Abstract
SUMMARY (1) Models of competition in divided or heterogeneous environments are reviewed. (2) A model of competition in a divided environment is presented. The competition coefficients, a, are reduced by a term, 0, which measures the amount of overlap between species. (3) Actual values of 0 are presented for two Drosophila communities. (4) 0 depends on the degree of aggregation of the competing species and on their densities. The outcome of competition in a divided environment must, then, be density dependent. (5) Low values of 0 improve the stability of a multi-species community and allow more
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