Study for the Biotope Conservation and Network with the Frogs-habitat in Rural Area

近年来，生物多样性的重要性已被广泛接受。在这种背景下，生态信息对于城乡区域景观规划都是不可或缺的。本文提出了一种以两栖动物为材料估算农村地区物种分布的方法。基于两栖动物物种组成与土地属性的关系，构建了潜在生境估算模型。对水户市及周边地区24个地点的两栖动物进行了调查。它被分为丘陵地区和高原/低地地区。丘陵地区的特点是；东京海参、花海参和野海参。为了解神奈川县丘陵地区两种褐蛙的种群密度，于2001年对其生境分布进行了调查，并进行了卵量统计。多摩山和三浦山分布着许多日本金盏花的栖息地。在城市丘陵区，花楸属植物是对生境环境恶化较为敏感的物种。我们认为两只棕蛙的卵质量计数是可能从各个部门积累的有用信息。讨论了石泽冲积扇水田边沟渠结构的对应性和池蛙的栖息地。本文还采用1:25000比例尺的带状样带调查，探讨了蛙类的栖息与伊泽地区景观结构的关系。对石泽冲积扇水田沟的分布进行了调查和考虑，研究了城市周边地区野田蛙（Rana japonica）在非繁殖期对野田蛙（Rana japonica）的生境利用特征。分别在沼泽、森林边缘和森林内部这三种构成草甸的主要环境中设置方框进行调查，并以此作为询问人口密度的方法。因此，不同植被的平均种群密度不同。因此，植被管理对滩地褐蛙的保护是必要的。少

The significance of biodiversity has been widely accepted in recent years. In this context ecological information are indispensable for regional landscape planning in both urban and rural areas. We propose a procedure to estimate species distribution in a rural area using amphibians as materials. Estimation model of potential habitats was constructed based on the relationship between amphibian species composition and land attributes. The investigation of amphibians in 24 sites was performed in and around Mito city. it was divided into hilly areas and plateau/lowland areas. Hilly areas are characterized by ; Hynobius tokyoensis, Rana ornativentris and Rana rugosa. To understand population density of two brown frogs in hilly area in Kanagawa prefecture, we investigated the distribution of frog's habitats and counted egg masses in 2001. Many habitats of R.japonica dotted in Tama Hills and Miura hills. Habitat's of R.ornativentris were sensitive species to the deterioration of habitat's co … More ndition than R.ornativentris in urban hilly area. We consider the counting of egg masses of two brown frogs the useful information that is possible to accumulate from various sectors.We discussed about habitation of the pond frog Rana porosa porosa, and correspondence of the structure of a ditch in the side of a paddy field in the Isawa alluvial fan. The belt-transect survey at a scale of 1:25000 was investigated in order to clarify the relation between the inhabitation of frogs and the landscape structure in the Isawa too. The breeding site of brown frogs Rana japonica and R.ornativentris, was restricted to the edge of the alluvial fanThe distribution of a ditch around a paddy field in the Isawa alluvial fan was investigated and considered We study the characteristics of habitat use by Japanese forg, Rana japonica at non-breeding season in Yato-space in the city-surroundingarea. Investigation installing quadrate, respectively in the fen, forest edge, and forest interior, which are the main environment constituting yato-stace, and was taken as the method of asking for the population density. As a result, the mean population density was different according to vegetation. Therefore, vegetation management is necessary for conservation of Japanese brown frog in the fen. Less