富山県および大阪府に生息するイタセンパラ集団の遺伝的構造

抄録

In order to establish a feasible conservation program for the Itasenpara bittering (Acheilognathus longipinnis), the genetic population structure was determined on the basis of five microsatellite loci for wild and captive populations from Himi City, Toyama Prefecture, and the Yodo River system, Osaka Prefecture. An endemic genetic feature was found in each of the Toyama and Osaka regional populations, indicating that each should be treated as a separate unit in any future conservation program. The degree of genetic diversity in the Toyama populations tended to be lower than that in the Osaka population, being related to the population size and/or population demography. In the Toyama region, captive populations showed an equal degree of genetic diversity as the wild populations, probably due to a relatively short period of captive breeding as well as continuing introductions of wild individuals.