Abstract
The effects of continuous chlorination (as NaOCl) on estuarine benthic organisms were investigated with plankton-derived experimental communities. Twelve consecutive studies were conducted, each of which consisted of approximately 60-day colonization periods from flowing estuarine waters that continuously received nominal concentrations of 0·00, 0·47, 0·94 or 1·41 mg chlorine-produced oxidant (CPO) l −1 . Significant chlorination effects on numerical abundances of eight dominant species were detected in data pooled over the 12 consecutive studies, although only two species were significantly affected in proportional abundance. There was also a significant decline in total numbers of individuals collected in chlorinated communities. Significant differences in short-term community structures were found in only four of 12 experiments and were related to changes in species dominance and increased toxicity due to extreme cold weather.
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