April 2012
| Frog on lily pad. Photo by Macomorphosis on Flickr |
Environmental pollutants have exacted a
very heavy toll on amphibians (frogs, toads etc.) around the globe.
A particular offender has been
identified as glyphosate, a weed-killer now widely and repeatedly
sprayed on crops genetically transformed to withstand it.
Frogs are particularly vulnerable to
chemicals because of their life-cycle and physiology. Tadpoles and
spawn are unprotected and live immersed in pooled water along with
whatever contaminants have collected there. Adult frogs have skin
which serves as a 'lung', and doesn't have the tough, impermeable
qualities of, for example, mammalian skin.
A recent study by Argentinean
scientists on the effects of glyphosate on two species of frog
yielded some ominous results.
