D M Wuitchik, J E Fifer, A K Huzar, J A Pechenik, L H Uricchio, S W Davies
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引用次数: 0
Abstract
Intertidal organisms withstand extreme temperature fluctuations, and theirability to cope with this variation may affect their distributions across the seascape. Genetic variation and local environments likely interact to determine variation in thermal performances across intertidal species' ranges, so characterizing the relationship between temperature variation and population structure is key to understanding the biology of marine invertebrates. Here, we use 2bRAD-sequencing to examine population genetic structure in two congeneric intertidal marine gastropods (Crepidula fornicata, C. plana), sampled from locations along a natural temperature gradient on the Northeast shores of the United States. These two species share similar life histories, yet C. plana exhibits a narrower distribution than C. fornicata. Our results demonstrate that both species show patterns of genetic divergence consistent with isolation by distance, though this pattern was only significant in C. fornicata. Both putatively selected and neutral loci displayed significant spatial structuring in C. fornicata; however, only putatively selected loci showed significant clustering in C. plana. When exploring whether temperature differences explained genetic differentiation, we found that 9-12% of genetic differentiation was explained by temperature variation in each species even when controlling for latitude and neutral population structure. Our results suggest that temperature shapes adaptive variation across the seascape in both Crepidula species and encourages further research to differentiate our results from models of neutral evolutionary drift.
潮间带生物能够承受极端的温度波动,它们应对这种变化的能力可能会影响它们在整个海景中的分布。遗传变异和当地环境可能相互作用,决定了潮间带物种范围内热性能的变化,因此表征温度变化与种群结构之间的关系是了解海洋无脊椎动物生物学的关键。在这里,我们使用2brada测序来检测两种同属潮间带海洋腹足类(Crepidula fornicata, C. plana)的种群遗传结构,样本来自美国东北海岸沿自然温度梯度的地点。这两个物种有着相似的生活史,但plana的分布范围比fornicata要窄。我们的研究结果表明,两个物种的遗传分化模式与距离隔离一致,尽管这种模式仅在C. fornicata中显著。假设选择位点和中性位点均表现出显著的空间结构;然而,只有假设选择的基因座在plana中显示出显著的聚类。在探讨温度差异是否解释遗传分化时,我们发现即使在纬度和中性种群结构的控制下,每个物种的9-12%的遗传分化是由温度变化解释的。我们的研究结果表明,温度影响了两种Crepidula物种在整个海景中的适应性变化,并鼓励进一步的研究将我们的结果与中性进化漂变模型区分开来。
期刊介绍:
BMC Genomics is an open access, peer-reviewed journal that considers articles on all aspects of genome-scale analysis, functional genomics, and proteomics.
BMC Genomics is part of the BMC series which publishes subject-specific journals focused on the needs of individual research communities across all areas of biology and medicine. We offer an efficient, fair and friendly peer review service, and are committed to publishing all sound science, provided that there is some advance in knowledge presented by the work.