HOME >> BIOLOGY >> NEWS
Salamanders suffer delayed effects of common herbicide

Pollution from a common herbicide might be causing die-offs in stream salamanders, according to biologists who say findings from their long-term study raise concerns over the role of atrazine in global amphibian declines.

The results also suggest that while impacts of the herbicide, atrazine, may not show up in short-term studies, even extremely low concentrations of the chemical may be deadly to amphibians in the long run.

"We are concerned that most studies used to make pesticide registration decisions and to derive safe concentrations last for about four days," said Jason R. Rohr, research associate at the Penn State Institutes of Energy and the Environment. "They often do not consider recovery processes, persistent effects of chemical exposure, or interactions among individuals within and between species that can affect our estimates of safe chemical concentrations."

Atrazine is one of the most widely used pesticides in the United States, and possibly the world. It is relatively long-lived and is even found at the poles. According to the U.S Environmental Protection Agency, it is one of the most common contaminants in ground and surface water.

Rohr and his colleagues Timothy M. Sesterhenn, doctoral candidate, Brent D. Palmer, associate professor, and Tyler Sager, doctoral candidate, all at the University of Kentucky, Lexington, exposed streamside salamander larvae to either 4, 40, or 400 parts per billion of atrazine until metamorphosis, the stage where the water-dwelling salamanders lose their gills and develop lungs that enable them to breathe in air. Scientists then tracked their survival to near reproductive age.

Results from the study, which lasted about 500 days, indicated that the two highest concentrations increased salamander mortality during exposure. However, this mortality benefited the survivors who experienced lower competition-related mortality after metamorphosis.

Nevertheless, this recovery from at
'"/>

Contact: Amitabh Avasthi
axa47@psu.edu
814-865-9481
Penn State
23-Mar-2007


Page: 1 2 3

Related biology news :

1. Better sleep may put Huntingtons disease sufferers back on track
2. Male or female factor infertility -- men suffer just the same
3. New treatment increases life time expectancy of patients suffering from advanced liver cancer
4. Coarse particulate matter in air may harm hearts of asthma sufferers, UNC study finds
5. Vaccine hope for sufferers of potentially fatal stomach bug
6. Swell gel could bring relief to back pain sufferers
7. How fish species suffer as a result of warmer waters
8. Wolves are suffering less from inbreeding than expected
9. Hope remains for Alzheimers sufferers
10. New biologic treatment for tennis elbow may replace surgery for chronic sufferers
11. Children of allergy sufferers prone to same problem

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


(Date:12/14/2019)... JOSE, Calif. (PRWEB) , ... December 12, 2019 ... ... sustainable agrochemical products that protect or enhance crop yields, has appointed Jean Pougnier ... strategic partners and establish relationships with go-to-market partners and influencers that will position ...
(Date:12/2/2019)... ... December 01, 2019 , ... Each year The Scientist ... hit the life-science landscape. For more than a decade, our expert panels of ... facilitating biological discovery. This year’s crop of entries to The Scientist’s Top 10 ...
(Date:11/22/2019)... ... November 21, 2019 , ... ... Park Comprehensive Cancer Center have announced a major step forward with that therapy, ... have announced that the company, spun off from Roswell Park in 2012, has ...
Breaking Biology News(10 mins):
(Date:1/7/2020)... ... January 06, 2020 , ... EconoFact, a non-profit media ... School at Tufts University, is pleased to announce that it was awarded a ... by Tufts University, and will help to expand the scope, exposure and distribution ...
(Date:12/30/2019)... HARBOR TOWNSHIP, N.J. (PRWEB) , ... December 30, ... ... manufacturer of custom built, helium-based leak testing instruments for the Pharmaceutical, Biotechnology, Medical ... new SIMS Version 1.11.19 21 CFR Part 11 compliant software program specific to ...
(Date:12/18/2019)... (PRWEB) , ... December 17, 2019 , ... ... LLP is pleased to announce that it has hired Dr. Alia Orbin, ... , Orbin is experienced in the preparation, filing and prosecution of patent applications ...
(Date:12/4/2019)... (PRWEB) , ... December 03, 2019 , ... ... antibody products and services, today announced a partnership with the Recombinant Antibody Network ... of Toronto, and UC San Francisco (UCSF) with a common goal to generate ...
Breaking Biology Technology:
Cached News: