Analysis of the toxicity of glyphosate and Faena® using the freshwater invertebrates Daphnia magna and Lecane quadridentata

With the present contribution an evaluation of the toxicity of the pure herbicide glyphosate and its commercial formulation Faena® is reported using the cladoceran Daphnia magna Strauss and the rotifer Lecane quadridentata Ehrenberg. LC50, EC50, NOEC, and LOEC values for each toxicant and for both test organisms are obtained. Regarding acute toxicity, Faena was 11-fold more toxic to L. quadridentata than pure glyphosate and slightly more toxic to D. magna (1.7-fold). Inhibition of esterase activity in L. quadridentata by glyphosate was the most sensitive end-point; the EC50 was 1500-fold smaller than the LC50. The implications of these results and their comparison with established international and national limit values for glyphosate are discussed. © 2008 Taylor %26 Francis.

Enzyme inhibition; Glyphosate; Herbicide; Toxicity testing Enzyme activity; Enzyme inhibition; Toxicity; Acute toxicity; Glyphosate; Invertebrates; Toxicity testing; Herbicides; enzyme activity; freshwater environment; glyphosate; inhibition; invertebrate; sensitivity analysis; toxicity test; Daphnia; Daphnia magna; Invertebrata; Lecane quadridentata; Rotifera

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