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首页> 外文期刊>Paddy and Water Environment >Population model of Rana japonica crossing agricultural concrete canals: evaluating population conservation by improving the migration routes of frogs
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Population model of Rana japonica crossing agricultural concrete canals: evaluating population conservation by improving the migration routes of frogs

机译：林蛙跨越农业混凝土渠的种群模型：通过改善青蛙的迁徙路线评估种群保护

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Agricultural canals with deep concrete walls are commonly installed in paddy field areas following land consolidation projects in Japan. Such canals create a critical migration barrier for frogs, as escape is not possible after falling in. Hence, countermeasures that allow migrating frogs to cross agricultural canals, such as lid structures to prevent frogs from falling in or the creation of partial slopes to allow escape, have been developed to conserve endangered frog populations. The objective of this study was to design a method for evaluating the population viability of the endangered Japanese Brown Frog, Rana japonica, following the implementation of countermeasures. Two types of model simulations were examined: (1) a “basic model,” based on an age-structured model and (2) a “crossing model,” to evaluate migrating frogs crossing canals. Parameters, such as survival rate and fecundity, were estimated from field observation data of age-dependent population fluctuations. Comparison of a basic model simulation with the field observation data suggests model validation. The crossing model simulation, which had an initial population of 1,000 individuals, showed that a crossing proportion of greater than 30–40% would achieve 95% population viability after 5 years. The simulation also showed that a crossing proportion of over 80% would also achieve 95% population viability after 40 years. These results indicate that frog survival during the migration period is insured, as long as no additional countermeasures are necessary after installation.
机译：在日本的土地整理项目之后，通常在稻田地区安装具有深混凝土墙的农渠。这样的运河为青蛙创造了关键的迁移障碍，因为它们掉入后无法逃脱。因此，采取了一些措施，允许迁移的青蛙越过农业运河，例如防止青蛙掉入的盖结构或为了允许逃生而形成的部分斜坡。 ，已开发，以保护濒临灭绝的青蛙种群。这项研究的目的是设计一种方法，以在采取对策后评估濒临灭绝的日本褐蛙（Rana japonica）的种群生存力。检验了两种类型的模型模拟：（1）基于年龄结构模型的“基本模型”和（2）“渡越模型”，以评估青蛙越过运河的迁移情况。诸如存活率和繁殖力之类的参数是根据年龄相关的人口波动的实地观察数据估算的。基本模型仿真与现场观察数据的比较表明模型验证。最初有1,000个种群的杂交模型模拟表明，杂交比例大于30-40％，则5年后种群存活率将达到95％。模拟还表明，超过40％的交叉比例也将在40年后实现95％的种群生存力。这些结果表明，只要安装后无需采取其他对策，就可以确保青蛙在迁徙期间的生存。

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