AquaCOV, Centro Oceanográfico de Vigo, Instituto Español de Oceanografía, 36390, Vigo, Spain.
Laboratorio de Recursos Genéticos Marinos, Facultad de Biología, CIM-Universidad de Vigo, 36310, Vigo, Spain.
Sci Rep. 2021 Mar 15;11(1):5929. doi: 10.1038/s41598-021-85008-9.
Hakes of the genus Merluccius include 11 valid species as well a number of rare morphotypes suspected to be "cryptic species". Concatenated nucDNA ITS1-rDNA and mtDNA cyt b sequences plus nested ITS1Nes sequences allowed to ascribe 14 specimens of nine rare morphotypes from the South Pacific and the South Atlantic to the phylogenetic backbone of this genus. Bayesian analyses pointed to M. bilinearis and M. albidus as the oldest species of the genus and the New World cluster, respectively. The phylogenetic status of M. angustimanus from the upper Gulf of California suggests its hybrid origin between M. gayi and M. productus from about 0.25 MYA, although an ever since confinement of a subset of those species cannot be ruled out. The molecular phylodiagnostic test suggests a common origin of all rare morphotypes and the absence of cryptic hake species in the Southern Cone. The molecular background of the morphotypes distributed between the Western Pacific South of New Zealand and the western Atlantic South of Argentina is compatible with their hybrid origin between M. gayi and both, M. australis or M. hubbsi, respectively.
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黑线鳕属（Merluccius）包括 11 个有效种，以及一些疑似“隐种”的罕见形态型。通过串联核 DNA ITS1-rDNA 和 mtDNA cyt b 序列，加上嵌套 ITS1Nes 序列，我们能够将来自南太平洋和南大西洋的 14 个罕见形态型的 9 个标本归入该属的系统发育主干。贝叶斯分析表明，双线黑线鳕（M. bilinearis）和白身黑线鳕（M. albidus）分别是该属最古老的物种和新大陆集群。来自加利福尼亚湾上游的黑线鳕 angustimanus 的系统发育地位表明，它可能是大约 0.25 百万年前由 M. gayi 和 M. productus 杂交产生的，尽管不能排除这些物种的一部分自那时起就被隔离的可能性。分子种系发生诊断测试表明，所有罕见形态型都有共同的起源，而且在南锥体地区没有隐黑线鳕物种。分布在新西兰南部的西太平洋和阿根廷南部的西大西洋之间的形态型的分子背景与它们在 M. gayi 和 M. australis 或 M. hubbsi 之间的杂交起源是一致的。
