Vogler D W, Kalisz S
Department of Biological Sciences, The University of Pittsburgh, Pennsylvania 15260, USA.
Evolution. 2001 Jan;55(1):202-4. doi: 10.1111/j.0014-3820.2001.tb01285.x.
Previous reviews of plant outcrossing rate survey data have agreed that predominant selfing and predominant outcrossing are alternative stable states of mating system evolution. We reanalyzed the most recent data and plot outcrossing rates as a continuous variable rather than as a class variable. Wind-pollinated species are indeed bimodal. However, the shape of the distributions for animal-pollinated species reveals that intermediate rates of outcrossing are common (49% of species fall between 20% and 80% outcrossing). Consequently, we suggest that mating system is best considered a continuous rather than a discrete character of plant populations.
先前对植物异交率调查数据的综述一致认为，主要自交和主要异交是交配系统进化的两种交替稳定状态。我们重新分析了最新数据，并将异交率绘制成连续变量而非分类变量。风媒传粉的物种确实呈现双峰分布。然而，动物传粉物种的分布形状表明，中等异交率很常见（49%的物种异交率在20%至80%之间）。因此，我们认为交配系统最好被视为植物种群的一个连续而非离散特征。
