Disentangling effects of dispersal, environment and anthropogenic barriers on functional connectivity in aquatic systems

IF 4.5 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Casey C. Day, Dominique Alò, Ryan K. Simmons, Stacy R. Cotey, Katherine E. Zarn, Ian F. Gazeley, Maureen Small, Marie-Josee Fortin, Andrew R. Bearlin, Seth R. Smith, Erin L. Landguth
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引用次数: 0

Abstract

Disentangling the roles of structural landscape factors and animal movement behaviour can present challenges for practitioners managing landscapes to maintain functional connectivity and achieve conservation goals. We used a landscape genetics approach to combine robust demographic, behavioural and genetic datasets with spatially explicit simulations to evaluate the effects of anthropogenic barriers (dams, culverts) and natural landscape resistance (gradient, elevation) affecting dispersal behaviour, genetic connectivity and genetic structure in a resident population of Westslope Cutthroat Trout (Oncorhynchus clarkii lewisi). Analyses based on 10 years of sampling effort revealed a pattern of restricted dispersal, and population genetics identified discrete population clusters between distal tributaries and the mainstem stream and no structure within the mainstem stream. Demogenetic simulations demonstrated that, for this population, the effects of existing anthropogenic barriers on population structure are redundant with effects of restricted dispersal associated with the underlying environmental resistance. Our approach provides an example of how extensive field sampling combined with landscape genetics can be incorporated into spatially explicit simulation modelling to explore how, together, movement ecology and landscape resistance can be used to inform decisions around restoration and connectivity.

消除扩散、环境和人为障碍对水生系统功能连通性的影响。
对于管理景观以保持功能连通性和实现保护目标的实践者来说,厘清景观结构因素和动物运动行为的作用是一项挑战。我们采用景观遗传学方法,将可靠的人口、行为和遗传数据集与空间明确的模拟相结合,评估人为障碍(水坝、涵洞)和自然景观阻力(梯度、海拔)对西坡切喉鳟(Oncorhynchus clarkii lewisi)常住种群的扩散行为、遗传连通性和遗传结构的影响。基于 10 年采样工作的分析表明,该种群的扩散行为受到限制,种群遗传学发现远端支流和干流之间存在离散的种群集群,而干流内部没有结构。去遗传学模拟表明,对该种群而言,现有人为障碍对种群结构的影响是多余的,与潜在环境阻力相关的限制性扩散影响也是多余的。我们的方法提供了一个实例,说明如何将广泛的野外取样与景观遗传学相结合,纳入空间明确的模拟建模中,以探索如何将运动生态学和景观阻力结合起来,为有关恢复和连通性的决策提供信息。
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来源期刊
Molecular Ecology
Molecular Ecology 生物-进化生物学
CiteScore
8.40
自引率
10.20%
发文量
472
审稿时长
1 months
期刊介绍: Molecular Ecology publishes papers that utilize molecular genetic techniques to address consequential questions in ecology, evolution, behaviour and conservation. Studies may employ neutral markers for inference about ecological and evolutionary processes or examine ecologically important genes and their products directly. We discourage papers that are primarily descriptive and are relevant only to the taxon being studied. Papers reporting on molecular marker development, molecular diagnostics, barcoding, or DNA taxonomy, or technical methods should be re-directed to our sister journal, Molecular Ecology Resources. Likewise, papers with a strongly applied focus should be submitted to Evolutionary Applications. Research areas of interest to Molecular Ecology include: * population structure and phylogeography * reproductive strategies * relatedness and kin selection * sex allocation * population genetic theory * analytical methods development * conservation genetics * speciation genetics * microbial biodiversity * evolutionary dynamics of QTLs * ecological interactions * molecular adaptation and environmental genomics * impact of genetically modified organisms
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