Phylogeographic analysis of the genus Platycephalus along the coastline of the northwestern Pacific inferred by mitochondrial DNA
Phylogeographic analysis of the genus Platycephalus along the coastline of the northwestern Pacific inferred by mitochondrial DNA
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DOI：
10.1186/s12862-019-1477-1
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发表时间：
2019-07-31
影响因子：
3.4
通讯作者：
Gao, Tianxiang
中科院分区：
文献类型：
--
作者：
Cheng, Jie;Wang, Zhiyang;Gao, Tianxiang
研究背景扁头鱼属（Platycephalus）鱼类是重要的经济底层鱼类，广泛分布于热带和温带大陆架沃茨中。该属有着悠久的分类修订历史，最近在西北太平洋（NWP）的四个扁头属物种（Platycephalus sp. 1，Platycephalus sp. 2，P. indicus和P. cultellatus）已被确认和重新描述。然而，许多方面的系统学和进化history.ResultsA共411个人进行了抽样，从22个不同的网站，他们的分布在NWP。对三个线粒体基因座进行了测序，以阐明鱼类的进化史和地理历史。结果表明：4种鸭嘴兽属物种分化明显，其中与鸭嘴兽属物种1和鸭嘴兽属物种2亲缘关系最近，与印度鸭嘴兽属物种2聚在一起，而与印度鸭嘴兽属物种2的亲缘关系最远。在系统发育上，存在明显的分支，与印度马蹄莲相对应，而与其它鸭首属的系统发育不相对应。我们进一步研究了沿着中国和日本海岸线的16个扁头鱼属1种群的地理分布格局。共获得69个单倍型，其中23个在居群间共有。1种群中存在一个优势单倍型群，其谱系结构适中，单倍型多样性和核苷酸多样性水平较低。人口历史重建表明，Platycephalus sp.1种群扩张事件可以追溯到晚更新世。结论分布范围的变化可能是塑造属Platycephalus的遗传关系的关键因素。生殖学校教育和潜在的卵/幼虫传播能力，加上洋流的影响，是负责目前的地理格局的Platycephalus。
BackgroundFlathead fishes of the genus Platycephalus are economically important demersal fishes that widely inhabit the continental shelves of tropical and temperate sea waters. This genus has a long history of taxonomic revision, and recently four Platycephalus species (Platycephalus sp. 1, Platycephalus sp. 2, P. indicus, and P. cultellatus) in the northwestern Pacific Ocean (NWP) have been recognized and redescribed. However, many aspects of their systematics and evolutionary history are unclear.ResultsA total of 411 individuals were sampled from 22 different sites across their distributions in the NWP. Three mitochondrial loci were sequenced to clarify the phylogeny and phylogeographic history of the fishes. The results showed significant differentiation of four Platycephalus species in the NWP with well-supported clades in which Platycephalus sp. 1 and Platycephalus sp. 2 were the closest, clustered with P. cultellatus, while their genetic relationship with P. indicus was the furthest. There were significant genealogical branches corresponding to P. indicus but not to other Platycephalus lineages. We further examined the phylogeographic patterns of 16 Platycephalus sp. 1 populations along the coastlines of China and Japan. A total of 69 haplotypes were obtained, with 23 shared among populations. One dominant haplotypic group, with a modest lineage structure and low levels of haplotype diversity and nucleotide diversity, was observed among Platycephalus sp. 1 populations. The demographic history reconstruction suggested a Platycephalus sp. 1 population expansion event dating back to the late Pleistocene.ConclusionsDistributional rang variations may be the crucial factors shaping the genetic relationships of the genus Platycephalus. Reproductive schooling and potential egg/larval dispersal ability, coupled with the effects of ocean currents, are responsible for the present phylogeographic pattern of Platycephalus sp. 1.