Genetic differentiation in the circum-Antarctic sea spider Nymphon australe (Pycnogonida: Nymphonidae)
Genetic differentiation in the circum-Antarctic sea spider Nymphon australe (Pycnogonida: Nymphonidae)
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DOI：
10.1016/j.dsr2.2010.05.019
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发表时间：
2011-01-01
影响因子：
3
通讯作者：
Miller, Karen J.
中科院分区：
文献类型：
--
作者：
Arango, Claudia P.;Soler-Membrives, Anna;Miller, Karen J.
Nymphon australe Hodgson 1902是南大洋最丰富的海蜘蛛。该物种被认为是高度形态变化，环极和广深的，这是令人惊讶的，因为海蜘蛛缺乏一个繁殖阶段;受精卵和幼虫仍然附着在父亲的产卵，因此具有有限的传播能力。本研究对N.南极洲周围的australe种群，面临着明显有限的传播能力与其公认的环极。在这里，我们分析了来自南极半岛，威德尔海和东南极洲标本的线粒体DNA，以确定它们是否代表广泛分布的N。或者相反，我们可以识别神秘的物种-以及它们在遗传上的差异。CO 1和16 S序列数据都产生了N.南极洲三个地点都没有神秘物种的迹象。然而，我们发现强大的地理结构之间的三个南极位置的基础上CO 1数据。南极半岛和东南极地区之间只有一个共同的单倍型，并且三个地区之间都有显著的细分（F-ST=0.28，p
Nymphon australe Hodgson 1902 is the most abundant species of sea spiders in the Southern Ocean. The species is recognised as highly morphologically variable, circumpolar and eurybathic-which is surprising given that sea spiders lack a planktonic stage; the fertilised eggs and larvae remain attached to the ovigers of the father, and consequently have limited dispersal capacity. In this study, we investigate the genetic structure of N. australe populations around Antarctica, confronting the apparent limited dispersal ability with its recognised circumpolarity. Here we analyse mitochondrial DNA of specimens from Antarctic Peninsula, Weddell Sea and East Antarctica to determine if they represent populations of the widespread N. australe or instead we can recognise cryptic species - and how genetically different they are. Both CO1 and 16S sequence data produced single haplotype networks for N. australe from all three Antarctic locations without indication of cryptic speciation. However, we found strong phylogeographic structure among the three Antarctic locations based on CO1 data. There was only a single shared haplotype between the Antarctic Peninsula and the East Antarctica locations, and all three regions were significantly subdivided from each other (F-ST=0.28, p