Gene flow and climate‐associated genetic variation in a vagile habitat specialist
Gene flow and climate‐associated genetic variation in a vagile habitat specialist
复制标题
迷走栖息地专家的基因流和与气候相关的遗传变异
作者：
Zachary G. MacDonald;J. Dupuis;C. Davis;J. Acorn;S. Nielsen;F. Sperling
景观遗传学先前的研究表明，地理隔离比环境条件的变化对遗传分化更重要。当适宜生境的配置是限制扩散和基因流动的主要因素时，这是直观的，但对于具有强扩散能力的生境专家来说，这还没有得到彻底的检验。本文研究了地理隔离和环境隔离对一种具有高度生境特异性和离散分散生命阶段的无脊椎动物——美国东半球燕尾蝶遗传分化的影响。在加拿大，P. m. dodi一般局限于沿其幼虫寄主植物发生的主要河谷侵蚀栖息地。一系列因果和线性混合效应模型表明，全基因组单核苷酸多态性的差异最好由环境隔离（夏季温度变化）和地理隔离（欧几里得距离）的组合来解释。有趣的是，通过电阻表面参数化的最小成本路径和电路距离不支持作为栖息地适宜性的逆参数。这表明，尽管许多蝴蝶的栖息地关联是由于繁殖需求而特定的，但由于相当大的成虫性，栖息地适宜性和景观渗透性并不是等价的概念。我们推断，与夏季温度变化相关的差异选择在多迪斑蝶中产生了两个遗传簇，它们在voltinism和滞育倾向上存在差异。在下个世纪，预计气温的上升幅度将超过目前遗传集群区域之间的差异，这可能会影响北部集群在持续气候变化下的持久性。
Previous work in landscape genetics suggests that geographic isolation is of greater importance to genetic divergence than variation in environmental conditions. This is intuitive when configurations of suitable habitat are a dominant factor limiting dispersal and gene flow, but has not been thoroughly examined for habitat specialists with strong dispersal capability. Here, we evaluate the effects of geographic and environmental isolation on genetic divergence for a vagile invertebrate with high habitat specificity and a discrete dispersal life stage: Dod's Old World swallowtail butterfly, Papilio machaon dodi. In Canada, P. m. dodi are generally restricted to eroding habitat along major river valleys where their larval host plant occurs. A series of causal and linear mixed effects models indicate that divergence of genome‐wide single nucleotide polymorphisms is best explained by a combination of environmental isolation (variation in summer temperatures) and geographic isolation (Euclidean distance). Interestingly, least‐cost path and circuit distances through a resistance surface parameterized as the inverse of habitat suitability were not supported. This suggests that, although habitat associations of many butterflies are specific due to reproductive requirements, habitat suitability and landscape permeability are not equivalent concepts due to considerable adult vagility. We infer that divergent selection related to variation in summer temperatures has produced two genetic clusters within P. m. dodi, differing in voltinism and diapause propensity. Within the next century, temperatures are predicted to rise by amounts greater than the present‐day difference between regions of the genetic clusters, potentially affecting the persistence of the northern cluster under continued climate change.
影响因子：
3.3
作者：
J. K. Pritchard;Matthew Stephens;Peter Donnelly
通讯作者：
J. K. Pritchard;Matthew Stephens;Peter Donnelly
DOI：
10.1073/pnas.87.3.1139
发表时间：
1990-02-01
影响因子：
11.1
作者：
TULJAPURKAR, S
通讯作者：
TULJAPURKAR, S