Multiple late-Pleistocene colonisation events of the Antarctic pearlwort Colobanthus quitensis (Caryophyllaceae) reveal the recent arrival of native Antarctic vascular flora
Multiple late-Pleistocene colonisation events of the Antarctic pearlwort Colobanthus quitensis (Caryophyllaceae) reveal the recent arrival of native Antarctic vascular flora
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DOI：
10.1111/jbi.13843
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发表时间：
2020-04-19
影响因子：
3.9
通讯作者：
Convey, Peter
中科院分区：
文献类型：
--
作者：
Biersma, Elisabeth M.;Torres-Diaz, Cristian;Convey, Peter
目标 南极洲偏远且极端的陆地环境中仅栖息着两种本土维管束植物。我们评估了其中一种物种 Colobanthus quitnsis 的南极和南美洲种群之间的遗传连通性，以确定其在南极洲的起源和年龄。位置 南美洲亚南极岛屿海上南极洲。南极珍珠草 Colobanthus quitnsis（石竹科）的分类单元。方法 对来自纬度横断面的 270 个样本进行了 4 个叶绿体标记和 1 个核标记的测序。南纬21-68度。利用系统发育、种群遗传和分子测年分析来评估C. quitnsis的种群历史和该物种在南极洲的年龄。结果海洋南极种群由两个不同的单倍型簇组成，占据海洋南极北部和南部。分子测年分析表明 C. quitensis 是一个年轻的（
Aim Antarctica's remote and extreme terrestrial environments are inhabited by only two species of native vascular plants. We assessed genetic connectivity amongst Antarctic and South American populations of one of these species, Colobanthus quitensis, to determine its origin and age in Antarctica.Location Maritime Antarctic, sub-Antarctic islands, South America.Taxon Antarctic pearlwort Colobanthus quitensis (Caryophyllaceae).Methods Four chloroplast markers and one nuclear marker were sequenced from 270 samples from a latitudinal transect spanning 21-68 degrees S. Phylogeographic, population genetic and molecular dating analyses were used to assess the demographic history of C. quitensis and the age of the species in Antarctica.Results Maritime Antarctic populations consisted of two different haplotype clusters, occupying the northern and southern Maritime Antarctic. Molecular dating analyses suggested C. quitensis to be a young (