation. The spatial model had a higher discriminative ability than the non-spatial model. Farmland consolidation and the forest area in the 400 m radius had a positive effect on R. ornativentris. Altitude and road density in the 50 m radius had negative effects, cultivation had a positive effect, and farmland consolidation and yatsuda had no or negative effects on R. japonica. R. ornativentris was threatened by farmland abandonment, but the urbanization and/or farmland consolidation threatened R. japonica.

稻田是青蛙的重要栖息地。我们使用包含空间自相关的模型评估了包括农业道路改善和农田废弃在内的农田整合对两种林蛙物种的影响。一个采样单元由几个稻田组成，这些稻田共用一条沟渠，并通过道路或其他土地覆盖物与其他街区隔离。我们调查了日本中部丰田市从平原到山区约 1000 km ^{2范围内的 619 个街区。}其中，124个街区至少包括一片被淹的稻田，青蛙可以产卵。R. ornativentris和R. japonica分别在 50 块和 25 块中繁殖。我们构建了模型来通过 GLM（非空间模型）和包含空间自相关作为随机效应的 INLA（空间模型）的分层贝叶斯模型来解释两个物种的存在/不存在。局部尺度的解释变量为海拔高度、水田位置（八田（谷底水田）或非八田）、耕地合并与否、耕地或弃耕。景观尺度为林地、水田面积，道路密度为50～2000m不同半径的14个圆圈。两种物种的分布具有显着的空间自相关性。空间模型比非空间模型具有更高的判别能力。400 m 半径范围内农田整治和林地面积对R. ornativentris。50m半径范围内海拔和道路密度有负效应，耕作有正效应，耕地整治和八田对粳稻没有或负效应。R. ornativentris受到农田遗弃的威胁，但城市化和/或农田整合威胁到R. japonica。