Archives of The Cold Blooded News

The Newsletter of the Colorado Herpetological Society

Volume 32, Number 5;   May, 2005

Roundup Ravages Riparian Residents

PITTSBURGH -- The herbicide Roundup is widely used to eradicate weeds. But a study published today by a University of Pittsburgh researcher finds that the chemical may be eradicating much more than that. University of Pittsburgh assistant professor of biology Rick Relyea found that Roundup, the second most commonly applied herbicide in the United States, is "extremely lethal" to amphibians. This field experiment is one of the most extensive studies on the effects of pesticides on nontarget organisms in a natural setting, and the results may provide a key link to global amphibian declines.

In a paper titled "The Impact of Insecticides and Herbicides on the Biodiversity and Productivity of Aquatic Communities," published in the journal Ecological Applications, Relyea examined how a pond's entire community -- 25 species, including crustaceans, insects, snails, and tadpoles -- responded to the addition of the manufacturers recommended doses of two insecticides -- Sevin (carbaryl) and malathion -- and two herbicides -- Roundup (glyphosate) and 2,4-D.

Relyea found that Roundup caused a 70 percent decline in amphibian biodiversity and an 86 percent decline in the total mass of tadpoles. Leopard Frog tadpoles and Gray Treefrog tadpoles were completely eliminated and Wood Frog tadpoles and toad (Bufo) tadpoles were nearly eliminated. One species of frog, Spring Peepers, was unaffected.

"The most shocking insight coming out of this was that Roundup, something designed to kill plants, was extremely lethal to amphibians," said Relyea, who conducted the research at Pitt's Pymatuning Laboratory of Ecology. "We added Roundup, and the next day we looked in the tanks and there were dead tadpoles all over the bottom." .

Relyea initially conducted the experiment to see whether the Roundup would have an indirect effect on the frogs by killing their food source, the algae. However, he found that Roundup, although an herbicide, actually increased the amount of algae in the pond because it killed most of the frogs. "It's like killing all the cows in a field and seeing that the field has more grass in it -- not because you made the grass grow better, but because you killed everything that eats grass," he said.

Previous research had found that the lethal ingredient in Roundup was not the herbicide itself, glyphosate, but rather the surfactant, or detergent, that allows the herbicide to penetrate the waxy surfaces of plants. In Roundup, that surfactant is a chemical called polyehtoxylated tallowamine. Other herbicides have less dangerous surfactants: For example, Relyea's study found that 2,4-D had no effect on tadpoles. "We've repeated the experiment, so we're confident that this is, in fact, a repeatable result that we see," said Relyea. "It's fair to say that nobody would have guessed Roundup was going to be so lethal to amphibians." (Because news articles are necessarily brief, lots of important details have to be left out. In response to Monsanto's criticisms of the Relyea (2005) study of Roundup's lethal effects on amphibians, there is now a webpage that addresses Monsanto's concerns. http://www.pitt.edu/~relyea/Roundup.html.) A gratis downloadable pdf of the paper by Relyea is available from the CNAH PDF Library on the CNAH web site home page at: http://www.cnah.org/cnah_pdf.asp.