Schmidt Kurt P, Levin Donald A
Department of Botany, University of Texas at Austin, Austin, TX, 78712.
Evolution. 1985 Mar;39(2):396-404. doi: 10.1111/j.1558-5646.1985.tb05676.x.
Comparative demography of reciprocally sown populations for all stages of the life cycle of the winter annual, Phlox drummondii, was recorded for two seasons in natural sites. The sites investigated covered the natural range of the species and were separated by linear distances ranging from 10 to over 500 kilometers. Interpopulational variation was observed in all stages of the life cycle. Prereproductive survivorship ranged from 0 to 92 percent. Fecundity per plant ranged from 0 to 81 seeds. Finite rates of increase ranged from 0 to 34.1 yr . The experimental populations with low values were growing in sites that received little rainfall or had experienced an insect or fungal infestation. The populations with high growth rates occurred in the northern sites which received greater rainfall. The relative fitness of individuals from the alien populations was compared to the local populations for all stages of the life cycle. The alien relative fitness for survivorship averaged 0.72. The average relative fitness of aliens for fecundity was 0.71 and that for finite rate of increase was 0.57. The life history parameters found in Phlox populations differ from one part of the range to another so that aliens have lower relative fitnesses than individuals indigenous to the site.
在自然环境中，对冬季一年生植物福禄考生命周期各阶段相互播种种群的比较种群统计学进行了两个季节的记录。所调查的地点涵盖了该物种的自然分布范围，直线距离相隔10至500多公里。在生命周期的所有阶段都观察到了种群间的差异。繁殖前的存活率从0到92%不等。单株繁殖力从0到81粒种子不等。有限增长率从0到34.1年不等。数值较低的实验种群生长在降雨量少或遭受昆虫或真菌侵害的地点。生长率高的种群出现在降雨量较大的北部地区。将外来种群个体在生命周期各阶段的相对适合度与当地种群进行了比较。外来种群在存活率方面的平均相对适合度为0.72。外来种群在繁殖力方面的平均相对适合度为0.71，在有限增长率方面的平均相对适合度为0.57。福禄考种群中发现的生活史参数在分布范围的不同区域有所不同，因此外来种群的相对适合度低于当地的个体。
