Navigation Links
Road runoff spurring spotted salamander evolution
Date:2/1/2012

Spotted salamanders exposed to contaminated roadside ponds are adapting to their toxic environments, according to a Yale paper in Scientific Reports. This study provides the first documented evidence that a vertebrate has adapted to the negative effects of roads apparently by evolving rapidly.

Salamanders breeding in roadside ponds are exposed to a host of contaminants from road runoff. Chief among these is sodium chloride from road salt, which reaches average concentrations of 70 times higher in roadside ponds compared to woodland ponds located several hundred feet from the road.

"While the evolutionary consequences of roads are largely unknown, we know they are strong agents of natural selection and set the stage for fast evolution," said Steven Brady, the study's author and a doctoral student at the Yale School of Forestry & Environmental Studies. "These animals are growing up in harsh environments where they face a cocktail of contaminants, and it appears that they are evolving to cope with them."

Brady found that salamanders in roadside ponds have higher mortality, grow at a slower rate and are more than likely to develop L-shaped spines and other disfigurements. In roadside ponds, only 56 percent of salamander eggs survive the first 10 weeks of development, whereas 87 percent survive in the woodland ponds. As roadside ponds become more toxic, the surviving salamanders may develop a genetic advantage over their counterparts living in woodland ponds.

The salamanders that survive year after year in the roadside ponds appear to have adapted to the harsh conditions. "The animals that come from roadside ponds actually do bettersubstantially betterthan the ones that originate from woodland ponds when they're raised together," Brady said.

That animals adapt to human activities is not altogether new. For example, fish have begun to mature at smaller sizes in response to commercial fishing. But whereas humans directly utilize fish for consumption, salamanders are just bystanders to human activities. This suggests that the majority of species, which are not specifically targeted for human use, may be experiencing profound evolutionary consequences. And it appears that even species not being driven to extinctionand seldom thought aboutare changing.

"This adaptation is certainly encouraging for conservation," said Brady. "But our modern footprint is fundamentally changing species in ways we don't understand and, critically, we don't know if these adaptive responses will keep pace with environmental change."


'/>"/>
Contact: David DeFusco
david.defusco@yale.edu
203-436-4842
Yale University
Source:Eurekalert

Related biology news :

1. Manure runoff depends on soil texture
2. Plant buffers can slow runoff of veterinary antibiotics
3. Pelletized manure reduces toxic runoff
4. Arsenic in field runoff linked to poultry litter
5. Super socks help stem pollution runoff
6. Compost filter socks improve runoff from croplands
7. Tracking phosphorus runoff from livestock manure
8. Cover crops reduce erosion, runoff
9. Storm runoff and sewage treatment outflow contaminated with household pesticides
10. Canna can: Ornamental eliminates pollutants from stormwater runoff
11. UNH: Pavement sealcoat a source of toxins in stormwater runoff
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/19/2016)... , UAE, April 20, 2016 ... implemented as a compact web-based "all-in-one" system solution for ... biometric fingerprint reader or the door interface with integration ... modern access control systems. The minimal dimensions of the ... readers into the building installations offer considerable freedom of ...
(Date:4/13/2016)... April 13, 2016  IMPOWER physicians supporting Medicaid patients ... a new clinical standard in telehealth thanks to a ... the higi platform, IMPOWER patients can routinely track key ... body mass index, and, when they opt in, share ... visit to a local retail location at no cost. ...
(Date:3/23/2016)... , March 23, 2016 ... erhöhter Sicherheit Gesichts- und Stimmerkennung mit Passwörtern ... (NASDAQ: MESG ), ein führender ... das Unternehmen mit SpeechPro zusammenarbeitet, um erstmals ... Finanzdienstleistungsbranche, wird die Möglichkeit angeboten, im Rahmen ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... ... June 23, 2016 , ... ... (Yeast and Mold) microbial test has received AOAC Research Institute approval 061601. , ... tests introduced last year,” stated Bob Salter, Vice President of Regulatory and Industrial ...
(Date:6/23/2016)... , ... June 23, 2016 , ... ... announced the launch of the Supplyframe Design Lab . Located in Pasadena, ... explore the future of how hardware projects are designed, built and brought to ...
(Date:6/23/2016)... Calif. , June 23, 2016  Blueprint Bio, ... biological discoveries to the medical community, has closed its ... Matthew Nunez . "We have received ... with the capital we need to meet our current ... essentially provide us the runway to complete validation on ...
(Date:6/23/2016)... Pleasant Prairie, WI (PRWEB) , ... June 23, ... ... sciences consultancy focused on quality, regulatory and technical consulting, provides a free ... webinar is presented on July 13, 2016 at 12pm CT at no charge. ...
Breaking Biology Technology: