Riverscape genomics of cichlid fishes in the lower Congo: Uncovering mechanisms of diversification in an extreme hydrological regime
Riverscape genomics of cichlid fishes in the lower Congo: Uncovering mechanisms of diversification in an extreme hydrological regime
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刚果下游慈鲷的河流景观基因组学：揭示极端水文状况下的多样化机制
DOI：
10.1111/mec.16495
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发表时间：
2022
影响因子：
4.9
通讯作者：
S. Elizabeth, Alter
中科院分区：
文献类型：
--
作者：
Naoko, P. Kurata;Michael, J. Hickerson;Sandra, L. Hoffberg;Ned, Gardiner;Melanie, L. J.;S. Elizabeth, Alter
考虑到淡水栖息地只占地球表面的一小部分，淡水鱼的多样性是显著的，但产生这种多样性的机制仍然知之甚少。河流提供了很好的模型来理解淡水多样性是如何在异质栖息地中产生和维持的。特别是，刚果河下游（LCR）是一个动态的水景，表现出非凡的水生生物多样性、地方性、形态和生态专门化。先前的研究表明，LCR中大量的高能急流形成了基因流动的物理障碍，从而促进了多样性和物种形成，产生了鱼系多样性。然而，利用分布在LCR上的鱼类的全基因组snp，这一假设尚未得到充分的探索。在这里，我们研究了LCR特有的四种lamprogine慈鲷，它们沿着河流分布，没有范围重叠。利用全基因组SNP数据，我们验证了高能激流作为基因流动的物理屏障，在种间和种内水平上产生遗传差异，并且基因流动主要发生在下游方向的假设。我们的研究结果与预测一致，即强大的激流有时会成为基因流动的障碍，但也表明，在一定的时间和空间尺度上，它们可能为河流流变性慈鲷鱼提供了多向扩散的机会。这些结果突出了河流多样化过程的复杂性，以及在不同河流景观中评估这些过程的重要性。
Freshwater fishes are notably diverse, given that freshwater habitat represents a tiny fraction of the earth's surface, but the mechanisms generating this diversity remain poorly understood. Rivers provide excellent models to understand how freshwater diversity is generated and maintained across heterogeneous habitats. In particular, the lower Congo River (LCR) consists of a dynamic hydroscape exhibiting extraordinary aquatic biodiversity, endemicity, morphological and ecological specialization. Previous studies have suggested that the numerous high‐energy rapids throughout the LCR form physical barriers to gene flow, thus facilitating diversification and speciation, generating ichthyofaunal diversity. However, this hypothesis has not been fully explored using genome‐wide SNPs for fish species distributed across the LCR. Here, we examined four lamprologine cichlids endemic to the LCR that are distributed along the river without range overlap. Using genome‐wide SNP data, we tested the hypotheses that high‐energy rapids serve as physical barriers to gene flow that generate genetic divergence at interspecific and intraspecific levels, and that gene flow occurs primarily in a downstream direction. Our results are consistent with the prediction that powerful rapids sometimes act as a barrier to gene flow but also suggest that, at certain temporal and spatial scales, they may provide multidirectional dispersal opportunities for riverine rheophilic cichlid fishes. These results highlight the complexity of diversification processes in rivers and the importance of assessing such processes across different riverscapes.
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影响因子：
3.4
作者：
Alter SE;Brown B;Stiassny ML
通讯作者：
Stiassny ML
影响因子：
3.3
作者：
Aardema ML;Stiassny MLJ;Alter SE
通讯作者：
Alter SE
影响因子：
2.1
作者：
Burress, E. D.;Alda, F.;Chakrabarty, P.
通讯作者：
Chakrabarty, P.
刚果河流域
DOI：
10.1007/978-94-007-6173-5_92-1
发表时间：
2016
期刊：
Bulletin of the Museum of Comparative Zoology at Harvard College
影响因子：
--
作者：
I. Harrison;R. Brummett;M. Stiassny
通讯作者：
M. Stiassny
河流网络的结构可以驱动水生种群的进化动态
影响因子：
3.3
作者：
Andréa T. Thomaz;Mark R. Christie;L. Knowles
通讯作者：
L. Knowles