Survival of cyanobacteria in rivers following their release in water from large headwater reservoirs

Harmful Algae
Nicholas WilliamsonLee Bowling

Abstract

Cyanobacterial survival following their release in water from major headwaters reservoirs was compared in five New South Wales rivers. Under low flow conditions, cyanobacterial presence disappeared rapidly with distance downstream in the Cudgegong and Hunter Rivers, whereas the other three rivers were contaminated for at least 300 km. Cyanobacterial survival is likely to be impacted by the geomorphology of each river, especially the extent of gravel riffle reaches (cells striking rocks can destroy them) and by the different turbulent flow conditions it produces within each. Flow conditions at gauging stations were used to estimate the turbulent strain rate experienced by suspended cyanobacteria. These indicate average turbulent strain rates in the Cudgegong and Hunter Rivers can be above 33 and 83 s-1 while for the Murray, Edward and Macquarie Rivers average strain rate was estimated to be less than 30 s-1. These turbulent strain rate estimates are substantially above published thresholds of approximately 2 s-1 for impacts indicated from laboratory tests. Estimates of strain rate were correlated with changes in cyanobacterial biovolume at stations along the rivers. These measurements indicate a weak but significant negative lin...Continue Reading

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