Abstract
Abstract: The acute toxicity of a glyphosate herbicide Roundup®, contaminating freshwater ecosystems in Sri Lanka was investigated with two species of the most common freshwater crustaceans: calanoid copepod ( Phyllodiaptomus annae Apstein) and decapod shrimp ( Caridina nilotica P. Roux). LC50 values in adult males were determined using standard toxicity assays under static conditions. The 48h LC50 value for P. annae was estimated as 1.06 mg/L and the values of 72 h and 96 h LC50 for C. nilotica were 107.53 and 60.97 mg/L, respectively. The present study reveals that Roundup® may cause a significant impact on native non-target organisms. Further studies are needed to establish the toxic effect of Roundup® to the very important structural group in the aquatic ecosystems in Sri Lanka. Keywords: Acute toxicity, glyphosate, mortality, Roundup®, shrimp, zooplankton. Doi: 10.4038/jnsfsr.v39i2.3178 J.Natn.Sci.Foundation Sri Lanka 2011 39 (2): 169-173
Highlights
Glyphosate is one of the most widely used toxic herbicides in the world
The acute toxicity of a glyphosate herbicide Roundup®, contaminating freshwater ecosystems in Sri Lanka was investigated with two species of the most common freshwater crustaceans: calanoid copepod (Phyllodiaptomus annae Apstein) and decapod shrimp
The percentage mortality of copepods in each concentration group became progressively higher as the concentration of exposure increased, and the mean mortality in all of the five concentration groups exposed to Roundup® was significantly higher than that of the controls
Summary
Glyphosate is one of the most widely used toxic herbicides in the world. According to the most recent data on pesticide usage, glyphosate was the most widely used herbicide in agriculture. Very little research has been carried out on the effects of glyphosate on aquatic micro-organisms or invertebrates (Austin et al, 1991, Alberdi et al, 1996; Neskovic et al, 1996). It is vital that research must be conducted on both the acute and chronic toxic effects of these herbicides on nontarget organisms.
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