Assessments of spatial and temporal congruency across taxa from genetic data provide insights into the extent to which similar processes structure communities. However, for coastal regions that are affected continuously by cyclical sea-level changes over the Pleistocene, congruent interspecific response will not only depend upon codistributions, but also on similar dispersal histories among taxa. Here, we use SNPs to test for concordant genetic structure among four codistributed taxa of freshwater fishes (Teleostei: Characidae) along the Brazilian Atlantic coastal drainages. Based on population relationships and hierarchical genetic structure analyses, we identify all taxa share the same geographic structure suggesting the fish utilized common passages in the past to move between river basins. In contrast to this strong spatial concordance, model-based estimates of divergence times indicate that despite common routes for dispersal, these passages were traversed by each of the taxa at different times resulting in varying degrees of genetic differentiation across barriers with most divergences dating to the Upper Pleistocene, even when accounting for divergence with gene flow. Interestingly, when this temporal dissonance is viewed through the lens of the species-specific ecologies, it suggests that an ecological sieve influenced whether species dispersed readily, with an ecological generalist showing the highest propensity for historical dispersal among the isolated rivers of the Brazilian coast (i.e., the most recent divergence times and frequent gene flow estimated for barriers). We discuss how our findings, and in particular what the temporal dissonance, despite common geographic passages, suggest about past dispersal structuring coastal communities as a function of ecological and paleo-landscape sieves.

中文翻译：

---

共同的障碍，但短暂的不和谐：基因组测试表明，生态和古地形筛构成了沿海的沿河鱼类群落。

通过遗传数据对整个分类单元的时空一致性进行评估，可以洞悉相似过程在多大程度上构成群落。但是，对于受更新世周期性海平面变化持续影响的沿海地区，同种间的种间反应不仅取决于共分布，而且还取决于分类群之间的相似分布历史。在这里，我们使用SNPs来检验巴西大西洋沿岸排水带的四种淡水鱼类（Teleostei：Characidae）的共分布生物群之间的一致遗传结构。基于种群关系和层次遗传结构分析，我们确定所有分类单元都具有相同的地理结构，这表明该鱼类过去利用共同的通道在流域之间移动。与这种强烈的空间一致性相反，基于模型的发散时间估计表明，尽管有常见的扩散途径，但每个分类单元在不同时间穿越了这些通道，导致跨障碍的遗传分化程度不同，即使是考虑到发散，大多数发散可以追溯到上更新世。基因流。有趣的是，当从物种特定生态学的角度看待这种时间上的不和谐时，这表明生态筛网会影响物种是否容易分散，而生态通才对巴西沿岸孤立河域的历史扩散倾向最高（（例如，最近的发散时间和估计的障碍基因频率。我们讨论了我们的发现如何，尤其是时间上的不和谐，