Host species of a sexual-parasite do not differentiate between clones of Amazon mollies

A major mechanism of pre-zygotic isolation is the ability for individuals to recognize conspecifics. In gynogenetic species complexes, the sexual host species occur in syntopy with the unisexual species that relies on the sexuals’ sperm for reproduction, which provide an excellent opportunity for the evolution of fine-tuned species recognition capabilities. Here, we examined if males and females from both parental species (sailfin molly, Poecilia latipinna, and Atlantic molly, P. mexicana) can distinguish between different clonal lineages of the hybrid, all-female Amazon molly (P. formosa). Both males and females were presented with the choice of two different pairings of Amazon mollies: 1) a sympatric female and an allopatric female; and 2) two sympatric females. We found that neither males nor females of sailfin or Atlantic mollies show a preference for a clone type. These results suggest that either the parental species do not have the ability to recognize different Amazon molly clon...

合子前生殖隔离的核心机制之一，是个体识别同种个体的能力。在雌核发育（gynogenetic）物种复合体中，有性宿主物种与依赖有性类群精子完成繁殖的单性物种同域共存，这为演化出精细调控的物种识别能力提供了绝佳研究契机。本研究旨在检验：亲本物种——帆鳍花鳉（Poecilia latipinna）与大西洋花鳉（P. mexicana）的雌雄个体，能否区分杂交起源的全雌性亚马逊花鳉（P. formosa）的不同克隆谱系。实验中，为受试个体提供两种亚马孙花鳉配对选择方案：1）同域雌性个体与异域雌性个体；2）两只同域雌性个体。结果显示，帆鳍花鳉与大西洋花鳉的雌雄个体均未表现出对某一克隆类型的偏好。上述结果表明，要么亲本物种不具备识别不同亚马逊花鳉克隆谱系的能力……