Amphibian Mortality Due To UV Radiation

New Haven, Conn. D Many frog and other amphibian species throughout the world appear to be experiencing declining populations, with several species already extinct and others showing alarming rates of deformities. No single cause has been identified. Some scientists believe habitat disturbances are to blame, although declines have occurred in relatively undisturbed areas.

Now, field experiments in the Oregon Cascade Mountains have confirmed what many scientists had suspected -- ambient levels of ultraviolet-B (UV-B) radiation from the sun can cause high rates of mortality and deformity in some species of frogs and other amphibians. The earth is shielded from UV radiation by the ozone layer, which is believed to be thinning because of the increased use of chlorofluorocarbons as refrigerants, solvents and cleaning agents.

"There has been a great deal of recent attention to the suspected increase in amphibian deformities. However, most reports have been anecdotal, and no experiment in the field under natural conditions had been performed previously," said Joseph M. Kiesecker of Yale University, who presented his findings Feb. 17 at the annual meeting of the American Association for the Advancement of Science in Philadelphia.

Kiesecker, along with Andrew R. Blaustein of Oregon State University, compared the embryos of long-toed salamanders shielded from UV-B radiation by mylar filters to unshielded embryos. They found that 95 percent of the shielded embryos hatched, compared to only 14.5 percent of the unshielded embryos. Even more striking, only 0.5 percent of the surviving shielded salamanders had deformities while 91.9 percent of the unshielded salamanders had deformities. Malformed tails, blisters and edema were the most frequent deformities.

"The recent thinning of the protective ozone layer in the upper atmosphere has been linked to increased risks of skin cancer and cataracts in humans as well as t

Contact: Cynthia Atwood
203 432-1326
Yale University

Page: 1 2 3

Related biology news :

1. Amphibians life stages influence contaminant transfer from aquatic to terrestrial environments
2. Amphibians and crippling parasites
3. Amphibian mortality linked to global climate change
4. Amphibian mortality linked to climate change
5. Amphibian declines and deformities: what is the latest?
6. Amphibian declines complicated, disturbing
7. Amphibian Revival: Build It And They Will Come
8. Secretary Babbitt To Visit Smokies To Learn More Of Scientific Amphibian Project And Declining Frog And Toad Populations
9. At Last, Zoologists May Know What Is Killing The Worlds Amphibians
10. USGS Responds to Amphibian Declines With Program In Great Smokey Mountains National Park
11. Increasing Threat Of Extinction For Amphibians? Scientists To Seek Answers At NSF Workshop

Post Your Comments:

(Date:4/5/2017)... 5, 2017 Today HYPR Corp. , ... server component of the HYPR platform is officially ... end-to-end security architecture that empowers biometric authentication across Fortune ... already secured over 15 million users across the financial ... connected home product suites and physical access represent a ...
(Date:3/30/2017)... 2017  On April 6-7, 2017, Sequencing.com will host ... hackathon at Microsoft,s headquarters in Redmond, ... on developing health and wellness apps that provide a ... Genome is the first hackathon for personal genomics ... companies in the genomics, tech and health industries are ...
(Date:3/28/2017)... , March 28, 2017 ... Biometrics), Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video ... and Region - Global Forecast to 2022", published by ... in 2016 and is projected to reach USD 75.64 ... 2017 and 2022. The base year considered for the ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... ... of a complex biological network, a depiction of a system of linkages and ... Dmitry Korkin, PhD, associate professor of computer science at Worcester Polytechnic Institute (WPI) ...
(Date:10/12/2017)... (PRWEB) , ... October 12, 2017 , ... ... partners with the pharmaceutical and biotechnology industries to improve patient outcomes and quality ... Several trends in analytical testing are being attributed to new regulatory requirements for ...
(Date:10/11/2017)... (PRWEB) , ... October 11, 2017 , ... ComplianceOnline’s Medical ... place on 7th and 8th June 2018 in San Francisco, CA. The Summit brings ... well as several distinguished CEOs, board directors and government officials from around the world ...
(Date:10/11/2017)... ... October 11, 2017 , ... A new ... rates in frozen and fresh in vitro fertilization (IVF) transfer cycles. ... to IVF success. , After comparing the results from the fresh and frozen ...
Breaking Biology Technology:
Cached News: