Guangxi Key Laboratory of Rare and Endangered Animal Ecology, College of Life Science, Guangxi Normal University, Guilin, 541004, China.
Sci Rep. 2017 Aug 15;7(1):8272. doi: 10.1038/s41598-017-08552-3.
Discerning the dispersal patterns of invasive species is critically important for the design of effective management strategies and the development of appropriate theoretical models predicting the spatial expansion of introduced populations. Post-introduction dispersal may occur naturally or via human transport, but for many organisms, assessing the relative contribution of each of these factors is difficult using traditional methods. Here, we explored the genetic patterns associated with the spread of red swamp crayfish (Procambarus clarkii) among 21 populations in the Pearl River basin and 2 peripheral populations in the Yangtze River basin. We found the genetic diversity of P. clarkii in the Pearl River basin was somewhat lower than in the Yangtze River basin. We also found (1) there was significant genetic differentiation between populations, (2) genetic differentiation was not related to geographic distance (i.e., isolation by distance), and (3) a Bayesian assignment analysis revealed three distinct genetic clusters and genetic admixture. Our results therefore provide evidence that human-mediated multiple introductions occurred in the Pearl River basin. Anthropogenic activities such as commercial transportation were likely responsible for the long-distance dispersal of P. clarkii. This study provides useful information for developing management strategies.
辨别入侵物种的扩散模式对于设计有效的管理策略和开发适当的理论模型来预测引入种群的空间扩展至关重要。引入后的扩散可能是自然发生的，也可能是通过人类运输发生的，但对于许多生物来说，使用传统方法评估这两个因素的相对贡献是困难的。在这里，我们探讨了与珠江流域 21 个种群和长江流域 2 个边缘种群中红沼泽小龙虾（Procambarus clarkii）传播相关的遗传模式。我们发现，珠江流域 P. clarkii 的遗传多样性略低于长江流域。我们还发现（1）种群之间存在显著的遗传分化，（2）遗传分化与地理距离（即距离隔离）无关，（3）贝叶斯分配分析显示存在三个不同的遗传群和遗传混合。因此，我们的研究结果提供了证据表明，人类介导的多次引入发生在珠江流域。商业运输等人为活动可能是 P. clarkii 远距离扩散的原因。本研究为制定管理策略提供了有用的信息。
