Machon Nathalie, Bardin Philippe, Mazer Susan J, Moret Jacques, Godelle Bernard, Austerlitz Frederic
Conservatoire Botanique National du Bassin Parisien, Muséum National d'Histoire Naturelle, 61 rue Buffon, F-75005 PARIS, France.
Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California 93106, USA.
New Phytol. 2003 Mar;157(3):677-687. doi: 10.1046/j.1469-8137.2003.00694.x.
• We studied how the genetic structure helps in understanding the demographic history of a species and predicting its future, using the endangered orchid Spiranthes spiralis. • A Parisian population was mapped during three consecutive years. Its genetic structure was assessed using isozymes and compared with several populations from southern France. Seed dispersal distances were experimentally evaluated. Computer simulations were performed to reconstruct the population history. • Unlike southern France populations, the Parisian population exhibited two genetically distinct patches. Seed dispersal was limited to the neighbourhood of the fruiting plants. The simulations showed that the best explanation for the observed genetic structure was a recent colonization event by two small groups of founders. • Current patterns of gene flow should result in a rapid genetic and demographic homogenization. New populations of S. spiralis could be successfully established by few founders and exhibit significant growth rates without any detrimental effects of inbreeding. This offers insight into the successful management of endangered plant species in urban areas.
• 我们以濒危兰花绶草为研究对象，探究了遗传结构如何有助于理解一个物种的种群历史并预测其未来。
• 连续三年对巴黎的一个种群进行了测绘。利用同工酶评估其遗传结构，并与法国南部的几个种群进行比较。通过实验评估了种子传播距离。进行了计算机模拟以重建种群历史。
• 与法国南部的种群不同，巴黎的种群呈现出两个基因上不同的斑块。种子传播仅限于结果实植株的附近区域。模拟结果表明，对观察到的遗传结构的最佳解释是最近由两组小群体的奠基者进行的殖民事件。
• 当前的基因流动模式应会导致快速的遗传和种群同质化。绶草的新种群可以由少数奠基者成功建立，并呈现出显著的增长率，且没有任何近亲繁殖的有害影响。这为城市地区濒危植物物种的成功管理提供了见解。
