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首页> 外文期刊>Conservation genetics >Are invasive marsh frogs (Pelophylax ridibundus) replacing the native P. lessonae/P. esculentus hybridogenetic complex in Western Europe? Genetic evidence from a field study
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Are invasive marsh frogs (Pelophylax ridibundus) replacing the native P. lessonae/P. esculentus hybridogenetic complex in Western Europe? Genetic evidence from a field study

机译：是侵入性沼泽青蛙（Pelophylax Ridibundus）取代本机P. lessonae / p。 西欧的Ecculentus杂交复合物？ 来自田间研究的遗传证据

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摘要

The water-frog L–E system, widespread in Western Europe, comprises the pool frog Pelophylax lessonae and the hybridogenetic edible frog P. esculentus, which originated from hybridization between pool frogs and marsh frogs (P. ridibundus). In P. esculentus, the lessonae (L) genome is eliminated during meiosis and has to be gained anew each generation from a P. lessonae partner, while the ridibundus (R') genome is transmitted clonally. It therefore accumulates deleterious mutations, so that R'R' offspring from P. esculentus9P. esculentus crosses are normally unviable. This system is now threatened by invasive P. ridibundus (RR) imported from Eastern Europe and the Balkans. We investigated the genetic interactions between invasive marsh frogs and native water frogs in a Swiss wetland area, and used genetic data collected in the field to validate several components of a recently postulated mechanism of species replacement. We identified neo-ridibundus individuals derived from crosses between invasive ridibundus and native esculentus, as well as newly arisen hybridogenetic esculentus lineages stemming from crosses between invasive ridibundus (RR) and native lessonae (LL). As their ridibundus genomes are likely to carry less deleterious mutations, such lineages are expected to produce viable ridibundus offspring, contributing to species replacement. However, such crosses with invasive ridibundus only occurred at a limited scale; moreover, RR9LL crosses did not induce any introgression from the ridibundus to the lessonae genome. We did not find any ridibundus stemming from crosses between ancient esculentus lineages. Despite several decades of presence on the site, introduced ridibundus individuals only represent 15 % of sampled frogs, and their spatial distribution seems shaped by specific ecological requirements rather than history of colonization. We therefore expect the three taxa to coexist stably in this area.
机译：西欧广泛的水资源青蛙L-E系统包括池蛙Pelophylax课程和杂交食用青蛙P. esculentus，它起源于池青蛙和沼泽青蛙（P. Ridibundus）之间的杂交。在P. Esculentus中，在减数分裂期间消除了课程（L）基因组，并且必须从P.课程合作伙伴中重新获得每一代，而Ridibundus（R'）基因组克隆地传播。因此，它累积有害突变，从而从P.Sceculentus9p中的后代。 esculentus十字架通常是不可行的。该系统现在由从东欧和巴尔干人口进口的侵入性P. Ridibundus（RR）威胁。我们调查了瑞士湿地区域的侵入式沼泽青蛙和天然水青蛙之间的遗传相互作用，以及在现场收集的遗传数据来验证最近假设物种替代机制的几个组成部分。我们鉴定了来自侵袭性ribulus和本机esculentus之间的交叉的新ribulus的个体，以及新出现的杂交esculyus血管源于侵入性ribulus（rr）和本地课程（ll）之间的交叉。由于其ridibundus基因组可能携带较少的有害突变，因此预计这些谱系将产生可行的ribuluss后代，有助于物种替代品。然而，这种与侵入性ridibundus的十字架仅发生在有限的范围内;此外，RR9LR十字架并没有诱导从ridibundus到课程基因组的任何血气。我们没有发现任何古代Eculentus谱系之间的交叉口的ridibundus。尽管网站上有几十年的存在，但引入的ridibundus个体只占了15％的采样青蛙，它们的空间分布似乎是由特定生态要求而不是殖民化历史形状。因此，我们预计三个分类群将在这一领域稳定地共存。

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