Abstract
Three species of Elodea, E. canadensis Michx., E. ernstae St John and E. nuttallii St John were contaminated with concentrations of NH 4 + occurring in the environment at 0.25, 0.50 and 1 mg l −1 and also with concentrations, clearly greater than natural values, of 2.5., 5.0 and 7.5 mg l −1. These assays were carried out over a 7 day test period. The effects of ammonium were investigated by measuring the net photosynthesis and residue analyses of the active substance in water were also carried out. Three different significant types of reaction were found: (1) strong concentrations of ammonium nitrogen (1–7.5 mg l −1 of N-NH 4 +) do not affect the photosynthetic activity of E. ernstae; (2) these concentrations stimulate the photosynthesis of E. nuttallii; (3) they inhibit the photosynthesis of E. canadensis.
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