Navigation Links
Pesticide atrazine can turn male frogs into females
Date:3/1/2010

Atrazine, one of the world's most widely used pesticides, wreaks havoc with the sex lives of adult male frogs, emasculating three-quarters of them and turning one in 10 into females, according to a new study by University of California, Berkeley, biologists.

The 75 percent that are chemically castrated are essentially "dead" because of their inability to reproduce in the wild, reports UC Berkeley's Tyrone B. Hayes, professor of integrative biology.

"These male frogs are missing testosterone and all the things that testosterone controls, including sperm. So their fertility is as low as 10 percent in some cases, and that is only if we isolate those animals and pair them with females," he said. "In an environment where they are competing with unexposed animals, they have zero chance of reproducing."

The 10 percent or more that turn from males into females ‑ something not known to occur under natural conditions in amphibians ‑ can successfully mate with male frogs but, because they are genetically male, all their offspring are male.

"When we grow these guys up, depending on the family, we will get anywhere from 10 to 50 percent females," Hayes said. "In a population, the genetically male females can decrease or wipe out a population just because they skew sex ratios so badly."

Though the experiments were performed on a common laboratory frog, the African clawed frog (Xenopus laevis), field studies indicate that atrazine, a potent endocrine disruptor, similarly affects frogs in the wild, and could possibly be one of the causes of amphibian declines around the globe, Hayes said.

Hayes and his UC Berkeley colleagues report their results in this week's online early edition of the journal Proceedings of the National Academy of Sciences. Last week, Hayes and colleagues published a review of pesticide's effects on amphibians in the Journal of Experimental Biology, concluding that a
'/>"/>

Contact: Robert Sanders
rsanders@berkeley.edu
510-643-6998
University of California - Berkeley
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Storm runoff and sewage treatment outflow contaminated with household pesticides
2. A deadly scorpion provides a safe pesticide
3. Even at sublethal levels, pesticides may slow the recovery of wild salmon populations
4. Getting plants to rid themselves of pesticide residues
5. Pesticides -- easier detection of pollution and impact in rivers
6. Pitt research suggests EPA pesticide exposure test too short, overlooks long term effects
7. Natural seed treatment could drastically cut pesticide use
8. Parasite-resistant peppers green alternatives to chemical pesticides
9. Pitt research finds that low concentrations of pesticides can become toxic mixture
10. Pesticide concentrations decreasing
11. Pesticide build-up could lead to poor honey bee health
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... researchers from The Chinese University of Hong Kong, BGI ... soybean linked to salt tolerance, with implication for improving ... study published online in Nature Communications provides ... crop improvement. , Soybean is an important crop for ... soybeans have less genetic diversities than their wild counterparts. ...
(Date:7/11/2014)... Researchers have pioneered a revolutionary new way to ... Virtual Finger, allows scientists to move through digital ... using the flat surface of their computer screens. ... orders of magnitude more efficient, saving time, money ... areas of experimental biology. The software and its ...
(Date:7/11/2014)... cannabinoid receptor type 1 can inhibit voltage-gated ... reduce neurotransmitter release. However, some scholars demonstrated ... extracellular Ca2+ influx and increase neurotransmitter release. ... Hospital Affiliated to Tongji Medical College, Huazhong ... whole cell voltage-clamp and calcium imaging in ...
Breaking Biology News(10 mins):BGI reports a novel gene for salt tolerance found in wild soybean 2Virtual finger enables scientists to navigate and analyze complex 3D images 2
... for benefiting degenerative diseases, and do so by invoking ... manner compatible with clinical use (i.e., without animal feeder ... were a few of a number of conclusions arrived ... Snyder, M.D., Ph.D., and spearheaded by a member of ...
... ability to discern one sex from another may depend ... nerve cells, and the number of receptors is controlled ... Illinois at Chicago researchers have found. , Everything from ... illnesses such as amyotrophic lateral sclerosis, muscular dystrophy, post-traumatic ...
... the first large-scale study to evaluate a candidate HIV ... study collaborators in the United States and South Africa. ... five sites throughout South Africa and is expected to ... of the HIV Vaccine Trials Network (HVTN), which is ...
Cached Biology News:Stem cells act through multiple mechanisms to benefit mice with neurodegenerative disease 2Stem cells act through multiple mechanisms to benefit mice with neurodegenerative disease 3Stem cells act through multiple mechanisms to benefit mice with neurodegenerative disease 4Stem cells act through multiple mechanisms to benefit mice with neurodegenerative disease 5Bisexual fruit flies show new role for neurochemical 2Africa's first large-scale HIV vaccine study launches 2Africa's first large-scale HIV vaccine study launches 3Africa's first large-scale HIV vaccine study launches 4
(Date:7/10/2014)... Robert Harman, DVM, Founder and CEO of Vet-Stem, ... announce the relaunch of his highly informative blog, now named ... “ What are Stem Cells ?” Dr. Harman’s purpose ... in the basics of stem cell therapy so that pet ... of treatment when considering regenerative medicine. , A veterinarian by ...
(Date:7/10/2014)... PETERSBURG, Russia , July 10, 2014 ... Russian Federation Dmitry Medvedev , presented ... biopharmaceutical company BIOCAD . The Company is developing ... scope of MabNext project BIOCAD develops a number of ... cancer and autoimmune diseases. The ceremony took place at ...
(Date:7/10/2014)... 2014 -- According to the International Atomic Energy ... comes from terrorists acquiring sufficient quantities of plutonium ... crude nuclear explosive device. The IAEA also notes ... involved gram-level quantities, which can be challenging to ... a new study appearing this week in the ...
(Date:7/10/2014)... researchers have observed the fractional quantum Hall effect in ... matter can be tuned by an electric field. ... when electrons confined to thin sheets are exposed to ... behavior where thousands of individual electrons behave as a ... effect is well established, many details of this collective ...
Breaking Biology Technology:Robert Harman, DVM Talks About What Stem Cells are in His Latest Blog Series for Vet-Stem, Inc. 2Robert Harman, DVM Talks About What Stem Cells are in His Latest Blog Series for Vet-Stem, Inc. 3Dmitry Medvedev Presented BIOCAD the First National "Industry" Award 2Sensitive detection method may help impede illicit nuclear trafficking 2Columbia researchers observe tunable quantum behavior in bilayer graphene 2Columbia researchers observe tunable quantum behavior in bilayer graphene 3
... North ... America, DEERFIELD, Ill., ... Cartago, Costa Rica has been,recognized with the 2008 Shingo Prize for Operational ... North America,-- is being honored for its achievements in driving higher quality ...
... announced today it,submitted to the U.S. Food & ... Application (BLA) for motavizumab, an investigational,monoclonal antibody (MAb) ... supported by clinical trial data from more than ... of serious disease,caused by respiratory syncytial virus (RSV) ...
... Unique and Innovative Formulation Available Without a ... Prescription ... today announced the,launch of PSORENT, a clinically proven, steroid-free, ... which has,proven efficacy against psoriasis symptoms, in a novel, ...
Cached Biology Technology:Baxter's Costa Rica Facility Recognized With Shingo Prize for Excellence in Manufacturing 2MedImmune Submits Biologics License Application to FDA for Motavizumab 2MedImmune Submits Biologics License Application to FDA for Motavizumab 3NeoStrata(R) Announces the Launch of PSORENT(TM) Psoriasis Topical Treatment 2