Department of Genetics, University of California, Davis, California 95616.
Proc Natl Acad Sci U S A. 1981 Feb;78(2):1303-5. doi: 10.1073/pnas.78.2.1303.
Density-dependent genetic evolution was tested in experimental populations of Drosophila melanogaster subject for eight generations to natural selection under high (K-selection) or low (r-selection) population density regimes. The test consisted of determining at high and at low densities the per capita rate of population growth of the selected populations. At high densities, the K-selected populations showed a higher per capita rate of population growth than did r-selected populations, but the reverse was true at low densities. These results corroborate the predictions derived from formal models of density-dependent selection. However, no evidence of a trade-off in per capita rate of growth was observed in 25 populations of D. melanogaster, each homozygous for a different second chromosome sampled from a natural population.
在经历了八代针对高(K-选择)或低(r-选择)种群密度条件下的自然选择的实验种群中,检测了密度依赖的遗传进化。该测试包括在高和低种群密度下确定被选择种群的个体种群增长率。在高种群密度下,K-选择种群的个体种群增长率高于 r-选择种群,但在低种群密度下则相反。这些结果证实了来自密度依赖选择的正式模型的预测。然而,在 25 个 D. melanogaster 种群中,每个种群都从自然种群中同态的第二染色体上采样,没有观察到个体种群增长率的权衡。