Phylogenomics of pike cichlids (Cichlidae: Crenicichla): the rapid ecological speciation of an incipient species flock
Phylogenomics of pike cichlids (Cichlidae: Crenicichla): the rapid ecological speciation of an incipient species flock
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DOI：
10.1111/jeb.13196
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发表时间：
2018-01-01
影响因子：
2.1
通讯作者：
Chakrabarty, P.
中科院分区：
文献类型：
--
作者：
Burress, E. D.;Alda, F.;Chakrabarty, P.
独立的湖泊生活群体慈鲷的表型和生态多样性的迅速增加是东非五大湖的象征。在这项研究中，我们表明，类似的生态基础上的多样化发生在派克慈鲷（Crenicichla）在整个乌拉圭河流域的南美洲。我们收集了近500个超保守元件（UCEs）基因座和超过260000个碱基对在33个物种的基因组数据，以获得一个系统发育假说的主要物种组，并评估五个密切相关的，特有的，共同发生的物种（乌拉圭河物种群; URSF）之间的关系和遗传结构。此外，我们评估了生态分歧的URSF的基础上，身体和下咽颚（LPJ）的形状和肠道内容物。在整个属中，我们恢复了物种群体之间的新关系。我们发现强烈支持的单系的URSF，然而，这些物种之间的关系仍然存在问题，可能是因为这个分支的快速和最近的进化。经过遗传共祖分析，恢复了大多数物种以及划定的遗传群体。URSF物种表现出物种特异性的身体和LPJ形状与专门的营养作用。总的来说，我们的研究结果表明，URSF由初期物种，通过生态物种形成与探索新的营养作用。
The rapid rise of phenotypic and ecological diversity in independent lake-dwelling groups of cichlids is emblematic of the East African Great Lakes. In this study, we show that similar ecologically based diversification has occurred in pike cichlids (Crenicichla) throughout the Uruguay River drainage of South America. We collected genomic data from nearly 500 ultraconserved element (UCEs) loci and >260000 base pairs across 33 species, to obtain a phylogenetic hypothesis for the major species groups and to evaluate the relationships and genetic structure among five closely related, endemic, co-occurring species (the Uruguay River species flock; URSF). Additionally, we evaluated ecological divergence of the URSF based on body and lower pharyngeal jaw (LPJ) shape and gut contents. Across the genus, we recovered novel relationships among the species groups. We found strong support for the monophyly of the URSF; however, relationships among these species remain problematic, likely because of the rapid and recent evolution of this clade. Clustered co-ancestry analysis recovered most species as well delimited genetic groups. The URSF species exhibit species-specific body and LPJ shapes associated with specialized trophic roles. Collectively, our results suggest that the URSF consists of incipient species that arose via ecological speciation associated with the exploration of novel trophic roles.