Extra-pair paternity in alpine marmots Marmota marmota : genetic quality and genetic diversity effects

摘要: Assuming that a male’s genetic characteristics affect those of his offspring, extra-pair copulation has been hypothesized to increase heterozygosity the progeny—the “genetic compatibility” hypothesis—and diversity within litters—the diversity” hypothesis. We tested these two hypotheses in alpine marmot (Marmota marmota), socially monogamous mammal showing high rate paternity (EPP). In first step, we assumption (heterozygosity and similarity female) offspring. Genetic between parents influenced offspring heterozygosity, their mother, litter diversity. The father’s also but did not heterozygosity. Hence, seems be heritable marmot. second compared young (EPY) within-pair (WPY). EPY were less genetically similar mother more heterozygous than WPY. siblings WPY half siblings. Finally, presence promoted litter. Thus, our data support both hypotheses. discuss further investigations needed determine primary causes EPP this species.