Abstract
The effect of various flow patterns on the uptake of 32P by river periphyton was examined in a laboratory flume. In general, water movement increased 32P uptake, except where the phosphorus demand of the microorganisms was presumably satisfied by molecular diffusion at high phosphorus concentrations (105 µg·liter−1 PO4‐P). However, there was little difference in 32P uptake between the several distinct flow regimes produced by increasing or decreasing velocity and turbulence associated with a hump and hydraulic jump. It appears that the threshold limit for water movement, after which no further stimulation occurs, is ⩽5.4 cm·s−1, the lowest velocity tested. A reduction in 32P uptake by formaldehyde‐killed films of periphyton indicated that 50–75% of the uptake of the untreated films was due to biological activity.
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