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Citation. Tilman, D. 1987. Further thoughts on competition for essential resources. Theoretical Population Biology 32(3):442-446. [1165 LTER]
Introduction. Abrams (1987) notes several differences between his approach to resource competition and that of Tilman (1982). The theory presented by Abrams (1987) is more complex than that in Tilman (1982) because Abrams explicitly linked optimal foraging and resource competition (at least for a simple model), whereas I used optimal foraging to derive the qualitative form of consumption vectors and resource-dependent growth isoclines and then used these isoclines and consumption vectors to predict the outcome of competition. Despite these differences, the two approaches make qualitatively similar predictions. I used a simplified, graphical approach to resource competition because I wished to explore the broad implications of resource type and resource competition for the diversity, species composition, and successional dynamics of plant and animal communities. I have not been able to find any ways in which the more explicit theory developed by Abrams (1987) qualitatively changes any of the relationships between resource competition and community structure that were proposed in Tilman (1982). However, Abrams' paper raises several points that merit further discussion.