Navigation Links
Researchers use entire islands in the Bahamas to test survival of the fittest
Date:5/10/2010

By using entire islands as experimental laboratories, two Dartmouth biologists have performed one of the largest manipulations of natural selection ever conducted in a wild animal population. Their results, published online on May 9 by the journal Nature, show that competition among lizards is more important than predation by birds and snakes when it comes to survival of the fittest lizard.

"When Tennyson wrote that nature is 'red in tooth and claw', I think the image in his head was something like a Discovery Channel version of a lion chasing down a gazelle" said Ryan Calsbeek, an assistant professor of biology at Dartmouth College and a co-author of the study. "While that may often be the case, intense natural selection can also arise through competition. Sometimes, death by competitor can be more important than death by predator".

To show this effect, the researchers covered multiple small islands in the Bahamas with bird-proof netting to keep predatory birds at bay. Other islands were left open to bird predators, and on still other islands, the researchers added predatory snakes to expose the lizards to both bird and snake predators. Next, they tracked the lizards over the summer to record which lizards lived and which died on the different islands.

"We found repeated evidence that death by predators occurred at random with respect to traits like body size and running ability" said Robert Cox, a post-doctoral researcher at Dartmouth and Calsbeek's co-author. "But we also found that increasing the density of lizards on an island consistently created strong natural selection favoring larger size and better running ability."

Calsbeek and Cox explain that in high-density populations, the intensity of competition for food, space, and other resources is likely to increase. In turn, this increased competition favors the biggest, toughest lizards on the island.

"The lizards play for keeps," said Calsbeek, "and
'/>"/>

Contact: Sue Knapp
sue.knapp@dartmouth.edu
603-646-3661
Dartmouth College
Source:Eurekalert

Page: 1 2

Related biology news :

1. Researchers discover genetic link between both types of ALS
2. UBC researchers design new biomaterial that mimics muscle elasticity
3. UCLA researchers show how worlds smallest coffee ring may help biosensors detect disease
4. Researchers find melanoma not caused by early UVA light exposure
5. Bugging out: NC State researchers help track wayward pests through mapping
6. Aboriginal hunting and burning increase Australias desert biodiversity, Stanford researchers find
7. Ben-Gurion U researchers isolate microalgal strain that could reduce cholesterol
8. JGH researchers help pinpoint osteoporosis genes
9. Researchers recommend pregnant women take 4,000 IU vitamin D a day
10. Gene therapy sets stage for new treatments for inherited blindness, Penn veterinary researchers say
11. Pitt researchers discover big role for microRNA in lethal lung fibrosis
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/26/2015)... The Granite Club, Canada,s ... announced it has implemented a state-of-the-art access and security ... and staff, while restricting access to authorized users only. ... IMID Access system because it has the perfect combination ... in addition to unparalleled security," said James DiRenzo ...
(Date:3/23/2015)... SoundView Technology Group issues a new research update ... Wocket smart wallet. SoundView was one of the selected user groups ... the Wocket in multiple scenarios and outlets. ... retailers, making both debit and credit card payments.  ... the company meets their plans in 2015, it would push ...
(Date:3/20/2015)... , Mar. 19, 2015 Research and Markets ... "Hand Geometry - Global Strategic Business Report" report to ... for Hand Geometry in US$ Thousands. The report provides separate ... Japan , Europe , ... , and Rest of World. Annual estimates and ...
Breaking Biology News(10 mins):Granite Club First Private Club in North America to Implement FST Biometrics Secure Access Solution, as Part of Multi-million Dollar Expansion 2Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 2Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 3Technology Research Note Update from SoundView; Real-World Usage and Feedback of Wocket Smart Wallet at CVS, Whole Foods and other Retailers 4Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 2Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 3Hand Geometry - Global Strategic Business Report 2015: An Essential Security Component for both Government & Enterprise Sector 4
... The 2007 American College of Neuropsychopharmacology Annual Meeting will ... from the worlds leading scientists. Presentations include innovative ... disorder, autism and addiction. SELECTED PANELS ... Cancer and Schizophrenia A series of studies elucidates evidence ...
... FOR IMMEDIATE RELEASE First identification of blood on ... Scientists in France are reporting for the first time that ... once the source of almost half the worlds gold ... their works of art. In a study scheduled for the ...
... numerals that is superior to that of human adults, ... Biology, a publication of Cell Press. There are ... humans are superior to chimpanzees in all cognitive functions, ... imagine that chimpanzeesyoung chimpanzees at the age of fivehave ...
Cached Biology News:New studies on schizophrenia, depression, trauma and autism highlight annual meeting 2New studies on schizophrenia, depression, trauma and autism highlight annual meeting 3American Chemical Society's Weekly PressPac -- Nov. 28, 2007 2American Chemical Society's Weekly PressPac -- Nov. 28, 2007 3American Chemical Society's Weekly PressPac -- Nov. 28, 2007 4American Chemical Society's Weekly PressPac -- Nov. 28, 2007 5American Chemical Society's Weekly PressPac -- Nov. 28, 2007 6American Chemical Society's Weekly PressPac -- Nov. 28, 2007 7American Chemical Society's Weekly PressPac -- Nov. 28, 2007 8Young chimps top adult humans in numerical memory 2
(Date:4/16/2015)... A new infographic compiles useful information about ... to learn how Apple’s new framework can change the ... ideal since Apple made Research Kit available ... framework for developing medical research apps that Apple announced ... to collect secure clinical data and communicate via subjects’ ...
(Date:4/16/2015)... 16, 2015 Avelas Biosciences, an in ... surgeries, announced today that it has initiated a Phase ... in women with primary, non-recurrent breast cancer undergoing surgery. ... the addition of Steven Chen , M.D., as ... label, dose escalation study will enroll up to 39 ...
(Date:4/16/2015)... British Columbia and MENLO PARK, ... Pharmaceuticals, Inc. (OTCQX: DMPI) (DelMar and the Company), ... cancer therapies in new orphan drug indications, today announced ... been added as a clinical trial site for the ... with refractory glioblastoma multiforme (GBM), the most common and ...
(Date:4/16/2015)... 2015 Dana-Farber Cancer Institute and ... Resolution Bioscience, Inc. today announced the successful completion ... blood-based, clinic ready, Next Generation Sequencing (NGS) assay ... is the first to demonstrate the successful sequencing ... in blinded plasma samples and highlights the ability ...
Breaking Biology Technology:Infographic Illustrates Potential for Research Kit to Impact Clinical Research 2Infographic Illustrates Potential for Research Kit to Impact Clinical Research 3Avelas Biosciences Initiates Phase 1b Trial of AVB-620 in Breast Cancer Patients 2Avelas Biosciences Initiates Phase 1b Trial of AVB-620 in Breast Cancer Patients 3DelMar Pharmaceuticals Adds Fourth Clinical Trial Site in Phase I/II Multicenter Study of VAL-083 for Recurrent Malignant Glioma 2DelMar Pharmaceuticals Adds Fourth Clinical Trial Site in Phase I/II Multicenter Study of VAL-083 for Recurrent Malignant Glioma 3DelMar Pharmaceuticals Adds Fourth Clinical Trial Site in Phase I/II Multicenter Study of VAL-083 for Recurrent Malignant Glioma 4DelMar Pharmaceuticals Adds Fourth Clinical Trial Site in Phase I/II Multicenter Study of VAL-083 for Recurrent Malignant Glioma 5Resolution Bioscience announces successful collaboration on a novel, non-invasive, targeted NGS test for lung cancer 2Resolution Bioscience announces successful collaboration on a novel, non-invasive, targeted NGS test for lung cancer 3
... CAMBRIDGE, England, October 12 Crescendo Biologics,("Crescendo") today ... to advance the development of its fragment antibody technology,platforms. ... Paris-based,venture capital firm, with Aitua, Avlar BioVentures and the ... Crescendo brings together highly innovative in vivo and in ...
... , SAN FRANCISCO, Oct. 12 Dr. Michael ... implant inventor, brain plasticity expert and ... Medicine (IOM) today in Washington, D.C. Also a member of ... a small group of scientists and doctors in the U.S. ...
... ANA, Calif., Oct. 12 Selexis SA ("Selexis") and ... present results of a recent collaborative effort combining the ... IS CHO Culture System, demonstrating the rapid production of ... cell lines. Irvine and Selexis will jointly present ...
Cached Biology Technology:Crescendo Biologics Raises GBP4.5 million in Seed-Funding Led by Sofinnova Partners 2Crescendo Biologics Raises GBP4.5 million in Seed-Funding Led by Sofinnova Partners 3Crescendo Biologics Raises GBP4.5 million in Seed-Funding Led by Sofinnova Partners 4Dr. Michael Merzenich Joins Venerable Short List Honored for Cutting-Edge Neuroscientific Research 2Dr. Michael Merzenich Joins Venerable Short List Honored for Cutting-Edge Neuroscientific Research 3Irvine Scientific and Selexis to Announce Results of Successful Collaboration 2
Request Info...
... Services include: ,ISH Protocol Development ... Analyses ,RNA and DNA Screenings ... and Tissues ,Double Labeling of ... and Tissues ,RNA and DNA ...
Request Info...
... Quality ISO 9001:2000 Certified USDA Research ... Validated, SOP's Training AALAS Certified ... All Procedures GLP Documentation Upon Request ... shopping point for all your custom immunology ...
Biology Products: