Abstract
Mature larvae and nymphs of 9 species of aquatic insects (dragonflies, stoneflies, caddisflies, and mayfly) were tested in the laboratory at pH values from 1.0 to 7.0. The TL 50 values (pH at which 50 per cent of the organisms died) at 30 days ranged from pH 2.45 ( Brachycentrus americanus) to pH 5.38 ( Ephemerella subvaria). The range at which 50 per cent of the insects emerged was pH 4.0–5.9. The 9 species tested were all more sensitive to low pH during the period of emergence.
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