Date of Original Version
Four components of reproductive yield (the weight of reproductive tissue) were examined in relationt o their effect on reproductive effort and their relative contributions to reproductive yield in five species of goldenrods (Solidago, Compositae). The yield components were number of flowing stems per plant, number of flowering branches per stem, number of flowering heads per branch, and number of seeds per seed head. Individuals within populations increase their reproductive effort by increasing their reproductive weight, not by decreasing their vegetative weight. Each species shows a different pattern of positive correlations of yield components with reproductive yield and reproductive effort, indicating that each species has its own mech-anisms for regulating reproduction. The yield components were not significantly intercorrelated.
Primack, R. B., A. R. Rittenhouse, and P. V. August. 1981. Components of reproductive effort and yield in goldenrods. American Journal of Botany, 68: 855-858. Available at http://www.jstor.org/stable/2443191