Habitat distribution influences dispersal and fine-scale genetic population structure of eastern foxsnakes (Mintonius gloydi) across a fragmented landscape
Habitat distribution influences dispersal and fine-scale genetic population structure of eastern foxsnakes (Mintonius gloydi) across a fragmented landscape
复制标题
DOI：
10.1111/j.1365-294x.2010.04872.x
复制
发表时间：
2010-12-01
影响因子：
4.9
通讯作者：
Lougheed, Stephen C.
中科院分区：
文献类型：
--
作者：
Row, Jeffrey R.;Blouin-Demers, Gabriel;Lougheed, Stephen C.
扩散是自然界中物种的一个基本属性，并在空间和时间尺度上塑造种群动态，进化轨迹和遗传变异。越来越清楚的是，景观特征对扩散模式有很大的影响。因此，了解个体和物种如何在景观中移动对于预测景观变化的影响至关重要。然而，对于许多分类群，特别是爬行动物，缺乏关于扩散模式的信息。东部狐蛇（Mintoinus gloydi）是沼泽和草原专家，避免农田，但他们一直坚持在西南部安大略和北方俄亥俄州的一个支离破碎的地区。在这里，我们结合栖息地适宜性建模与人口遗传分析，推断如何狐蛇分散通过栖息地镶嵌的自然和改变景观功能。通过分配测试确定的八个遗传聚类之间的边界区域由低适宜性栖息地（e. G.农业用地）。岛屿人口被分组为一个单一的遗传簇，和相对较低的F-ST值之间的岛屿和大陆的人口表明开放水域提出了一个障碍比不合适的陆地栖息地。隔离电阻和最低成本的路径分析产生了类似的结果与矩阵的成对个体遗传距离显着相关矩阵的电阻值来自栖息地的适宜性比模型与未分化的景观。空间自相关结果匹配更好的分配结果时，将电阻值，而不是直线距离。在我们的研究中使用的所有分析产生了类似的结果表明，栖息地退化限制了狐蛇的扩散，这对整个地区的遗传种群结构产生了强烈的影响。
Dispersal is a fundamental attribute of species in nature and shapes population dynamics, evolutionary trajectories and genetic variation across spatial and temporal scales. It is increasingly clear that landscape features have large impacts on dispersal patterns. Thus, understanding how individuals and species move through landscapes is essential for predicting impacts of landscape alterations. Information on dispersal patterns, however, is lacking for many taxa, particularly reptiles. Eastern foxsnakes (Mintoinus gloydi) are marsh and prairie specialists that avoid agricultural fields, but they have persisted across a fragmented region in southwestern Ontario and northern Ohio. Here, we combined habitat suitability modelling with population genetic analyses to infer how foxsnakes disperse through a habitat mosaic of natural and altered landscape features. Boundary regions between the eight genetic clusters, identified through assignment tests, were comprised of low suitability habitat (e. g. agricultural fields). Island populations were grouped into a single genetic cluster, and comparatively low F-ST values between island and mainland populations suggest open water presents less of a barrier than nonsuitable terrestrial habitat. Isolation by resistance and least-cost path analysis produced similar results with matrices of pairwise individual genetic distance significantly more correlated to matrices of resistance values derived from habitat suitability than models with an undifferentiated landscape. Spatial autocorrelation results matched better with assignment results when incorporating resistance values rather than straight-line distances. All analyses used in our study produced similar results suggesting that habitat degradation limits dispersal for foxsnakes, which has had a strong effect on the genetic population structure across this region.