Phylogenetic relationships and natural hybridization in rabbitfishes (Teleostei: Siganidae) inferred from mitochondrial and nuclear DNA analyses
Phylogenetic relationships and natural hybridization in rabbitfishes (Teleostei: Siganidae) inferred from mitochondrial and nuclear DNA analyses
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DOI：
10.1016/j.ympev.2007.04.018
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发表时间：
2007-10-01
影响因子：
4.1
通讯作者：
Nishida, Mutsumi
中科院分区：
文献类型：
--
作者：
Kuriiwa, Kaoru;Hanzawa, Naoto;Nishida, Mutsumi
利用线粒体细胞色素b基因和核ITS1(内转录间隔区1)序列分析，研究了珊瑚礁群落中具有重要生态功能的兔鱼(Siganidae)的系统发育关系。对西太平洋地区已知的22种中的19种的分析表明，Siganidae在遗传上聚为三大支系，具有一些形态和生态特征。在亲缘关系密切的物种之间，如Siganus guttatus-S.Lineatus和S.virgatus-S.Doliatus，以及在珊瑚链霉菌中识别的两个变型之间，发现了小但可辨别的遗传分化，这意味着每一对的成分都是初生种。另一方面，在一些物种之间，如S.fuscescens-S.Canalrulatus和S.unimaculatus-S.vocpinus的每一对组分的个体都构成了一个遗传马赛克，这表明这两个组分分别是单个生物物种内的遗传颜色变种。此外，来自形态特征、线粒体DNA和核DNA的证据给出了几个个体身份和关系的不一致图景。他们被认为是杂交种或具有杂交血统的个体。这种情况不仅出现在亲缘关系密切的物种之间，如牙根尖吻吸虫S.lineatus、维氏粘虫S.virgatus-S。Doiatus和两个变型(初生种)，但也存在于远缘种之间，如S.corallinus S.puellus。事实上，超过一半的被研究物种(11/20，当将珊瑚链霉菌中的两个变种作为独立物种对待时)参与了杂交。这表明，杂交在海水鱼类中的比例比之前假设的要高得多，可能与它们的多样性有一定的相关性。(C)2007 Elsevier Inc.保留所有权利。
Phylogenetic relationships of rabbitfishes (the family Siganidae), ecologically important components as primary consumers in coral reef communities, were studied using mitochondrial cytochrome b gene and nuclear ITS1 (internal transcribed spacer 1) sequence analyses. The analyses of 19 out of 22 species known in the Western Pacific region revealed that siganids are genetically clustered into three major clades, which are characterized by some morphological and ecological traits. Between closely related species, such as Siganus guttatus-S. lineatus and S. virgatus-S. doliatus, and also between two morphs recognized in S. corallinus, small but discernible genetic differentiation was found, implying that the components of each pair are incipient species. On the other hand, between some species, such as S. fuscescens-S. canaliculatus and S. unimaculatus-S.vulpinus, individuals of the components of each pair were found to construct a genetic mosaic, suggesting that the components are genetic color morphs within a single biological species, respectively. Moreover, evidence from morphological characters, mtDNA, and nuclear DNA gave an inconsistent picture of identity and relationships for several individuals. They were regarded as hybrids or individuals with hybrid origin. Such instances were observed not only between closely related species, such as S. guttatus S. lineatus, S. virgatus-S. doliatus, and two morphs (incipient species) in S. corallinus, respectively, but also between distantly related ones, such as S. corallinus S. puellus. In fact, more than half of the species examined (11/20, when treating the two morphs in S. corallinus as independent species) were involved in hybridization. These suggest that hybridization is much more prevalent in marine fishes than previously assumed, and may have some relevance to their diversification. (c) 2007 Elsevier Inc. All rights reserved.