Cobb M, Huet M, Lachaise D, Veuille M
Laboratoire d'Ecologie, CNRS UMR 7625 et Ecole Pratique des Hautes Etudes, Université Paris-6, Bât. A case 237, 7 Quai St Bernard, 75005 Paris, France.
Mol Ecol. 2000 Oct;9(10):1591-7. doi: 10.1046/j.1365-294x.2000.01064.x.
Microsatellite variation from eight loci was studied in five populations of Drosophila teissieri, a fruit-fly found only in the rain forests of sub-Saharan Africa. Five noncontiguous rain forest sites (from Tanzania, Gabon and Ivory Coast) were sampled to measure the effects of historical forest fragmentation on population structure in an obligatory forest-dwelling species. The Ivory Coast and Gabon populations showed a wider range of alleles, different modal alleles and had a higher genetic diversity than the three East African populations. As could be expected, genetic differentiation (FST) was significantly correlated with physical distance, but the westernmost population (Ivory Coast) showed values that were intermediate between the central (Gabon) and Eastern (Tanzania) populations. A migration-drift equilibrium in a stable continuum of populations did not appear adequate to describe the observed distribution. It seems probable that the species has undergone abrupt changes involving isolation, merging and migration of populations, as a consequence of repeated waves of forest fragmentation and coalescence.
对仅在撒哈拉以南非洲雨林中发现的果蝇——泰氏果蝇的五个种群，研究了来自八个位点的微卫星变异。选取了五个不相邻的雨林地点（来自坦桑尼亚、加蓬和象牙海岸）进行采样，以测量历史森林碎片化对一种 obligatory 森林栖息物种的种群结构的影响。与三个东非种群相比，象牙海岸和加蓬的种群表现出更广泛的等位基因、不同的模态等位基因，并且具有更高的遗传多样性。不出所料，遗传分化（FST）与地理距离显著相关，但最西部的种群（象牙海岸）显示出的值介于中部（加蓬）和东部（坦桑尼亚）种群之间。在稳定的连续种群中，迁移 - 漂变平衡似乎不足以描述观察到的分布。由于森林碎片化和合并的反复浪潮，该物种似乎很可能经历了涉及种群隔离、合并和迁移的突然变化。
