Seed Predation and Dormancy in the Population Dynamics of Avena Fatua and A. Barbata

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Abstract
Estimates of seed loss due to animal predation in Avena fatua and A. barbata over a number of sites in the California annual—type grasslands varied from 0% to 65% of the total seed load. Avena species showed complex patterns of variation in germination both between and within populations. Counts of seedling deaths due to precocious germination in nature suggest that the observed variation in germination provides insurance against seedling losses due to somewhat erratic fall rains. These factors are significant in regulation of Avena populations.

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