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首页> 外文期刊>Journal of Mammalogy >Generalist dispersal and gene flow of an endangered keystone specialist (Dipodomys ingens)
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Generalist dispersal and gene flow of an endangered keystone specialist (Dipodomys ingens)

机译：濒危基石专家的一般分散和基因流（Dipodomys Ingens）

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Movement ecology and dispersal capabilities inherently drive genetic structure across landscapes. Through understanding dispersal and gene flow of giant kangaroo rats (Dipodomys ingens), conservation efforts can be focused, and we can further understand how genetic structure persists in this highly endemic small mammal. Here, we genetically identify parent-offspring and sibship relationships among 239 giant kangaroo rats using 15 microsatellites in the northern part of the species range and describe the individual genetic-spatial variation using a Moran eigenvector map (MEM). We further employ two landscape genetic analyses (isolation by resistance [IBR] and least cost paths [LCPs]) and two individual-based genetic metrics (Dps and a codominant marker distance from GenAlEx) to determine landscape factors (precipitation, slope, vegetation community, and roads) that influence gene flow. We found 19 pairs of related individuals, of which 18 were less than 250 m apart, but one sibling pair was 5.52 km apart, suggesting greater dispersal capabilities than previously noted. We found hierarchal spatial genetic structure using a MEM, with 3-4 genetically similar regions and two genetically similar subregions. Finally, we found low correlative strength between landscape features and gene flow. IBR consistently outperformed LCPs, and there was evidence that regions with 250-350 mm of precipitation and slope <= 5 degrees promoted connectivity. We recommend that managers focus on habitat protection rather than corridor maintenance, with the caveat that anthropogenic factors were minimally considered in this study.
机译：运动生态和扩散能力内在地驱动着整个景观的遗传结构。通过了解巨型袋鼠（Dipodomys ingens）的传播和基因流动，可以集中精力进行保护工作，我们可以进一步了解这种高度特有的小型哺乳动物的遗传结构是如何持续存在的。在这里，我们使用物种范围北部的15个微卫星从遗传学上确定了239只巨型袋鼠的亲子代和兄弟关系，并使用莫兰特征向量图（MEM）描述了个体遗传空间变异。我们进一步采用两种景观遗传分析（按抗性隔离[IBR]和最低成本路径[LCP]）和两种基于个体的遗传指标（Dps和与GenAlEx的共显性标记距离）来确定影响基因流动的景观因素（降水、坡度、植被群落和道路）。我们发现了19对相关个体，其中18对相距不到250米，但一对兄弟姐妹相距5.52公里，这表明它们的扩散能力比之前提到的更强。我们使用MEM发现了具有3-4个遗传相似区域和两个遗传相似亚区域的分层空间遗传结构。最后，我们发现景观特征和基因流之间的相关性很低。IBR的表现始终优于LCP，有证据表明，降水量为250-350毫米且坡度小于等于5度的区域促进了连通性。我们建议管理者将重点放在栖息地保护上，而不是走廊维护上，但需要注意的是，本研究中很少考虑人为因素。

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