School of Life Sciences, Anhui University, Hefei, Anhui, China.
Anhui Province Key Laboratory for Conservation and Exploitation of Biological Resource, College of Life Sciences, Anhui Normal University, Wuhu, Anhui, China.
Integr Zool. 2024 Sep;19(5):863-886. doi: 10.1111/1749-4877.12764. Epub 2023 Oct 25.
Global climate change is expected to have a profound effect on species distribution. Due to the temperature constraints, some narrow niche species could shift their narrow range to higher altitudes or latitudes. In this study, we explored the correlation between species traits, genetic structure, and geographical range size. More specifically, we analyzed how these variables are affected by differences in fundamental niche breadth or dispersal ability in the members of two sympatrically distributed stream-dwelling amphibian species (frog, Quasipaa yei; salamander, Pachyhynobius shangchengensis), in Dabie Mountains, East China. Both species showed relatively high genetic diversity in most geographical populations and similar genetic diversity patterns (JTX, low; BYM, high) correlation with habitat changes and population demography. Multiple clustering analyses were used to disclose differentiation among the geographical populations of these two amphibian species. Q. yei disclosed the relatively shallow genetic differentiation, while P. shangchengensis showed an opposite pattern. Under different historical climatic conditions, all ecological niche modeling disclosed a larger suitable habitat area for Q. yei than for P. shangchengensis; these results indicated a wider environment tolerance or wider niche width of Q. yei than P. shangchengensis. Our findings suggest that the synergistic effects of environmental niche variation and dispersal ability may help shape genetic structure across geographical topology, particularly for species with extremely narrow distribution.
全球气候变化预计将对物种分布产生深远影响。由于温度的限制，一些生态位狭窄的物种可能会将其狭窄的分布范围转移到更高的海拔或纬度。在这项研究中，我们探讨了物种特征、遗传结构和地理范围大小之间的相关性。更具体地说，我们分析了这些变量如何受到基本生态位宽度或扩散能力差异的影响，这两个变量在两个分布于同一地区的溪流两栖动物物种（青蛙，Quasipaa yei；蝾螈，Pachyhynobius shangchengensis）成员中。这两个物种在大多数地理种群中表现出相对较高的遗传多样性，并且与栖息地变化和种群动态具有相似的遗传多样性模式（JTX，低；BYM，高）相关。通过多重聚类分析揭示了这两个两栖物种的地理种群之间的分化。Q. yei 表现出相对较浅的遗传分化，而 P. shangchengensis 则表现出相反的模式。在不同的历史气候条件下，所有生态位建模都揭示了 Q. yei 的适宜栖息地面积大于 P. shangchengensis；这些结果表明 Q. yei 的环境容忍度或生态位宽度比 P. shangchengensis 更宽。我们的研究结果表明，环境生态位变化和扩散能力的协同作用可能有助于塑造地理拓扑结构上的遗传结构，特别是对于分布极为狭窄的物种。
