HOME >> BIOLOGY >> NEWS
Popular weed killer disrupts frogs' sexual development

The nation's top-selling weed killer, atrazine, disrupts the sexual development of frogs at concentrations 30 times lower than levels allowed by the Environmental Protection Agency (EPA), raising concerns about heavy use of the herbicide on corn, soybeans and other crops in the Midwest and around the world.

In the April 16 issue of Proceedings of the National Academy of Sciences, developmental endocrinologist Tyrone Hayes and colleagues from the University of California, Berkeley, report that atrazine at levels often found in the environment demasculinizes tadpoles and turns them into hermaphrodites creatures with both male and female sexual characteristics. The herbicide also lowers levels of the male hormone testosterone in sexually mature male frogs by a factor of 10, to levels lower than those in normal female frogs. The research was funded by the National Science Foundation (NSF).

"Researchers are investigating a number of possible causes for declining populations of amphibians, said William Zamer, program director in NSF's division of integrative biology and neuroscience, which funded the research. Hayes and colleagues appear to have identified another potential agent. Their findings indicate that atrazine has significant endocrinological effects on frogs at very low doses."

As Hayes discovered, many atrazine-contaminated ponds in the Midwest contain native leopard frogs with the same abnormalities. Atrazine-exposed frogs don't have normal reproductive systems," he said. "The males have ovaries in their testes and much smaller vocal organs," which are essential in calling potential mates. It is unclear whether these abnormalities lead to reduced fertility. Hayes now is trying to determine how the abnormalities affect the frogs' ability to produce offspring.

"The use of atrazine in the environment is basically an uncontrolled experiment - there seems to be no atrazine-free environment," Ha
'"/>

Contact: Cheryl Dybas
cdybas@nsf.gov
703-292-8070
National Science Foundation
16-Apr-2002


Page: 1 2 3

Related biology news :

1. Popular Science announces Third Annual Brilliant 10
2. Popular Science announces second annual Brilliant 10: the countrys top young scientists
3. Popularizing precision agriculture
4. Popular Science outlines need for long-term studies and more regulation in A.R.T.
5. Popular weed killer feminizes native leopard frogs across Midwest
6. Popular weed killer demasculinizes frogs, disrupts their sexual development
7. Popular pain analgesics found to affect central nervous system: Study identifies both peripheral and CNS mechanisms of action of NSAID use
8. Popular Diet Supplement May Be A Cancer Risk
9. Emu Meat Not A Popular Choice Among Consumers, Study Shows
10. New Studies Shed Light On Facial Features Of Popular Dinosaurs
11. Popular Cure-All Tea Can Cause Toxic Reactions

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:8/21/2020)... Virginia (PRWEB) , ... August 20, 2020 , ... ... today that Hassan Movahhed , a Clinical Operations executive with expertise in ... management, has joined the firm as an Expert Consultant. Throughout his career, Mr. ...
(Date:8/7/2020)... ... 2020 , ... Nine middle school teachers from eight states ... unique professional development program that provides advanced STEM (science, technology, engineering and math) ... , Created in partnership between the National Stem Cell Foundation and The Gatton ...
(Date:7/31/2020)... FRANCISCO (PRWEB) , ... July 30, 2020 , ... ... maturing prescription digital therapeutics product portfolio with a near term focus on Type ... biotech and pharma commercialization experience across multiple therapeutic areas and classes. As Chief ...
Breaking Biology News(10 mins):
(Date:7/31/2020)... ... July 29, 2020 , ... G-CON Manufacturing, the ... new tagline, “BUILDING FOR LIFE.” The adoption of this taglines comes at a ... fast track capacity to provide patients with urgently needed vaccines and other lifesaving ...
(Date:7/31/2020)... ... 29, 2020 , ... The SDX® Respiratory Gating System ... has reached its 20th anniversary of worldwide use. Introduced in the US over ... including University of Pennsylvania, University of Michigan, University of Maryland, University of California ...
(Date:7/18/2020)... Ohio (PRWEB) , ... July 16, 2020 , ... ... data solutions to aid in the early detection and prevention of high-burden diseases, ... to enable US-based hospitals and healthcare organizations to utilize existing data in order ...
(Date:7/10/2020)... ... July 09, 2020 , ... Sentien Biotechnologies, Inc., a ... of Allen R. Nissenson, M.D., F.A.C.P., as its Chief Medical Officer. Dr. ... lead product, SBI-101. Dr. Nissenson serves as an Emeritus Professor of Medicine ...
Breaking Biology Technology:
Cached News: