CO 2 Enrichment and Dependence of Reproduction on Density in an Annual Plant and a Simulation of its Population Dynamics

1. Populations of an annual plant, Abutilon theophrasti, were grown at four densities (100, 500, 1500 and 4000 m −2 ) and two CO 2 concentrations (350 and 700 μl l −1 ) to examine the influence of CO 2 environment on density-dependent patterns of demography and reproduction. Variables measured included survivorship, proportion of plants flowering and fruiting, number of fruiting individuals, number of seeds per individual, total seed production per population, mean seed mass, and germination of seeds produced in each environment