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Plos One : Inbreeding Avoidance Drives Consistent Variation of Fine-scale Genetic Structure Caused by Dispersal in the Seasonal Mating System of Brandt’s Voles, Volume 8

By Bilde, Trine

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Book Id: WPLBN0003950404
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos One : Inbreeding Avoidance Drives Consistent Variation of Fine-scale Genetic Structure Caused by Dispersal in the Seasonal Mating System of Brandt’s Voles, Volume 8  
Author: Bilde, Trine
Volume: Volume 8
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary)
Historic
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Publisher: Plos

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Bilde, T. (n.d.). Plos One : Inbreeding Avoidance Drives Consistent Variation of Fine-scale Genetic Structure Caused by Dispersal in the Seasonal Mating System of Brandt’s Voles, Volume 8. Retrieved from http://netlibrary.net/


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Description : Inbreeding depression is a major evolutionary and ecological force influencing population dynamics and the evolution of inbreeding-avoidance traits such as mating systems and dispersal. Mating systems and dispersal are fundamental determinants of population genetic structure. Resolving the relationships among genetic structure, seasonal breedingrelated mating systems and dispersal will facilitate our understanding of the evolution of inbreeding avoidance. The goals of this study were as follows : (i) to determine whether females actively avoided mating with relatives in a group-living rodent species, Brandt’s voles (Lasiopodomys brandtii), by combined analysis of their mating system, dispersal and genetic structure: and (ii) to analyze the relationships among the variation in fine-genetic structure, inbreeding avoidance, seasondependent mating strategies and individual dispersal. Using both individual- and population-level analyses, we found that the majority of Brandt’s vole groups consisted of close relatives. However, both group-specific FISs, an inbreeding coefficient that expresses the expected percentage rate of homozygosity arising from a given breeding system, and relatedness of mates showed no sign of inbreeding. Using group pedigrees and paternity analysis, we show that the mating system of Brandt’s voles consists of a type of polygyny for males and extra-group polyandry for females, which may decrease inbreeding by increasing the frequency of mating among distantly-related individuals. The consistent variation in within-group relatedness, among-group relatedness and fine-scale genetic structures was mostly due to dispersal, which primarily occurred during the breeding season. Biologically relevant variation in the fine-scale genetic structure suggests that dispersal during the mating season may be a strategy to avoid inbreeding and drive the polygynous and extra-group polyandrous mating system of this species.

 

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