Role of habitat heterogeneity and landscape connectivity in shaping gene flow and spatial population structure of a dominant rodent species in a tropical dry forest
Role of habitat heterogeneity and landscape connectivity in shaping gene flow and spatial population structure of a dominant rodent species in a tropical dry forest
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DOI：
10.1111/jzo.12307
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发表时间：
2016-04-01
影响因子：
2
通讯作者：
Vazquez-Dominguez, E.
中科院分区：
文献类型：
--
作者：
Garrido-Garduno, T.;Tellez-Valdes, O.;Vazquez-Dominguez, E.
评估栖息地异质性和景观连通性如何影响基因流和空间种群结构的细尺度种群过程是理解动物扩散的关键。Liomys pictus是一种生活在热带干燥落叶和半落叶森林中的啮齿类动物，在那里它是一个优势，丰富的物种，也是生态系统中的关键因素，作为种子传播者。在细尺度上，研究了景观特征是如何影响羊草的遗传结构和基因流的。pictus种群在一个良好的保护自然环境。在L. pictus的生态特征（如优势种，女性philopatry），我们预测，森林地区（不考虑植被类型）应促进扩散，如果森林植被作为一种走廊，这些模式将是不同的性别。我们测试了这些假设（104个人，6个采样地点，14个微卫星位点）后，检查离散的遗传群体，使用贝叶斯聚类方法，通过评估景观变量对模式的基因流相结合的曼特尔和部分曼特尔测试，最小成本路径和电路理论的影响。L. pictus分化成遗传集群划定明确的景观边界。因此，阻力假说的结果表明，降水和河流渠道的主要环境和景观属性影响基因流。大多数移民的交流检测到从中心到其他采样地点，表明更高的分散在整个落叶和半落叶林走廊，而隔离的距离只为女性。我们的方法使我们能够阐明动物的环境空间利用，确定一些景观特征与物种的传播模式，这可以作为研究和比较与其他热带森林和物种的基础。它也可以有保护应用，例如，保护森林走廊，我们确定为重要的传播可能有利于其他共同分布，受威胁的啮齿动物物种。
Evaluating how habitat heterogeneity and landscape connectivity influence fine-scale population processes of gene flow and spatial population structure is key for understanding animal dispersal. Liomys pictus is a heteromyid rodent that inhabits tropical dry deciduous and semideciduous forests, where it is a dominant, abundant species and a key element on the ecosystem as seed disperser. We evaluated how landscape features shaped the genetic structure and gene flow at a fine scale among L. pictus populations in a well-conserved natural environment. On the basis of L. pictus ecological characteristics (e.g. dominant species, female philopatry), we predicted that forested areas (irrespective of vegetation type) should facilitate dispersal if the forest vegetation acted as a kind of corridor, and that these patterns will be different between sexes. We tested these assumptions (104 individuals, six sampling localities, 14 microsatellite loci) after checking for discrete genetic groups using Bayesian clustering methods, by assessing the effect of landscape variables on patterns of gene flow combining Mantel and partial Mantel tests, least-cost path and circuit theories. L. pictus differentiated into genetic clusters delimited by clear landscape boundaries. Accordingly, resistance hypotheses results showed that precipitation and stream channels were the main environmental and landscape attributes influencing gene flow. Exchange of a majority of migrants was detected from the center into other sampling localities, indicating higher dispersal throughout deciduous and semideciduous forest corridors, whereas isolation by distance was found only for females. Our approach allowed us to elucidate animal environmental space use, identifying some of the landscape features linked to the species dispersal patterns, which can serve as a basis for the study and comparison with other tropical forests and species. It can also have conservation applications, for instance, preserving the forested corridors we identified as significant for dispersal can likely benefit other codistributed, threatened rodent species.