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NATURE | Frogs: The Thin Green Line | Chemical Runoff | P...

Duration: 06:36

www.pbs.org/wnet/nature/episod...

Tyrone Hayes and his students from the University of California at Berkeley are studying how agricultural chemicals, including fertilizers and pesticides, are affecting the health of frogs. Pesticides in runoff can cause an increase in stress hormones and lead to immunosuppression in frogs. In some cases Hayes has found that the presence of atrazine, a common agricultural chemical, can even cause frogs that are genetically male to develop as females and produce eggs.

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Post Date: April 3, 2009