Fenster Charles B
Department of Biology, Barnes Laboratory, The University of Chicago, 5630 S. Ingleside Avenue, Chicago, IL, 60637, USA.
Evolution. 1991 Mar;45(2):410-422. doi: 10.1111/j.1558-5646.1991.tb04414.x.
The role of gene establishment in gene flow was investigated in a population of the annual legume Chamaecrista fasciculata by determining the effect of interparent distance on progeny fitness throughout the entire life history. A decelerating gain in progeny fitness with increasing interparent distance was observed. Selfed progeny suffered a 2-fold fitness disadvantage compared to progeny derived from mating events between individuals in the same neighborhood. Progeny derived from within neighborhood crosses had lower fitness than progeny from crosses between neighborhoods. Coupling the effect of interparent distance on gene establishment with information on gene dispersal resulted in a considerable increase in estimated gene flow. However, gene flow was still limited, as the average neighborhood area corresponded to a circle with radius of approximately 3.0 m. Yearly fluctuations in population size and variation in reproductive output lowered the estimate of N below the census estimate to approximately 100 individuals. The role of a seed bank in increasing the estimate of N was found to be insignificant. It is likely that genetic drift plays a major role in determining the distribution of genetic variation in this population.
通过确定亲本间距离对一年生豆科植物Chamaecrista fasciculata整个生活史中后代适合度的影响，研究了基因建立在基因流中的作用。观察到随着亲本间距离增加，后代适合度的增加呈减速趋势。与来自同一邻域个体间交配产生的后代相比，自交后代的适合度有2倍的劣势。来自邻域内杂交的后代适合度低于来自邻域间杂交的后代。将亲本间距离对基因建立的影响与基因扩散信息相结合，使得估计的基因流显著增加。然而，基因流仍然有限，因为平均邻域面积相当于一个半径约为3.0米的圆。种群大小的年度波动和繁殖输出的变化使N的估计值低于普查估计值，约为100个个体。发现种子库在增加N的估计值方面作用不显著。遗传漂变可能在决定该种群遗传变异分布中起主要作用。
