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:
(Date:4/22/2014)... Gables, Fla. (April 21, 2014) -- There are all ... their feathers and spread their colorful tails; satin bowbirds ... with blue and shiny objects; and European bitterling males ... species has evolved a unique method to communicate with ... "Signaling can have profound fitness implications ...
(Date:4/22/2014)... 2014 Scientists from the Florida campus of The ... that plays a critical but previously unknown role in ... showed a novel role for a protein known as ... eLife , a publisher supported by the Howard ... Wellcome Trust. , "This is a critical building block ...
(Date:4/22/2014)... International Science Consortium Ltd.,s nanotechnology expert will present a ... hazard assessment" at the 7th International Nanotoxicology Congress ... Turkey. , Dr. Monita Sharma will outline a ... National Academy of Sciences, " Toxicity Testing in the ... recommends use of non-animal methods involving human cells and ...
Breaking Biology News(10 mins):Best practices in communication for the animal world 2Best practices in communication for the animal world 3Scientists identify critical new protein complex involved in learning and memory 2
(Date:1/15/2014)... 2014  Bill Jacobs Automotive, a group of car dealerships headquartered ... the Heartland Blood Center and offering free oil change coupons ... place Saturday, Jan. 18 at the Bill Jacobs Cadillac and ... (Photo: http://photos.prnewswire.com/prnh/20140115/MN46637 )  The Bill Jacobs ...
(Date:1/15/2014)... Westlake Village, Calif. (PRWEB) January 15, 2014 ... cancer treatment and management through the genomic analysis of ... will offer Therapy Finder™, a web-based cancer decision support ... a reporting option with Cynvenio’s ClearID™ genomic test, Therapy ...
(Date:1/15/2014)... A study has been launched to test whether technology ... help to tackle the problem of obesity.  This unique healthcare ... based in Stowmarket) and academics at University Campus Suffolk is ... which is inspired by equipment used to collect data about ...
(Date:1/15/2014)... (PRWEB) January 15, 2014 DTS Language ... its Online Web Portal for Life Science organizations who need ... specify the subject matter of their documents in advance with ... help reduce time-to-delivery of translations, often a critical factor in ...
Breaking Biology Technology:Join the Bill Jacobs Auto blood drive and receive a free oil change 2Cynvenio Offers New Breast Cancer Therapy Finder Application for its ClearID Breast Cancer Genomic Test 2Cynvenio Offers New Breast Cancer Therapy Finder Application for its ClearID Breast Cancer Genomic Test 3Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 2Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 3Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 4DTS Improves Efficiency for Life Science Document Translations 2
Cached News: