Stockley P, Searle J B, MacDonald D W, Jones C S
Department of Zoology, University of Oxford, U.K.
Proc Biol Sci. 1993 Dec 22;254(1341):173-9. doi: 10.1098/rspb.1993.0143.
Three hypotheses concerning potential genetic benefits of female multiple mating behaviour are evaluated for the common shrew. In a high-density population, many successful copulations took place between individuals estimated to be close relatives (e.g. full or half siblings). Juveniles resulting from such matings tended to be relatively small at weaning, and were generally less likely to survive to sexual maturity than more outbred individuals. Multiple paternity was discovered in eight of nine litters examined. The incidence of matings between close relatives, the cost of inbreeding, and the high incidence of multiple paternity presented are each consistent with the hypothesis that female multiple mating is a strategy to reduce inbreeding. That is, if females cannot always distinguish close kin, then they may copulate with several different males and so reduce the risk that all their offspring will be sired by a close relative.
针对普通鼩鼱，评估了关于雌性多次交配行为潜在遗传益处的三种假说。在高密度种群中，许多成功的交配发生在据估计为近亲的个体之间（例如全同胞或半同胞）。这种交配产生的幼崽在断奶时往往相对较小，并且与远交个体相比，通常活到性成熟的可能性更小。在所检查的九窝幼崽中，有八窝发现了多重父权现象。近亲之间交配的发生率、近亲繁殖的代价以及所呈现的高多重父权发生率，均与雌性多次交配是一种减少近亲繁殖的策略这一假说相一致。也就是说，如果雌性不能总是区分近亲，那么它们可能会与几个不同的雄性交配，从而降低其所有后代都由近亲所生的风险。
