Abstract
Changes are described in the benthic fauna of Lochs Linnhe and Eil in response to organic enrichment of the loch sediments, brought about by the input of effluent material from a pulp and paper mill. Fluctuations in the amount of effluent discharges are related to subsequent successional changes in the fauna. As organic enrichment proceeds, there is progressive elimination of species, accompanied by an increase in the numbers of the surviving species. Excessive organic deposition leading to anoxic conditions at the sediment/water interface results in the elimination of all but a few annelid species. The observed successional changes are discussed in the light of recent hypotheses concerning ecological change in relation to environmental stress.
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