HOME >> BIOLOGY >> NEWS
Popular weed killer demasculinizes frogs, disrupts their sexual development

Berkeley - 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 an article in the April 16 issue of Proceedings of the National Academy of Sciences, University of California, Berkeley, developmental endocrinologist Tyrone B. Hayes, associate professor of integrative biology, and his colleagues 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.

As Hayes later 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," Hayes said. "Because it is so widespread, aquatic environments are at risk."

Because the herbicide has been in use for 40 years in some 80 countries, its effect on sexual development in male frogs could be one of many factors in the global decline of amphibians, he added.

The findings come at a time when the EPA is re-evaluating allowable levels of atrazine in drinking water, which stand today at 3 parts
'"/>

Contact: Robert Sanders
rls@pa.urel.berkeley.edu
510-643-6998
University of California - Berkeley
15-Apr-2002


Page: 1 2 3 4 5

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 disrupts frogs 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:2/3/2016)... India , February 3, 2016 ... the new market research report "Automated Fingerprint Identification System ... Search, Latent Search), Application (Banking & Finance, Government, Healthcare, ... published by MarketsandMarkets, the market is expected to be ... CAGR of 21.0% between 2015 and 2020. The transformation ...
(Date:2/2/2016)... 2016 Checkpoint Inhibitors for Cancer – ... Are you interested in the future of cancer ... inhibitors. Visiongain,s report gives those predictions to 2026 ... level. Avoid falling behind in data or ... revenues those emerging cancer therapies can achieve. There ...
(Date:2/1/2016)... -- Today, the first day of American Heart Month, the ... first of its kind workplace health solution that leverages ... first application of Watson to ... Welltok will create a new offering that combines AHA,s ... on Welltok,s health optimization platform. The effort is intended ...
Breaking Biology News(10 mins):
(Date:2/6/2016)... McLean, VA (PRWEB) , ... February 06, 2016 , ... ... enrichment session, cost-free, for middle and high school teachers on Wednesday February 10, 2016. ... be held at the Smithsonian-Mason School of Conservation, located at 1500 Remount Road in ...
(Date:2/5/2016)... 2016  In the pharmaceutical industry the medical affairs ... launch activities including the identification and engagement of key ... especially high in the oncology therapeutic area where most ... the Role of Medical Affairs in Oncology Launch Excellence ... therapies find better ways to utilize medical affairs to ...
(Date:2/5/2016)... 2016 Australian-US drug discovery and development company, Novogen ... of a new Chairman, Mr John O,Connor , and ... James Garner , has also been formally ... Acting CEO, Mr Iain Ross , will resume his ... James Garner , has also been formally appointed to ...
(Date:2/4/2016)... Feb. 4, 2016  Sangamo BioSciences, Inc. (NASDAQ: ... today that Edward Lanphier , Sangamo,s president and ... progress of Sangamo,s ZFP Therapeutic ® development programs ... 2:40 pm ET on Thursday, February 11, 2016, at ... Conference. The conference is being held in ...
Breaking Biology Technology:
Cached News: