Global phylogeography of Oithona similis s.l. (Crustacea, Copepoda, Oithonidae) - A cosmopolitan plankton species or a complex of cryptic lineages?
Global phylogeography of Oithona similis s.l. (Crustacea, Copepoda, Oithonidae) - A cosmopolitan plankton species or a complex of cryptic lineages?
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DOI：
10.1016/j.ympev.2016.12.019
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发表时间：
2017-02-01
影响因子：
4.1
通讯作者：
Held, Christoph
中科院分区：
文献类型：
--
作者：
Cornils, Astrid;Wend-Heckmann, Britta;Held, Christoph
传统上，许多小型桡足类物种被认为是广布的、两极的或世界性的。然而，鉴于越来越多的证据表明远洋桡足类中存在隐蔽和假隐蔽的物种，这些大规模的分布模式需要重新审视。在这里，我们提出了一个系统地理研究的Oithona similis s.l。人口来自北冰洋、南大洋及其北部边界、北大西洋和地中海。相似野生稻O.similis s.l.被认为是温带至极地海洋中最丰富的物种之一，是微生物环路和较高营养水平(如鱼苗)之间的营养网络中的重要纽带。分析了两个基因片段：线粒体细胞色素氧化酶C亚基I(CoI)和核糖体28 S遗传标记。可识别出7个不同的、地理上划定的线粒体谱系，各谱系之间的差异从8%到24%不等，因此代表了相似亚种中最有可能的隐形或假隐形物种。在南大洋边界之内或附近确定了四个谱系，北冰洋一个谱系，温带北半球两个谱系。令人惊讶的是，北极的血统与南半球的血统的亲缘关系比与北半球的其他血统的亲缘关系更密切，这表明地理上的接近不能很好地预测支系在基因水平上的亲缘关系。(C)2016 Elsevier Inc.保留所有权利。
Traditionally, many small-sized copepod species are considered to be widespread, bipolar or cosmopolitan. However, these large-scale distribution patterns need to be re-examined in view of increasing evidence of cryptic and pseudo-cryptic speciation in pelagic copepods. Here, we present a phylogeographic study of Oithona similis s.l. populations from the Arctic Ocean, the Southern Ocean and its northern boundaries, the North Atlantic and the Mediterrranean Sea. O. similis s.l. is considered as one of the most abundant species in temperate to polar oceans and acts as an important link in the trophic network between the microbial loop and higher trophic levels such as fish larvae. Two gene fragments were analysed: the mitochondria] cytochrome oxidase c subunit I (COI), and the nuclear ribosomal 28 S genetic marker. Seven distinct, geographically delimitated, mitochondria] lineages could be identified, with divergences among the lineages ranging from 8 to 24%, thus representing most likely cryptic or pseudocryptic species within O. similis s.l. Four lineages were identified within or close to the borders of the Southern Ocean, one lineage in the Arctic Ocean and two lineages in the temperate Northern hemisphere. Surprisingly the Arctic lineage was more closely related to lineages from the Southern hemisphere than to the other lineages from the Northern hemisphere, suggesting that geographic proximity is a rather poor predictor of how closely related the clades are on a genetic level. (C) 2016 Elsevier Inc. All rights reserved.