The Antarctic Circumpolar Current isolates and connects: Structured circumpolarity in the sea star Glabraster antarctica.
The Antarctic Circumpolar Current isolates and connects: Structured circumpolarity in the sea star Glabraster antarctica.
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DOI：
10.1002/ece3.4551
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发表时间：
2018-11
影响因子：
2.6
通讯作者：
Wilson NG
中科院分区：
文献类型：
--
作者：
Moore JM;Carvajal JI;Rouse GW;Wilson NG
南极绕极流（ACC）通过在南极大陆周围运送幼虫将底栖动物种群联系起来，但也隔离了南极辐合带南北的动物群。我们测试环极panmixia和分散在南极会聚障碍的海底星星Glabrasteranapartica。南大洋和南大西洋，包括麦哲伦地区、斯科舍弧、南极半岛、罗斯海和东南极洲的全面采样。测定了285株细胞色素c氧化酶亚基I（COI）基因和33株内转录间隔区2（ITS 2）基因的序列。我们计算了每个遗传标记的单倍型网络，并使用COI数据的ΦST估计了群体连接性和遗传结构的地理分布。 Glabraster anaustica是一个单一的环南极物种，在遥远的地方之间存在基因流动的情况。尽管ACC具有潜在的遗传多样性，但种群结构较高（ΦST = 0.5236），并且一些亚群在遗传上是孤立的。与先前的研究相比，麦哲伦地区的遗传突变与南极辐合不一致。东南极地区的连接模式并不统一，有些地区与世隔绝，有些地区与遥远的麦哲伦和斯科舍弧地区有着惊人的联系。尽管基因流跨越了非常远的距离，但在地理上邻近的地区之间存在着明显的地理结构和遗传障碍（例如，沙格岩和南格鲁吉亚）。环极panmixia被拒绝，虽然一些亚群显示出一个环极分布。踏脚石分散发生在斯科舍弧，但似乎并没有促进整个南极收敛的连接。南极洲的遗传连接模式很复杂，在南极洲保护区规划中应加以考虑。
The Antarctic Circumpolar Current (ACC) connects benthic populations by transporting larvae around the continent, but also isolates faunas north and south of the Antarctic Convergence. We test circumpolar panmixia and dispersal across the Antarctic Convergence barrier in the benthic sea star Glabraster antarctica. The Southern Ocean and south Atlantic Ocean, with comprehensive sampling including the Magellanic region, Scotia Arc, Antarctic Peninsula, Ross Sea, and East Antarctica. The cytochrome c oxidase subunit I (COI) gene (n = 285) and the internal transcribed spacer region 2 (ITS2; n = 33) were sequenced. We calculated haplotype networks for each genetic marker and estimated population connectivity and the geographic distribution of genetic structure using ΦST for COI data. Glabraster antarctica is a single circum‐Antarctic species with instances of gene flow between distant locations. Despite the homogenizing potential of the ACC, population structure is high (ΦST = 0.5236), and some subpopulations are genetically isolated. Genetic breaks in the Magellanic region do not align with the Antarctic Convergence, in contrast with prior studies. Connectivity patterns in East Antarctic sites are not uniform, with some regional isolation and some surprising affinities to the distant Magellanic and Scotia Arc regions. Despite gene flow over extraordinary distances, there is strong phylogeographic structuring and genetic barriers evident between geographically proximate regions (e.g., Shag Rocks and South Georgia). Circumpolar panmixia is rejected, although some subpopulations show a circumpolar distribution. Stepping‐stone dispersal occurs within the Scotia Arc but does not appear to facilitate connectivity across the Antarctic Convergence. The patterns of genetic connectivity in Antarctica are complex and should be considered in protected area planning for Antarctica.
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DOI：
10.1098/rsbl.2003.0025
发表时间：
2003-08-07
影响因子：
4.7
作者：
Hebert, PDN;Ratnasingham, S;deWaard, JR
通讯作者：
deWaard, JR
影响因子：
4.9
作者：
Baird, Helena P.;Miller, Karen J.;Stark, Jonathan S.
通讯作者：
Stark, Jonathan S.
影响因子：
2.4
作者：
Allcock, AL;Brierley, AS;Rodhouse, PG
通讯作者：
Rodhouse, PG
影响因子：
4
作者：
Anderson, JB;Shipp, SS;Mosola, AB
通讯作者：
Mosola, AB
影响因子：
4.9
作者：
Clement, M;Posada, D;Crandall, KA
通讯作者：
Crandall, KA