HOME >> BIOLOGY >> NEWS
Popular weed killer feminizes native leopard frogs across Midwest

Berkeley - Native male leopard frogs throughout the nation's Corn Belt are being feminized by an herbicide, atrazine, used extensively to kill weeds on the country's leading export crops, corn and soybeans, according to a survey conducted by University of California, Berkeley, biologists and reported this week in Nature.

The UC Berkeley scientists also showed that male leopard frogs raised in laboratory tanks contaminated with atrazine develop egg cells in their testes and essentially turn into hermaphrodites. These sexual abnormalities were observed at atrazine levels as low as 0.1 parts per billion (ppb), 30 times lower than the current allowable limit for atrazine in drinking water set by the Environmental Protection Agency.

These findings, added to earlier evidence that atrazine demasculinizes two other species of frog, suggest that the herbicide could be a factor in the decline of frogs and other amphibians in the United States and around the world, the authors say. Atrazine has been used on crops since 1956 and currently is the most widely used herbicide in the nation.

"These studies clearly indicate that atrazine is detrimental to amphibians," said study author Tyrone Hayes, associate professor of integrative biology at UC Berkeley.

At the least, he said, atrazine is altering amphibian populations in large areas of the United States. His field studies show that frogs seem to adapt, since leopard frogs (Rana pipiens) - the most common frogs in the Midwest - are often abundant in some of the corn growing areas region where atrazine is used most. Atrazine may feminize male tadpoles and turn them into female frogs, he said, or it may render some males infertile. Alternatively, atrazine may favor tadpoles that delay sexual differentiation until after they've turned into frogs and leave the contaminated water.

"Atrazine is potentially destroying biodiversity," said Hayes, now engaged in studies to determine the ultimate fate
'"/>

Contact: Robert Sanders
rls@pa.urel.berkeley.edu
510-643-6998
University of California - Berkeley
30-Oct-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 disrupts frogs sexual development
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:11/12/2019)... (PRWEB) , ... November 12, 2019 , ... ... Cross-Channel Spend Optimizer that improves digital advertising performance up to 25% and reduces ... Advertising, Cross-Channel Spend Optimizer uses advanced multi-touch attribution (MTA) to predict best advertising ...
(Date:11/9/2019)... ... November 08, 2019 , ... SiteSeer Technologies, creator of ... as a new client and user of SiteSeer. The boutique real estate developer of ... U.S. will use SiteSeer to supplement its own analysis of markets. , Geoffrey ...
(Date:11/6/2019)... ... November 06, 2019 , ... In October, Massachusetts stem cell ... patients about a poorly disclosed deficiency in stem cell treatments. Throughout stem ... the treating stem cells. This problem affects all patients receiving stem cell ...
Breaking Biology News(10 mins):
(Date:11/19/2019)... ... November 19, 2019 , ... Supercomputing Conference ... learning infrastructure solutions for Autonomous Vehicle , Medical Imaging, and Natural Language ... systems with the Graphcore Poplar® software stack as part of its bare-metal cloud ...
(Date:11/12/2019)... ... November 12, 2019 , ... Genedata, ... that Immatics Biotechnologies , a clinical-stage biopharmaceutical company developing T-cell receptor ... R&D operations related to the discovery and development of high-affinity and high-specificity ...
(Date:11/12/2019)... Va. (PRWEB) , ... November 12, 2019 , ... ... forensic DNA services, welcomed their new Director of Forensic Genealogy, Melinde Lutz Byrne, ... Genealogy Service (FGS) to ultimately provide investigative leads to law enforcement through ...
(Date:11/9/2019)... ... November 08, 2019 , ... ... for use in pathology research, today announced the results of analyses examining ... enrolled in the phase 3 selonsertib studies (STELLAR). Strong correlations were demonstrated ...
Breaking Biology Technology:
Cached News: