Abstract
Structure of biological communities forming on test panels established at stations progressively removed from a pulp mill outfall indicated simplification, as measured by a number of indices relating to species diversity, and was associated with water transparency as well as other physical factors relating to effluent discharge. A dynamic interaction between influence of dark coloured mill effluent in reducing phytoplanktonic production at the head of Alberni Inlet and the influence of oceanic, species rich, water drawn in through the inlet mouth by way of a sub‐surface counter current was postulated. This paper consists of two parts of which this, the first, deals specifically with effects of pulp mill effluent on subtidal communities, and the second with effects on intertidal communities.
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