Navigation Links
Pressured by predators, lizards see rapid shift in natural selection

Countering the widespread view of evolution as a process played out over the course of eons, evolutionary biologists have shown that natural selection can turn on a dime -- within months -- as a population's needs change. In a study of island lizards exposed to a new predator, the scientists found that natural selection dramatically changed direction over a very short time, within a single generation, favoring first longer and then shorter hind legs.

The findings, by Jonathan B. Losos of Harvard University and colleagues, are detailed this week in the journal Science. Losos did much of the work before joining Harvard earlier this year from Washington University in St. Louis.

"Because of its epochal scope, evolutionary biology is often caricatured as incompatible with controlled experimentation," says Losos, professor of organismic and evolutionary biology in Harvard's Faculty of Arts and Sciences and curator in herpetology at the Harvard Museum of Comparative Zoology. "Recent work has shown, however, that evolutionary biology can be studied on short time scales and that predictions about it can be tested experimentally. We predicted, and then demonstrated, a reversal in the direction of natural selection acting on limb length in a population of lizards."

Losos and colleagues studied populations of the lizard Anolis sagrei on minuscule islands, or cays, in the Bahamas. They introduced to six of these cays a larger, predatory lizard (Leiocephalus carinatus) commonly found on nearby islands and known as a natural colonizer of small cays. The scientists kept six other control cays predator-free and exhaustively counted, marked, and measured lizards on all 12 isles.

Anolis sagrei spends much of its time on the ground, but previous research has shown that when a terrestrial predator is introduced, these lizards take to trees and shrubs, becoming increasingly arboreal over time. Losos and his colleagues hypothesized that immediately fol
'"/>

Source:Harvard University


Page: 1 2

Related biology news :

1. Creeping crinoids! Sea lilies crawl to escape predators, new video shows
2. Nice guys do finish first in lizards evolutionary race
3. Global survey of lizards reveals greater abundance of animals on islands than on mainland ecosystems
4. Mouse brain cells rapidly recover after Alzheimers plaques are cleared
5. Researchers develop rapid diagnostic tool for pathogen identification
6. Variation in HIVs ability to disable host defenses contributes to rapid evolution
7. New technique rapidly detects illness-causing bacteria
8. NASA satellite data provides rapid analysis of Amazon deforestation
9. Prions rapidly remodel good protein into bad, Brown study shows
10. Customized gene chip provides rapid detection of genetic changes in childrens cancer
11. A bugs life: Exceptional genomic stability yet rapid protein evolution in a carpenter ant mutualist
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Pressured predators lizards see rapid shift natural selection

(Date:7/24/2014)... a low vision specialist at The University of Texas ... been awarded a grant to help Harris County residents ... or surgery. , Even with corrective lenses, many people ... there are a variety of low vision devices, such ... their vision loss. , Iyer is using the three-year, ...
(Date:7/24/2014)... week for an all-day public forum on a $1.7 ... to dredge toxic sediment from an eight-mile stretch of ... the plan, which proposes removing 4.3 million cubic yards ... one of the largest cleanups in the agency,s history. ... , "We need to ensure the future well-being of ...
(Date:7/24/2014)... the United States, wildland managers often utilize the silvicultural ... (ladder fuels). These cuttings and other post-logging debris ... in order to dispose of the material. To improve ... cover all or part of the debris pile with ... in order to keep water out. A recent study ...
Breaking Biology News(10 mins):UTHealth Dr. Bhavani Iyer awarded low vision grant 2Experts Weigh the Pros and Cons of a $1.7 Billion EPA Cleanup Plan for the Passaic River at an NJIT 2Study gives new perspective on agricultural plastic, debris burning, and air quality 2
... of Energy,s Advanced Research Projects Agency (ARPA-E) has awarded ... Carolina State University to support research into the creation ... in high-temperature environments. "Most biofuels, such as ethanol ... plants through photosynthesis. Our project would cut out the ...
... A system that allows precise targeting of radiotherapy using ... dose of radiation they administered to lung and liver cancers ... the 2nd European Lung Cancer Conference. "With this study ... have a precise system that can give information at any ...
... is available in Spanish . , Agricultural ... Research Center in Burns, Ore., are taking a careful ... high desert rangelands. Cattle share this habitat with ... the showy commotion they create during mating season. But ...
Cached Biology News:NC State wins ARPA-E grant to study extremophile production of biofuels 2ARS scientists study effects of grazing on grouse habitat 2
(Date:7/25/2014)... At the request of the AMA, the ... for the public comment period (Docket No. FAA-2014-0396) for ... established by Congress as part of the FAA Modernization ... the new deadline for comments as September 23, 2014. ... published in the Federal Register on July 25, 2014, ...
(Date:7/25/2014)... , July 25, 2014 Sinovac Biotech Ltd. ... products in China , today announced that ... quarter ended June 30, 2014, after market close on Thursday, ... call prior to the market opening on Friday, August 15, ... 8:00 p.m. China Standard Time) to review the Company,s financial ...
(Date:7/24/2014)... July 24, 2014 -- Keryx Biopharmaceuticals, Inc. (Nasdaq:KERX) (the ... randomized, active control Phase 3 study of Zerenex (ferric ... for the treatment of hyperphosphatemia in patients with end-stage ... binding and iRon delivery with FErric CiTrate in EsrD) ... the American Society of Nephrology ( JASN ). ...
(Date:7/24/2014)... RIDGE, Tenn., July 24, 2014 -- A novel combination ... the Department of Energy,s Oak Ridge National Laboratory an ... for its unusual physical and electrochemical properties. , ... how oxygen affects the surface of a perovskite manganite, ... behavior. The new avenue to understand surface behavior could ...
Breaking Biology Technology:FAA Grants Comment Extension at the Request of AMA 2Sinovac to Host Conference Call to Report Second Quarter 2014 Unaudited Financial Results 2Zerenex (ferric citrate) long-term Phase 3 study results published in JASN 2Zerenex (ferric citrate) long-term Phase 3 study results published in JASN 3Zerenex (ferric citrate) long-term Phase 3 study results published in JASN 4ORNL study reveals new characteristics of complex oxide surfaces 2
... , June 25 Ruedi Waeger , Ph.D., former president ... of Directors, was honored with the Robert W. Reilly Leadership award June ... , , , ... Plasma Protein Therapeutics Association (PPTA) and recognizes individuals who exemplify the leadership qualities ...
... Beardsworth Consulting Group, Inc. announces the appointments of ... Robert W. Malone , M.D. as the company,s Medical Director, Vaccines. ... Dr. Alison Martin ... of clinical research experience.  She joins Beardsworth from the National Cancer Institute ...
... HOPKINTON, Mass. , June 25 Caliper Life ... and services for drug discovery and life sciences research, hosted its ... 9 and 10. This thought-leadership conference is focused on sharing ... process, leading to the next generation of breakthrough diagnostics and therapies. ...
Cached Biology Technology:Ruedi Waeger Receives the 2010 Robert W. Reilly Leadership Award from Plasma Protein Therapeutics Association 2Alison Martin, MD and Robert W. Malone, MD Join Beardsworth 2Caliper Owners Group Meeting Showcases Critical Role of Biopharma and Academic Researchers for Improving Healthcare and Quality of Life 2Caliper Owners Group Meeting Showcases Critical Role of Biopharma and Academic Researchers for Improving Healthcare and Quality of Life 3
AedestaTM Animal Organ/Tissue Perfusion Soln....
ANTI FLAG EP CL VEC...
Cross reactivity to St. Louis encephalitis (MSI-7) is determined by ELISA....
EGTA, 10 g. Ethylene glycol-O,O-bis-[2-amino-ethyl]-N,N,N,N,-tetraacetic acid.Assay: > 99.0%. Category: Nucleotides & Enzymes & Biochemicals, Ultrapure Biochemicals ....
Biology Products: