SMALL doses of pesticide are enough to hit frogs where it hurts them most—in the immune system. This might explain the mysterious disappearance of amphibians all around the globe.
Researchers have been puzzling over this problem for years. The usual suspects are climate change, pollution or disease.
Pesticides are believed to break down under UV light to form poisons that trigger deformities in amphibians (Â鶹´«Ã½, 13 September 1997, p 18), and weedkillers can turn male frogs into females. But Brian Dixon of the University of Waterloo in Ontario, Canada, believes he has discovered the real reason why…
