Sets of families of the annual herb Impatiens pallida were created by crossing random individuals from a natural population growing in an undisturbed Fagus grandifolia-Acer saccharum forest in Quebec. Replicate samples of these families were then planted into random sites in the same area from which the parents had been collected. Survival, growth and fecundity were scored in two experiments, conducted in similar Fagus-Acer habitats but in different locations and years. Various measures of all three variables were positively correlated with seed size; large seeds sometims gave rise to large and fecund plants but small seeds never did (...)
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Bell et al. (1991) studied this question.