Abstract
Dams are effective to prevent flood disasters and effectively use water resources. However, the impact on the ecosystem is concerned, such as the dam blocking the movement of organisms upstream and downstream. Moreover, it is not possible to prevent a disaster once every several 100 years. Originally, it was designed with a balance between disaster risk and ecological risk, and these risks are not completely eliminated. Which risk is to be emphasized changes from decade to decade, and it should be different, for example, between nature reserves and the rivers flowing through large cities. In this chapter, using a generalized linear model, we propose a regression equation that predicts the survival probability of the char population upstream of the dam from the years after the installation of the dam and the catchment area. Using this model, we extrapolated the future extinction risk of local populations. In addition, population viability analysis is performed using life table analysis to predict extinction risk. At that time, we considered the annual fluctuation of the subscription rate. In this way, both statistical analysis based on distribution information and population modelling based on life history parameters suggest that the risk of extinciton increases due to the division of habitat by dams.
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Acknowledgments
I thank Dr. Junko Nakanishi and Shigeki Masunaga for collaboration of the previous article.
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Matsuda, H., Morita, K. (2021). Effects of Dams on Ecological Risk of Inland Fishes. In: Matsuda, H. (eds) Ecological Risk Management. Ecological Research Monographs. Springer, Singapore. https://doi.org/10.1007/978-981-33-6934-4_15
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DOI: https://doi.org/10.1007/978-981-33-6934-4_15
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