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Habitat disturbance may form subpopulation genetic structure in an invasive rodent species (Myocastor coypus) within a Japanese river system
Landscape and Ecological Engineering ( IF 2 ) Pub Date : 2022-04-30 , DOI: 10.1007/s11355-022-00508-8
Toshihito Takagi , Akane Itabashi , Hinako Aoyama , Shingo Kaneko , Harumi Torii , Ayako Takano , Okimasa Murakami , Hidetoshi B. Tamate

Alien species management can be improved by understanding the population genetic structure of alien species that affect native ecosystems. In this study, we analyzed the spatial genetic structure of nutria (Myocastor coypus), an invasive rodent species in the Yodo River system in Japan, to improve efficiency of management strategies. We performed genetic analyses of mitochondrial DNA (mtDNA) sequences and 13 microsatellite DNA loci from nutria captured at two locations: the Katsura River and Shirokita Cove, in the upper and lower reaches of the Yodo River system, respectively. Three mtDNA haplotypes (N1, N2, and N3) were identified within the Yodo River system, and the same haplotype (N1) was dominant in both the Katsura River and Shirokita Cove populations. Microsatellite variation was low in both populations. The upstream Katsura River population consisted of a single genetic population, whereas the downstream Shirokita Cove population showed a genetic subdivision likely caused by genetic drift. These results suggest that the Yodo River system populations may have originated from the single ancestral populations. Habitat disruptions, such as severe flood events, may have caused the genetic drift observed in these populations and result in the genetic subdivision within a single river system. Additionally, microsatellite DNA analysis showed that in Shirokita Cove, there was significant isolation-by-distance in female nutria and dispersal occurred over relatively short distances. Therefore, when influence of flooding and migration on population dynamics are considered, a combination of localized intensive trapping and extensive monitoring may be necessary to control nutria density.



中文翻译:

栖息地干扰可能在日本河流系统内的入侵啮齿动物物种(Myocastor coypus)中形成亚群遗传结构

通过了解影响本地生态系统的外来物种的种群遗传结构,可以改进外来物种管理。在本研究中,我们分析了海狸鼠 ( Myocastor coypus ) 的空间遗传结构。),日本淀川系统中的一种入侵啮齿动物物种,以提高管理策略的效率。我们对分别在淀川上游和下游的桂川和白北湾这两个地点捕获的海狸鼠的线粒体 DNA (mtDNA) 序列和 13 个微卫星 DNA 基因座进行了遗传分析。在淀川系统内鉴定出三种 mtDNA 单倍型(N1、N2 和 N3),并且相同的单倍型(N1)在桂川和白北湾种群中占主导地位。两个种群的微卫星变异都很低。桂川上游种群由单一遗传种群组成,而下游白北湾种群显示出可能由遗传漂变引起的遗传细分。这些结果表明,淀川系统种群可能起源于单一的祖先种群。栖息地破坏,例如严重的洪水事件,可能导致在这些种群中观察到遗传漂移,并导致单个河流系统内的遗传细分。此外,微卫星 DNA 分析表明,在白北湾,雌性海狸鼠存在明显的距离隔离,并且在相对较短的距离内发生扩散。因此,当考虑洪水和迁移对种群动态的影响时,可能需要结合局部密集诱捕和广泛监测来控制海狸鼠密度。可能导致在这些种群中观察到的遗传漂移,并导致单个河流系统内的遗传细分。此外,微卫星 DNA 分析表明,在白北湾,雌性海狸鼠存在明显的距离隔离,并且在相对较短的距离内发生扩散。因此,当考虑洪水和迁移对种群动态的影响时,可能需要结合局部密集诱捕和广泛监测来控制海狸鼠密度。可能导致在这些种群中观察到的遗传漂移,并导致单个河流系统内的遗传细分。此外,微卫星 DNA 分析表明,在白北湾,雌性海狸鼠存在明显的距离隔离,并且在相对较短的距离内发生扩散。因此,当考虑洪水和迁移对种群动态的影响时,可能需要结合局部密集诱捕和广泛监测来控制海狸鼠密度。

更新日期:2022-05-03
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