SEED‐EATERS VERSUS SEED SIZE, NUMBER, TOXICITY AND DISPERSAL

"Many legumes contain poisonous principles, particularly alkaloids and glucosides, and we should expect Bruchids to be affected by some of these." With this statement, Bridwell (l918) anticipated the subject of this discussion: what traits of seeds may be the result of selective pressure by insects and other seed-eaters? In this discussion of the escape of the offspring of a large sessile organism from predators and parasites, Leguminosae (the bean family) and the bruchid beetles that attack their seeds are used as an empirical example. In a subsequent paper (Janzen, 1968b), a model of seed dispersal is developed as background for discussion of the relevance of seed dispersal and mortality to the density and presence of a species of plant in a community. I intend the data presented here to support the arguments advanced by Stebbins (1967) and Harper ( 1967) against the

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