Pleistocene colonization of afro-alpine 'sky islands' by the arctic-alpine Arabis alpina

被引:79
作者
Assefa, A.
Ehrich, D.
Taberlet, P.
Nemomissa, S.
Brochmann, C.
机构
[1] Univ Oslo, Natl Ctr Biosystemat, Museum Hist Nat, NO-0318 Oslo, Norway
[2] Univ Addis Ababa, Dept Biol, Addis Ababa, Ethiopia
[3] Univ Grenoble 1, CNRS UMR 5553, Lab Ecol Alpine, F-38026 Grenoble, France
关键词
afro-alpine; phylogeography; East Africa; cpDNA; Arabis alpina; pleistocene; MITOCHONDRIAL-DNA; GENETIC-STRUCTURE; BRASSICACEAE; CHLOROPLAST; PHYLOGEOGRAPHY; HAPLOTYPES; TIMES;
D O I
10.1038/sj.hdy.6800974
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The afro-alpine region comprises the high mountains of Ethiopia and tropical East Africa, which represent biological 'sky islands' with high level of endemism. However, some primarily arctic-alpine plants also occur in the afro-alpine mountains. It has been suggested that these plants are Tertiary relicts, but a recent worldwide study of Arabis alpina suggests that this species colonized the region twice during the Pleistocene. Here we investigate the detailed colonization history of A. alpina in the afro-alpine region based on chloroplast DNA sequences from 11 mountain systems. The results confirm the twice-into-Africa scenario. The Asian lineage is confined to the mountains closest to the Arabian Peninsula, on opposite sides of the Rift Valley (Simen Mts and Gara Muleta in Ethiopia), suggesting long-distance dispersal of this lineage. The African lineage is divided into two phylogeographic groups with distinct geographic distribution. The observed pattern is consistent with isolation of the African lineage in at least two interglacial refugia, located on separated highlands, followed by range expansion in cooler period(s), when the afro-alpine habitat extended further down the mountains. Several long-distance dispersal events, also across the Rift Valley, are suggested by single haplotypes observed outside the area occupied by the phylogeographic groups they belonged to.
引用
收藏
页码:133 / 142
页数:10
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