Abstract
Effects of drought and varying plant density on the competitive coexistence of two winter annual Erodium species were studied using multiple regression analysis. Significant indications of resource partitioning were detected for interspecific mixtures under spring drought. Competitive superiority also was environment-dependent with E. botrys dominating with drought in autumn, while E. brachycarpum dominated with drought in spring. The results suggest that competitive coexistence in Erodium is promoted by processes both equilibrial (e.g., resource partitioning) and nonequilibrial (e.g. competitive reversals).
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