Genetic and phenotypic variation exhibit both predictable and stochastic patterns across an intertidal fish metapopulation
Genetic and phenotypic variation exhibit both predictable and stochastic patterns across an intertidal fish metapopulation
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潮间带鱼类集合种群的遗传和表型变异表现出可预测和随机模式
DOI：
10.1111/mec.15829
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发表时间：
2021
影响因子：
4.9
通讯作者：
Riginos, Cynthia
中科院分区：
文献类型：
--
作者：
Thia, Joshua A.;McGuigan, Katrina;Liggins, Libby;Figueira, Will F.;Bird, Christopher E.;Mather, Andrew;Evans, Jennifer L.;Riginos, Cynthia
选择、基因流动和漂移之间的相互作用影响着适应性进化的轨迹。在自然种群中，这些过程的方向和大小在不同的空间、时间或个体发育尺度上可能是不同的。因此，进化过程中的可变性会影响微观进化结果的可预测性或随机性。我们研究了潮间带鱼类Bathygobius cocosis(Bleeker，1854)，以了解在一个具有潜在广泛扩散和复杂生活周期(幼虫在底栖动物补充之前扩散)的物种中，空间、时间和生命阶段是如何构成遗传和表型变异的。我们在三个地点对青少年和成人的生命阶段进行了为期三年的抽样。全基因组的SNPs揭示了一种混乱的遗传斑块模式，即微弱但显著的斑块空间遗传结构，这种结构在时间和生命阶段之间是可变的。离群点分析表明，空间差异选择的目标大多在时间上是可变的，尽管有相当数量的空间离群点在生活阶段之间是共享的。头部形状，一种假定的生态响应(适应)表型INB。协同敏感性也在地点内表现出高度的时间变异性。然而，地点之间一致的空间关系表明，地点之间的环境相似性可能会产生可预测的空间表型分布。我们的研究突出了海洋系统复杂的微观进化动力学，其中考虑多个生态维度可以揭示遗传和表型变异分布的可预测和随机模式。这些考虑可能适用于具有短而复杂的生命周期、具有较大的传播潜力和繁殖力以及生活在异质环境中的物种。
Interactions among selection, gene flow, and drift affect the trajectory of adaptive evolution. In natural populations, the direction and magnitude of these processes can be variable across different spatial, temporal, or ontogenetic scales. Consequently, variability in evolutionary processes affects the predictability or stochasticity of microevolutionary outcomes. We studied an intertidal fish,Bathygobius cocosensis(Bleeker, 1854), to understand how space, time, and life stage structure genetic and phenotypic variation in a species with potentially extensive dispersal and a complex life cycle (larval dispersal preceding benthic recruitment). We sampled juvenile and adult life stages, at three sites, over three years. Genome‐wide SNPs uncovered a pattern of chaotic genetic patchiness, that is, weak‐but‐significant patchy spatial genetic structure that was variable through time and between life stages. Outlier locus analyses suggested that targets of spatially divergent selection were mostly temporally variable, though a significant number of spatial outlier loci were shared between life stages. Head shape, a putatively ecologically responsive (adaptive) phenotype inB. cocosensisalso exhibited high temporal variability within sites. However, consistent spatial relationships between sites indicated that environmental similarities among sites may generate predictable phenotype distributions across space. Our study highlights the complex microevolutionary dynamics of marine systems, where consideration of multiple ecological dimensions can reveal both predictable and stochastic patterns in the distributions of genetic and phenotypic variation. Such considerations probably apply to species that possess short, complex life cycles, have large dispersal potential and fecundities, and that inhabit heterogeneous environments.
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