Abstract
Major advances in community ecology could be made in the remainder of this decade by developing a strongly comparative approach. Some suggestions for emphasis include the following five questions: (1) What are the relative importances of the following types of interactions between organisms in natural systems: competition, predation, parasitism, mutualism, amensalism, commensalism, and neutralism? Does relative importance differ in different kinds of organisms like bacteria, protozoa, annual and perennial plants, invertebrates, vertebrates, generalists, and specialists? (2) What are the organizing factors in communities? How do they differ between communities of different kinds of organisms? (3) How do members of the same food web interact directly and indirectly, particularly between trophic levels? (4) What roles do microorganisms play in natural systems, and what are their relative importances? (5) To what extent does the understanding of natural phenotypic and genotypic variation within and between populations contribute to our understanding of ecological systems?
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