Abstract
Genotyping of endangered species is helpful for establishing and evaluating conservation strategies. Mitochondrial sequence data was analyzed from 541 individuals of a critically endangered fish, Acheilognathus typus from present-day range-wide localities to re-evaluate an in-progress restoration program around Lake Izunuma-Uchinuma, Miyagi, Japan. Acheilognathus typus showed low sequence diversity with only eight haplotypes and π and ĥ values of 0.59129 and 0.00118 respectively. Genetic data suggests Acheilognathus typus is adapted to pulsed environments and prone to population flush and crash. Genotyping of populations in introduced localities revealed that their source is not from nearby localities.
Highlights
IntroductionGenotyping of endangered species offers opportunities for establishing conservation strategies, for evaluating conservation unit (Crandall et al 2000)
Genotyping of endangered species offers opportunities for establishing conservation strategies, for evaluating conservation unit (Crandall et al 2000). This is especially important for freshwater fish geographically isolated by marine and land barriers
The low sequence diversity represented by both π and ĥ values with a simple haplotype network even in the fast evolving control region (Fig. 2), and negative Tajima’s D value as a whole (Table 3), indicate the population experienced a bottleneck followed by expansion in the recent past
Summary
Genotyping of endangered species offers opportunities for establishing conservation strategies, for evaluating conservation unit (Crandall et al 2000) This is especially important for freshwater fish geographically isolated by marine and land barriers. Acheilognathus typus Bleeker, 1863 is a medium-sized bitterling endemic to eastern Honshu Island, Japan It was a common freshwater fish in shallow lakes, ponds, lowland rivers, and streams several decades ago, but desperately declined after the World War II (Nakamura 1963). Populations in a few ponds in the lake catchment were found after intensive survey (#6-2, 6-3, 6-4) We conducted this genetic research after the finding of these populations, and identified the introduced populations near the lake (#6-5, 6-6) were not representatives of the past Lake Izunuma-Uchinuma population
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