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Harvesting and Limiting Similarity

It is shown that harvesting (which can also be thought of as predation without switching or as an effect of certain environmental degradations) of a (sub)community, which consists of several competitors partitioning some resource in a randomly fluctuating environment, causes a decrease in limiting similarity, hence a decrease in the number of species which can coexist. Computer simulations which elucidate the dynamical behavior in such a situation are briefly described. Finally, an attempt is made to summarize the various possibilities for diversity changes due to harvesting or predation, and some difficulties in interpreting the relevant field data are discussed.