High levels of population structure caused by habitat islands in the malarial vector Anopheles scanloni
High levels of population structure caused by habitat islands in the malarial vector Anopheles scanloni
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DOI：
10.1038/sj.hdy.6800959
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发表时间：
2007-07-01
期刊：
影响因子：
3.8
通讯作者：
Walton, C.
中科院分区：
文献类型：
--
作者：
O'Loughlin, S. M.;Somboon, P.;Walton, C.
使用线粒体 DNA 序列研究了泰国疟疾媒介斯坎洛尼按蚊的四个种群的遗传结构。观察到四个高度分化的谱系，所有谱系都带有种群扩张的信号。自从安.斯坎洛尼仅限于石灰岩喀斯特栖息地的“岛屿”，这表明该物种存在混合种群动态，基因流动受限、灭绝和漂移都导致了谱系分歧。历史环境变化和海洋侵入也可能导致人口灭绝、扩张和分化。尽管目前推断附近种群之间存在一些基因流，但北部和南部种群之间的基因流受到极大限制，而且 ITS2 rDNA 基因座上的一个固定多态性也存在差异。杂交实验表明，北方和南方之间不存在交配后障碍，但这些种群之间缺乏基因流动最终可能导致物种形成，并对疟疾控制策略产生影响。
The genetic structure of four populations of the malarial vector Anopheles scanloni in Thailand was studied using mitochondrial DNA sequences. Four highly divergent lineages were observed, all with signals of population expansion. Since An. scanloni is restricted to 'islands' of limestone karst habitat, this suggests there is a metapopulation-type dynamic in this species, with restricted gene flow, extinctions and drift all contributing to lineage divergence. Historical environmental change and marine transgressions may also have contributed to population extinction, expansion and divergence. Although there is some current gene flow inferred between nearby populations, it is extremely restricted between the northern and southern populations, which also differed by one fixed polymorphism at the ITS2 rDNA locus. Crossing experiments showed no post-mating barriers existing between the north and the south, but the lack of gene flow between these populations could ultimately result in speciation and has implications for malaria control strategies.