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Distribution of five mtDNA control-region haplotypes through time for Blakiston’s fish owl on Hokkaido Island: (a) before 1964, (b) in intervals 1965–1980, (c) 1981–1996 and (d) 1997–2012. Color codes at the lower left indicate the haplotypes shared by individual owls. Each symbol indicates a sampling location. Circles show sampling groups analyzed as local populations. The map at the upper left shows the location of Hokkaido Island in eastern Asia.
