The effects of Roundup® on microbial biota present in the lake were assessed by measuring the number of indigenous mesophilic Aeromonas in presence of different amounts of the herbicide at 0, 50 and 100 mg l−1 of glyphosate. In samples containing 50 and 100 mg l−1 of glyphosate a significant (P < 0.05) increase in Aeromonas spp. counts and accompanying flora was observed.
The acute toxicity of Roundup® and of Roundup® diluted with Albufera lake water to Microtox® luminescent bacterium (Vibrio fischeri) also was determined. The EC50 values obtained were 36.4 mg l−1 and 64.0 mg l−1 of glyphosate respectively. The acidity (pH 4.5) of the herbicide formulation was the responsible of the observed toxicity. 相似文献