Jehle Robert, Sztatecsny Marc, Wolf Jochen B W, Whitlock April, Hödl Walter, Burke Terry
Department of Evolutionary Biology, University of Bielefeld, Morgenbreede 45, Bielefeld 33615, Germany.
Biol Lett. 2007 Oct 22;3(5):526-8. doi: 10.1098/rsbl.2007.0311.
Under sperm competition, paternity is apportioned by polyandrous females according to the order of matings and the genetic quality of the inseminating males. In order to distinguish between these two effects, we sequentially paired 12 female smooth newts (Lissotriton vulgaris) with each of two males and, where possible, repeated the same procedure in reverse order of the identical males after assumed sperm depletion. For a total of 578 offspring, amplified fragment length polymorphisms genetic markers revealed multiple paternities in all matings, without significant first- or second-male sperm precedence. The paternity share of individual males was transitive across the two trials with male order switch, and successful males had a significantly higher genetic dissimilarity to the female than expected by chance. We argue that patterns of paternity in natural newt populations are determined through a combination of good genes and relatedness.
在精子竞争中，多配偶制的雌性会根据交配顺序和授精雄性的基因质量来分配父权。为了区分这两种影响，我们将12只雌性光滑蝾螈（Lissotriton vulgaris）依次与两只雄性中的每一只配对，并在可能的情况下，在假定精子耗尽后，以相同雄性的相反顺序重复相同的程序。对于总共578个后代，扩增片段长度多态性遗传标记显示所有交配中都存在多个父权，没有明显的首次或第二次雄性精子优先现象。在雄性顺序切换的两次试验中，单个雄性的父权份额是可传递的，成功的雄性与雌性的基因差异显著高于随机预期。我们认为，自然蝾螈种群中的父权模式是通过优良基因和亲缘关系的结合来确定的。
