Variations in biomass and maximal biomasses observed are reviewed. Trophic conditions are considered to be the main factor affecting both nonpredatory and predatory benthos abundance. Competition and predation by invertebrates seem to adjust the abundance of nonpredatory benthos to trophic conditions; both of these processes are influenced by fish. Examples of the role of benthos in ecosystems are reviewed.
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Z. Kajak (1988) studied this question.
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