INRA, UMR 1210 Biologie et Gestion des Adventices, Dijon, France.
New Phytol. 2010 Mar;185(4):1100-7. doi: 10.1111/j.1469-8137.2009.03129.x. Epub 2009 Dec 18.
*An improved inference of the evolutionary history of invasive species may be achieved by analyzing the genetic variation and population differentiation of recently established populations and their ancestral (historical) populations. Employing this approach, we investigated the role of gene flow in the post-invasion evolution of common ragweed (Ambrosia artemisiifolia). *Using eight microsatellite loci, we compared genetic diversity and structure among nine pairs of historical and recent populations in France. Historical populations were reconstructed from herbarium specimens dated from the late 19th to early 20th century, whereas recent populations were collected within the last 5 yr. *Recent populations showed greater allelic and genetic diversity than did historical populations. Recent populations exhibited a lower level of population differentiation, shorter genetic distances among populations and more weakly structured populations than did historical populations. *Our results suggest that currently invasive populations have arisen from active gene flow and the subsequent admixture of historical populations, incorporating new alleles from multiple introductions.
通过分析新近建立的种群及其祖先（历史）种群的遗传变异和种群分化，可能会对入侵物种的进化历史做出更准确的推断。采用这种方法，我们研究了基因流在豚草（Ambrosia artemisiifolia）入侵后的进化中的作用。利用 8 个微卫星标记，我们比较了法国 9 对历史种群和近期种群之间的遗传多样性和结构。历史种群是根据 19 世纪末至 20 世纪初的植物标本重建的，而近期种群是在过去 5 年内采集的。近期种群的等位基因和遗传多样性大于历史种群。近期种群的种群分化程度较低，种群间的遗传距离较短，种群结构较弱，与历史种群相比。我们的研究结果表明，目前入侵的种群是由活跃的基因流和随后的历史种群混合产生的，从而将多个引入的新等位基因纳入其中。
