![]() These changes were accompanied by a decrease in underwater light intensity, which consequently inhibited the photosynthetic intensity of phytoplankton. However, flow rate significantly enhanced the inter-relationships among environmental variables, in particular by inducing higher water turbidity and vegetative reproduction of periphyton ( Spirogyra). ![]() ![]() These findings indicate that critical flow rate can be useful in developing methods to reduce algal bloom occurrence. Changes in flow conditions affected algal competition for light, resulting in a dramatic shift in phytoplankton composition, from blue-green algae in still waters to green algae in flowing conditions. A critical flow rate occurred near 0.06 m/s, which was the lowest relative inhibitory rate. The lower biomass in all flowing enclosures showed that flow rate significantly inhibited the growth of phytoplankton. We monitored nutrients, temperature, dissolved oxygen, pH, conductivity, turbidity, chlorophyll- a and phytoplankton levels. To investigate the effects of flow rate on phytoplankton dynamics and related environment variables, a set of enclosure experiments with different flow rates were conducted in an artificial lake.
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