Role of male-biased dispersal in inbreeding avoidance in the grey-sided vole (Myodes rufocanus)

Molecular Ecology
Yasuyuki Ishibashi, Takashi Saitoh

Abstract

Effects of male-biased dispersal on inbreeding avoidance were investigated in a semi-natural population of Myodes (formerly Clethrionomys) rufocanus using a large outdoor enclosure (3 ha). Parentage of 918 voles weaned from 215 litters and relatedness of mates were analysed using microsatellite loci, and dispersal distances were obtained from mark-recapture live-trapping data. Natal and breeding male-biased dispersal was observed. There remained, however, chances that incestuous mating could occur, because not all males dispersed from their natal site, and 51 matings occurred between relatives (relatedness r > 0). The number of weaned juveniles from inbred litters was significantly smaller than that from non-inbred litters. Fourteen incestuous matings occurred between close relatives (r >or= 0.25), most of which were those between non-littermate maternal half siblings (four cases) and those between paternal half siblings (seven cases). When comparing the observed frequencies to the expected ones generated by combining every oestrous female with a male randomly chosen from her surroundings, the observed values for inbreeding of r >or= 0.25 were significantly smaller than the expectations, while no difference was observed for inb...Continue Reading

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Citations

Jun 19, 2013·The Journal of Heredity·Yasuyuki IshibashiTakashi Saitoh
Jan 4, 2012·Molecular Ecology·Jean-François Le GalliardXavier Lambin

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