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Propagule pressure and hunting pressure jointly determine genetic evolution in insular populations of a global frog invader

文献类型： 外文期刊

作者： Wang, Supen 1 ; Liu, Conghui 1 ; Wu, Jun 3 ; Xu, Chunxia 1 ; Zhang, Jiaqi 1 ; Bai, Changming 4 ; Gao, Xu 1 ; Liu, Xuan 1 ; L 1 ;

作者机构： 1.Chinese Acad Sci, Key Lab Anim Ecol & Conservat Biol, Inst Zool, 1 Beichen West Rd, Beijing 100101, Peoples R China

2.Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing 100049, Peoples R China

3.Minist Environm Protect China, Nanjing Inst Environm Sci, 8 Jiang Wang Miao St, Nanjing 210042, Jiangsu, Peoples R China

4.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Minist Agr, Key Lab Sustainable Dev Marine Fisheries, Qingdao 266071, Peoples R China

5.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2019 年 9 卷

页码：

收录情况： SCI

摘要： Islands are often considered to be more susceptible to biological invasions and to suffer greater impacts from invaders than mainland areas, and this difference is generally attributed to differences in species introductions, ecological factors or human activities between islands and mainland areas. Genetic variation, as a good estimate of evolutionary potential, can influence the invasion process and impacts of alien species. However, few studies have compared the genetic diversity of alien species between islands and a corresponding mainland. Here, we examined the genetic variation and differentiation in feral populations (30 sampled individuals/population) of a globally invasive species (the American bullfrog, Lithobates catesbeianus) that was extensively farmed on 14 islands in the Zhoushan Archipelago of China and in three nearby regions on the mainland. We quantified the relative importance of propagule pressure and hunting pressures on the genetic variation of bullfrog populations and found that insular populations have greater genetic variation than their mainland counterparts. Although genetic differentiation between the populations was observed, no evidence of recent bottlenecks or population expansion in any of the tested population was found. Our results suggest that the propagule pressures of bullfrogs escaping from farms, multiple releases and hunting pressure influence the genetic variation among bullfrog populations. These results might have important implications for understanding the establishment and evolution of alien species on islands and for the management of invasive species.

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