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首页> 外文期刊>Biological invasions >Genetic population structure of invasive nutria (Myocastor coypus) in Louisiana, USA: Is it sufficient for the development of eradication units?
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Genetic population structure of invasive nutria (Myocastor coypus) in Louisiana, USA: Is it sufficient for the development of eradication units?

机译：美国路易斯安那州的入侵性营养杂种（Myocastor coypus）的遗传种群结构：是否足以开发消灭单位？

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摘要

The effective control of invasive mammals, because of their potentially high dispersive capacity, demands an understanding of spatial patterns of gene flow leading to the designation of population units for systematic eradication. Nutria, or coypu (Myocastor coypus), are large, semi-aquatic rodents, originally exported from their native South America for the value of their fur, and are now considered pests on many continents due to overgrazing of wetlands. This study was aimed at assessing the potential for establishing eradication units for the control of nutria in a severely impacted region of the US, southern Louisiana, using nine microsatellite loci, and systematic sampling from each of eight major watershed basins. Unexpectedly high levels of genetic diversity were revealed in comparison to native populations both in terms of numbers of alleles and observed heterozygosities, suggesting that multiple source populations may have originally contributed to the establishment of the Louisiana fur trade, which have subsequently become intermingled. Genetic differentiation among watersheds was nearly undetectable, as evidenced by a very small, albeit significant overall F _(ST) value of 0.0059. Interestingly, one of the Bayesian clustering algorithms used in this study identified 11 populations that may represent a fading remnant of the original source populations, although these clusters were not supported by a coherent pattern of geography. Unfortunately, these findings suggest that neither the establishment of locally manageable eradication units, nor the development of biological control agents known for their close association with a single source population will be effective in the control of Louisiana nutria.
机译：由于其潜在的高分散能力，对侵入性哺乳动物的有效控制要求对基因流的空间模式有一个了解，从而导致为系统根除指定种群单位。 Nutria或海狸鼠（Myocastor coypus）是大型的半水生啮齿动物，最初从其原产南美洲出口，以获取其毛皮的价值，如今由于湿地过度放牧而在许多大洲被视为害虫。这项研究旨在评估使用9个微卫星基因座在美国重灾区路易斯安那州南部建立根除单位来控制坚果的潜力，并从8个主要流域盆地中的每一个进行系统采样。与等位基因数量和观察到的杂合性相比，与本地种群相比，揭示了出乎意料的高水平的遗传多样性，这表明多种来源的种群最初可能对路易斯安那皮草贸易的建立起了一定的作用，后来又相互融合。流域之间的遗传分化几乎无法检测到，尽管很小的整体F _（ST）值为0.0059，但也证明了这一点。有趣的是，本研究中使用的一种贝叶斯聚类算法确定了11个种群，这些种群可能代表了原始源种群的残留，尽管这些簇不受一致的地理模式支持。不幸的是，这些发现表明，建立本地可管理的根除单位，或者开发以与单一来源种群密切联系而闻名的生物防治剂，都不会有效地控制路易斯安那州的营养。

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