Trial to detect genomic footprints of local and domestic adaptation in Ayu populations

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To set conservation units and to detect genomic footprints of local and domestic adaptation in Ayu populations, wild and hatchery populations collected from Japan, China, and Korean Peninsula were investigated by a multitude DNA markers. Inferred from mitochondrial DNA sequence data, estimating divergence times between subspecies was 1 million years ago and those among local populations were 70000-150000 years ago. Based on this results and other DNA data, we proposed significant units to conserve genetic diversity of Ayu populations. The relationships between genetic diversities and number of successive generation in the hatchery populations showed apparently negative correlation. This results would be attributed to genetic drift and/or adaptation of the captive stocks to the culture condition. Unfortunately, genome scan could not detect outlier locus indicating adaptation in wild and hatchery populations.