Source: Mother Jones
By Tom Philpott
Thu Apr. 5, 2012 3:00 AM PDT
Syngenta's atrazine isn't the only widely used herbicide that appears to have bizarre effects on frogs. According to a study (PDF) from University of Pittsburgh ecologist Rick Relyea, Monsanto's flagship weedkiller Roundup—by far the most-used herbicide on the planet—not only has lethal effects on tadpoles at doses found in ponds near farm fields, but it also literally changes their shape in ways that mimic tadpole's reaction to predators.
Importantly, Relyea stresses that what's likely causing the problem isn't Roundup's active ingredient, glyphosate, but rather the surfactant Monsanto uses to penetrate plant tissues so that glyphosate can effectively kill weeds.