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Zoological science

Multiple Origins and Admixture of Recently Expanding Japanese Wild Boar (Sus scrofa leucomystax) Populations in Toyama Prefecture of Japan.


PMID 26853867

Abstract

Japanese wild boar (Sus scrofa leucomystax) populations have expanded drastically throughout the Japanese Archipelago in recent decades. To elucidate the dispersal patterns of Japanese wild boar in Toyama Prefecture in central Japan, we used a multi-locus microsatellite DNA analysis to determine its population structure and the degree of admixture. The deviation from Hardy-Weinberg equilibrium was detected in either total or separate regional wild boar samples from Toyama Prefecture. This result could be explained by the Wahlund effect resulting from the mixture of samples from different sources. Bayesian structure analysis, assignment test, and factorial correspondence analysis suggested that wild boars around Toyama Prefecture derive from at least two ancestral sources. The migration and possible mating of each individual may have occurred recently and continued in each geographically neighboring region. The present genetic results may be useful for prediction of future dispersal patterns of Japanese wild boar, as well as other animals in expansion.

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