Navigation Links
Roundup®highly lethal to amphibians, finds University of Pittsburgh researcher

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.

Pitt 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 tree frog tadpoles were completely eliminated and wood frog tadpoles and toad 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 k illed 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 polyethoxylated 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."


'"/>

Source:University of Pittsburgh Medical Center


Related biology news :

1. Gene-specific Ebola therapies protect non-human primates from lethal disease
2. Genetic network guards against lethal DNA damage
3. Researchers discover key mechanism by which lethal viruses Ebola and Marburg cause disease
4. Study uncovers a lethal secret of 1918 influenza virus
5. Anthrax paralyzes immune cells with lethal toxin, UF research shows
6. Peramivir protects mice from lethal H5N1 infection
7. Current human embryonic stem cell lines contaminated UCSD/Salk team finds
8. Study finds more than one-third of human genome regulated by RNA
9. ASU researchers finds novel chemistry at work to provide parrots vibrant red colors
10. Same mutation aided evolution in many fish species, Stanford study finds
11. NC State scientist finds soft tissue in T. rex bones
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:2/8/2017)...  Aware, Inc. (NASDAQ: AWRE ), a leading ... for its quarter and year ended December 31, 2016. ... $3.9 million compared to $6.9 million in the same quarter ... was $0.6 million compared to $2.6 million in the fourth ... 2016 was $0.5 million, or $0.02 per diluted share, which ...
(Date:2/7/2017)... 2017 Zimmer Biomet Holdings, Inc. (NYSE and ... present at the LEERINK Partners 6th Annual Global Healthcare ... Wednesday, February 15, 2017 at 10 a.m. Eastern Time. ... can be accessed at http://wsw.com/webcast/leerink28/zbh .  The webcast ... Zimmer Biomet,s Investor Relations website at http://investor.zimmerbiomet.com . ...
(Date:2/2/2017)...   TapImmune, Inc. (NASDAQ: ... the development of innovative peptide and gene-based immunotherapeutics ... metastatic disease, announced today it has successfully completed ... second clinical lot of TPIV 200, the company,s ... manufactured vaccine product will be used to supply ...
Breaking Biology News(10 mins):
(Date:2/24/2017)...  VWR Corporation (NASDAQ: VWR), the leading global independent provider ... today reported its financial results for the fourth quarter and ... 4Q16 record quarterly net sales of $1.13 ... basis. 4Q16 EMEA-APAC segment net ... the Americas net sales increased 2.5%, or down 0.9% on ...
(Date:2/23/2017)... ... February 23, 2017 , ... BellBrook ... portfolio to include an array of biochemical analyses critical for Lead Discovery. ... their hit-to-lead and SAR programs, including inhibitor potency and selectivity, mechanism of action, ...
(Date:2/23/2017)... , Feb. 23, 2017  Seattle,s upscale Capitol Hill ... a strange place for a head lice treatment salon to ... between a Tuscan restaurant and a French bistro on E ... perfect. "We aren,t just any old lice clinic, we pride ... feel comfortable, and release some of the stigma associated with ...
(Date:2/23/2017)... ... February 23, 2017 , ... David ... Inventors Recognition Reception at Purdue Research Park of West Lafayette, Indiana. ... recognition of outstanding contributions to, and success with, commercializing discoveries from Purdue research. ...
Breaking Biology Technology: