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Post-zygotic selection against parental genotypes during larval development maintains all-hybrid populations of the frog Pelophylax esculentus

机译:幼虫发育过程中针对亲本基因型的合子后选择维持了青蛙Pelophylax esculentus的所有杂种种群

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摘要

BackgroundHybridization between two species usually leads to inviable or infertile offspring, due to endogenous or exogenous selection pressures. Yet, hybrid taxa are found in several plant and animal genera, and some of these hybrid taxa are ecologically and evolutionarily very successful. One example of such a successful hybrid is the water frog, Pelophylax esculentus which originated from matings between the two species P. ridibundus (genotype RR) and P. lessonae (LL). At the northern border of the distribution all-hybrid populations consisting of diploid (LR) and one or two triploid (LLR, LRR) frog types have been established. Here, the hybrid has achieved reproductive independence from its sexual ancestors and forms a self-sustaining evolutionary unit. Based on the gamete production of these hybrids, certain mating combinations should lead to LL and RR offspring, but these parental forms are absent among the adults.
机译:背景由于内生或外生选择压力,两个物种之间的杂交通常导致后代不育或不育。然而,在几种动植物种类中都发现了杂种类群,其中一些杂种类在生态和进化上都非常成功。这种成功的杂种的一个例子是水蛙,Pelophylax esculentus,它起源于两个物种P. ridibundus(基因型RR)和L.lessonae(LL)之间的交配。在分布的北部边界,已经建立了由二倍体(LR)和一种或两种三倍体(LLR,LRR)青蛙类型组成的全杂交种群。在这里,杂种已经实现了脱离其性祖先的生殖独立,并形成了一个自我维持的进化单位。基于这些杂种的配子产生,某些交配组合应导致LL和RR的后代,但成年个体中不存在这些亲本形式。

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