- As Monsanto's Roundup Ready GM crops encourage an ever
increasing application of the herbicide, and amphibians continue to decline
worldwide...
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- "The most striking result from the experiments was
that a chemical designed to kill plants killed 98 percent of all tadpoles
within three weeks and 79 percent of all frogs within one day"
- -- University of Pittsburgh researcher, Rick Relyea
-
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- Roundup(r) Kills Frogs As Well As Tadpoles,
Pitt Biologist Finds
- Product is lethal even at lower concentrations;
soil does not lessen its effects
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- University of Pittsburgh
- 8-3-5
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- As amphibians continue to mysteriously disappear worldwide,
a University of Pittsburgh researcher may have found more pieces of the
puzzle. Elaborating on his previous research, Pitt assistant professor
of biological sciences Rick Relyea has discovered that Roundup(r), the
most commonly used herbicide in the world, is deadly to tadpoles at lower
concentrations than previously tested; that the presence of soil does not
mitigate the chemical's effects; and that the product kills frogs in addition
to tadpoles.
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- In two articles published in the August 1 issue of the
journal Ecological Applications, Relyea and his doctoral students Nancy
Schoeppner and Jason Hoverman found that even when applied at concentrations
that are one-third of the maximum concentrations expected in nature, Roundup(r)
still killed up to 71 percent of tadpoles raised in outdoor tanks.
-
- Relyea also examined whether adding soil to the tanks
would absorb the Roundup(r) and make it less deadly to tadpoles. The soil
made no difference: After exposure to the maximum concentration expected
in nature, nearly all of the tadpoles from three species died.
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- Although Roundup(r) is not approved for use in water,
scientists have found that the herbicide can wind up in small wetlands
where tadpoles live due to inadvertent spraying during the application
of Roundup(r).
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- Studying how Roundup(r) affected frogs after metamorphosis,
Relyea found that the recommended application of Roundup(r) Weed and Grass
Killer, a formulation marketed to homeowners and gardeners, killed up to
86 percent of terrestrial frogs after only one day.
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- "The most striking result from the experiments was
that a chemical designed to kill plants killed 98 percent of all tadpoles
within three weeks and 79 percent of all frogs within one day," Relyea
wrote.
-
- Previous studies have determined that it is Roundup(r)'s
surfactant (polyethoxylated tallowamine, or POEA, an "inert"
ingredient added to make the herbicide penetrate plant leaves) and not
the active herbicide (glyphosate) that is lethal to amphibians.
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- This research was funded by the National Science Foundation,
Pitt's McKinley Fund, and the Pennsylvania Academy of Science.
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- http://www.umc.pitt.edu:591/m/FMPro?-db=ma&
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