An impact assessment of the alien lizard Plestiodon japonicus (Scincidae, Reptilia) on a threatened island population of the native lizard P. latiscutatus at an early phase of the biological invasion
An impact assessment of the alien lizard Plestiodon japonicus (Scincidae, Reptilia) on a threatened island population of the native lizard P. latiscutatus at an early phase of the biological invasion
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DOI：
10.1007/s10530-013-0429-8
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发表时间：
2013-02
影响因子：
2.9
通讯作者：
T. Okamoto;Takeo Kuriyama;K. Goka
中科院分区：
文献类型：
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作者：
T. Okamoto;Takeo Kuriyama;K. Goka
在日本中部的八丈岛岛上，原本有大量的本地蜥蜴，Plestiodon latiscutatus已经因为外来黄鼠狼（Mustela itatsi）的捕食而濒临灭绝。最近，一种名为P.P.的外来蜥蜴在岛上定居下来。通过实地调查和DNA分析评估了外来蜥蜴的影响和本地蜥蜴的当前分布。本土蜥蜴在岛屿西部分布稀少。这种外来蜥蜴出现在岛屿的东北部地区。在这些区域之间，鉴定了几个杂交群体，包括一些具有非F1基因型的群体，这表明正在发生基因渗入。黄鼠狼的分布进行了检查的基础上，实地观察，使我们能够估计捕食者的蜥蜴物种的影响。我们发现了黄鼠狼遍布整个岛屿的证据，这表明尽管有黄鼠狼的存在，外星蜥蜴还是能够建立起来。这表明，外来蜥蜴可能会扩大其栖息地范围，基因渗入可能会蔓延。我们的结论是P. latiscutatuspopulations将越来越受到来自P.以及来自黄鼠狼的捕食压力。
On the island of Hachijojima, central Japan, a formerly abundant population of native lizard,Plestiodon latiscutatushas become endangered by predation from an alien weasel (Mustela itatsi). Recently, an alien lizard,P. japonicus, became established on the island. The impact of the alien lizard and current distribution of the native lizard were assessed by field surveys and DNA analyses. The native lizard was sparsely distributed in the western part of the island. The alien lizard occurred in the northeastern region of the island. Between these regions, several hybrid populations were identified, including some with non-F1 genotypes, suggesting that introgression is occurring. The distribution of the weasel was examined based on field observations, allowing us to estimate predator impacts on both lizard species. We found evidence that the weasel was present throughout the entire island, suggesting that the alien lizard was able to become established despite the presence of the weasel. This indicates that the alien lizard is likely to expand its habitat range and that introgression may spread. We conclude thatP. latiscutatuspopulations will become increasingly endangered by the synergism of genetic introgression fromP. japonicusand predation pressure from the weasel.