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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Invasive hybrid tiger salamander genotypes impact native amphibians
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Invasive hybrid tiger salamander genotypes impact native amphibians

机译：外来杂种虎sal的基因型影响本地两栖动物

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Although the ecological consequences of species invasions are well studied, the ecological impacts of genetic introgression through hybridization are less understood. This is particularly true of the impacts of hybridization on "third party" community members not genetically involved in hybridization. We also know little about how direct interactions between hybrid and parental individuals influence fitness. Here, we examined the ecological effects of hybridization between the native, threatened California Tiger Salamander (Amby-stoma californiense) and the introduced Barred Tiger Salamander (Ambystoma tigrinum mavortium). Native x introduced hybrids are widespread in California, where they are top predators in seasonal ponds. We examined the impacts of early generation hybrids (first 2 generations of parental crosses) and contemporary hybrids derived from ponds where hybrids have been under selection in the wild for 20 generations. We found that most classes of hybrid tiger salamander larvae dramatically reduced survival of 2 native community members, the Pacific Chorus Frog (Pseudacris regilla) and the California Newt {Taricha torosa). We also found that native A. californiense larvae were negatively impacted by the presence of hybrid larvae: Native survival and size at metamorphosis were reduced and time to metamorphosis was extended. We also observed a large influence of Mendelian dominance on size, metamorphic timing and predation rate of hybrid tiger salamanders. These results suggest that both genetic and ecological factors are likely to influence the dynamics of admixture, and that tiger salamander hybridization might constitute a threat to additional pond-breeding species of concern in the region.
机译：尽管对物种入侵的生态后果进行了很好的研究，但通过杂交对基因渗入的生态影响却知之甚少。杂交对没有遗传参与杂交的“第三方”社区成员的影响尤其如此。我们也很少了解杂种和父母个体之间的直接互动如何影响健康。在这里，我们研究了本地濒危的加利福尼亚虎Sal（Amby-stoma californiense）和引入的条纹虎Bar（Ambystoma tigrinum mavortium）之间杂交的生态影响。引入本地x的杂交种在加利福尼亚州很普遍，它们是季节性池塘中的顶级捕食者。我们研究了早期杂交种（父母代杂交的前2代）和来源于池塘的当代杂交种的影响，这些池塘在野生环境中已经选择了20代杂交种。我们发现，大多数种类的杂交虎sal幼虫都大大降低了两个本地社区成员的生存，即太平洋合唱蛙（Pseudacris regilla）和加利福尼亚New（Taricha torosa）。我们还发现，杂种幼虫的存在对当地的加州产A. californiense幼虫产生了负面影响：降低了原生生物的存活率和变态大小，延长了变态时间。我们还观察到孟德尔优势对杂种老虎sal的大小，变质时间和捕食率的影响很大。这些结果表明，遗传因素和生态因素都可能影响混合物的动力学，虎sal杂交可能对该地区其他池塘养殖物种构成威胁。

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