Abstract
Effects of the triazine herbicides simazine and terbutryn on total biovolume and community structure of haptobenthic periphytic algal communities within in situ marsh enclosures are described. Levels of biovolume inhibition in excess of 98% relative to an untreated control were observed at all levels of terbutryn tested (0.01, 0.1 and 1.0 mg l−1). No reduction in total biovolume was observed at 0.1 mg l−1 simazine, with increasing inhibition (to 98%) at 1.0 and 5.0 mg l−1. Following incidental enclosure flooding and removal of herbicide, increases in biovolume were observed in all but the highest treatment levels, with rates of colonization similar to that of the control.
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