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Seed production is examined in three wild populations of the cycad Zamia integrifolia in Florida. Seed size is found to be not, or only weakly, correlated with seed number per cone, indicating that these two variables are nearly independent. As cone size increases, seed number increases but seed size does not. This suggests that seed size is under tight genetic control in individual plants. The division of resources between seed size and seed crop size is likely the result of the interplay between selection for successful seedling establishment and effective seed dispersal.
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