Phylogenomics reveals habitat-associated body shape divergence in Oryzias woworae species group (Teleostei: Adrianichthyidae)
Phylogenomics reveals habitat-associated body shape divergence in Oryzias woworae species group (Teleostei: Adrianichthyidae)
复制标题
系统基因组学揭示了 Oryzias woworae 物种组中与栖息地相关的体形差异（Teleostei：Adrianichthyidae）
DOI：
10.1016/j.ympev.2017.10.005
复制
发表时间：
2018
影响因子：
4.1
通讯作者：
Yamahira K
中科院分区：
文献类型：
--
作者：
Mokodongan DF;Montenegro J;Mochida K;Fujimoto S;Ishikawa A;Kakioka R;Yong L;Mulis;Hadiaty RK;Mandagi IF;Masengi WA;Wachi N;Hashiguchi Y;Kitano J;Yamahira K
Oryzias woworaepecies类群由O. asinua、O. wolasi和O. woworae，广泛分布于苏拉威西岛东南部，是印度-澳大利亚群岛的一个岛屿。这三个物种的深细长体型差异是明显的，它被用作一个物种的诊断特征。这些鱼类栖息于不同的栖息地，从上游河流到池塘，这表明三个物种之间的体型差异可能反映了对当地环境的适应。首先，我们的几何形态测量这一物种组的8个当地人群之间的发现，这三个物种不能分开的身体形状和河流的人口有更多的细长机构和较长的尾部比湖泊人口。其次，它们的系统发育关系并不支持三个物种的存在;使用线粒体DNA和从RNA-Seq获得的基因组数据进行的系统发育分析显示，这八个种群不能被分为代表三个描述物种的三个不同分支。第三，系统发育校正的身体形状的变化和祖先状态重建的身体形状表明，河流和湖泊种群之间的身体形状的分歧持续存在，即使被认为是adhergenies和身体形状迅速演变，无论adhergenies。性二型体型也很明显，但二型的程度并没有显着不同的河流和湖泊种群的系统发育校正后，这表明性选择可能不会大大有助于身体形状的地理变异。总的来说，这些结果表明，深细长的身体形状的分歧，O。woworaespecies组在当地进化的栖息地环境，如水流，和一个彻底的分类重新检查theO。woworaecepies组可能是必要的。
TheOryzias woworaespecies group, composed ofO. asinua,O. wolasi, andO. woworae, is widely distributed in southeastern Sulawesi, an island in the Indo-Australian Archipelago. Deep-elongated body shape divergence is evident among these three species to the extent that it is used as a species-diagnostic character. These fishes inhabit a variety of habitats, ranging from upper streams to ponds, suggesting that the body shape divergence among the three species may reflect adaptation to local environments. First, our geometric morphometrics among eight local populations of this species group revealed that the three species cannot be separated by body shape and that riverine populations had more elongated bodies and longer caudal parts than lacustrine populations. Second, their phylogenetic relationships did not support the presence of three species; phylogenies using mitochondrial DNA and genomic data obtained from RNA-Seq revealed that the eight populations could not be sorted into three different clades representing three described species. Third, phylogenetic corrections of body shape variations and ancestral state reconstruction of body shapes demonstrated that body shape divergence between riverine and lacustrine populations persisted even if the phylogenies were considered and that body shape evolved rapidly irrespective of phylogeny. Sexual dimorphism in body shape was also evident, but the degree of dimorphism did not significantly differ between riverine and lacustrine populations after phylogenetic corrections, suggesting that sexual selection may not substantially contribute to geographical variations in body shape. Overall, these results indicate that the deep-elongated body shape divergence of theO. woworaespecies group evolved locally in response to habitat environments, such as water currents, and that a thorough taxonomic reexamination of theO. woworaespecies group may be necessary.