個体数推定に基づく生息域外保全に向けたファウンダー確保の取組：国内希少野生動植物種指定のスジシマドジョウ類を例として

抄録

When selecting founders of endangered species for ex situ conservation, it is necessary to acquire sufficient individuals so as to ensure the genetic diversity of the ex situ population, while taking into consideration the impact of removing founders from the in situ population. Surveys for population estimation by removal method were conducted for two Cobitis species in November 2019. For each estimation, a population was surveyed 5–8 times using dip nets to remove captured individuals, the hierarchical Bayesian model being used to estimate the number of individuals in the population. The Cobitis takenoi population was estimated 500–5,305 (95% CI) individuals, and the Cobitis striata hakataensis population, 249–1,601 (95% CI) individuals. The number of individuals selected to be founders was based on the lower limit of the 95% credible interval of the estimate, thereby minimizing the impact on the in situ population. This established protocol was considered to be a model case for securing future ex situ conservation populations.