Drivers of neutral and adaptive differentiation in pike (Esox lucius) populations from contrasting environments

Understanding how eco-evolutionary processes and environmental factors drive population differentiation and adaptation are key challenges in evolutionary biology of relevance for biodiversity protection. Differentiation requires at least partial reproductive separation, which may result from different modes of isolation such as geographic isolation (allopatry) or isolation by distance (IBD), resistance (IBR), and environment (IBE). Despite that multiple modes might jointly influence differentiation, studies that compare the relative contributions are scarce. Using RADseq, we analyse neutral and adaptive genetic diversity and structure in 11 pike (Esox lucius) populations along a latitudinal gradient (54.9 - 63.6°N), to investigate the relative effects of IBD, IBE and IBR, and to assess whether the effects differ between neutral and adaptive variation, or across structural levels. Patterns of neutral and adaptive variation differed, likely reflecting that they have been differently affec...

阐明生态进化过程与环境因子如何推动种群分化与适应性演化，是进化生物学领域与生物多样性保护相关的核心研究难题。种群分化至少需要部分生殖隔离，而这类隔离可由多种隔离模式介导，例如地理隔离（异域隔离，allopatry）、距离隔离（IBD）、阻力隔离（IBR）与环境隔离（IBE）。尽管多种隔离模式可能共同影响种群分化，但目前对比各类模式相对贡献的研究仍较为匮乏。本研究采用限制性位点关联DNA测序（RADseq）技术，对沿纬度梯度（北纬54.9°至63.6°）分布的11个白斑狗鱼（Esox lucius）种群的中性与适应性遗传多样性及遗传结构展开分析，旨在探究距离隔离（IBD）、环境隔离（IBE）与阻力隔离（IBR）的相对效应，并评估这些效应在中性与适应性遗传变异之间，或是不同结构层级间是否存在差异。中性与适应性遗传变异的分布模式存在差异，这大概率反映二者受到的影响机制有所不同……