HOME >> BIOLOGY >> NEWS
Study illustrates diversification, speciation in biological "islands"

Lizard species on large Caribbean islands are more numerous than those on smaller islands because there is more evolution going on.

The bigger the island, the faster species proliferate and diversify.

Jonathan B. Losos, Ph.D., associate professor of biology in Arts and Sciences at Washington University in St. Louis, proved this species-area relationship in a study of 143 species of Caribbean Anolis lizards on 147 islands. Focusing on the four largest islands, Cuba, Hispaniola, Jamaica and Puerto Rico, collectively known as the Greater Antilles, Losos showed that the diversity of lizard species is primarily a result of the evolutionary process of speciation, rather than the ecological processes of colonization and extinction.

Losos, and co-author Dolph Schluter, Ph.D., professor of biology at the University of British Columbia, published these results in the Dec. 14, 2000 issue of Nature. The study is an important and novel extension of a 33 year old theory on the genesis of biological diversity.

"When you focus on the larger islands, the rate of speciation is a function of island area," said Losos. "A large island equals more speciation events. At some level this is intuitive, but it has never been demonstrated before that differences in the rate of speciation, of evolution, can produce the species-area relationship."

Losos and Schluters results complement the well-known "Equilibrium Theory of Island Biogeography," proposed in 1967 by the late Robert MacArthur of Princeton University and E.O. Wilson of Harvard University. MacArthur and Wilsons ecological theory proposed that the number of species on any island reflects a balance between the rate at which new species colonize it and the rate at which populations of established species become extinct.

An "island" in this sense is not strictly an island in a stream or ocean, but any ecosystem, say a forest, surrounded by barriers. A major component of this theory i
'"/>

Contact: Tony Fitzpatrick
tony_fitzpatrick@aismail.wustl.edu
314-935-5272
Washington University in St. Louis
13-Dec-2000


Page: 1 2 3

Related biology news :

1. Study: Emission of smog ingredients from trees is increasing rapidly
2. Study explores gene transfer to modify underlying course of Alzheimers disease
3. Study reveals why eyes in some paintings seem to follow viewers
4. Study by Israeli scientists provides insight on DNA code
5. Study reveals first genetic step necessary for prostate cancer growth
6. Study of flu patients reveals virus outsmarting key drug
7. Study in Science reveals recreational fishing takes big bite of ocean catch
8. Study suggests cell-cycle triggers might be cancer drug targets
9. Study narrows search for genes placing men at increased risk for prostate cancer
10. Study links high carbohydrate diet to increased breast cancer risk
11. Study explains spatial orientation differences between sexes

Post Your Comments:
(Date:11/18/2014)... 17, 2014 The Parenteral Drug Association (PDA) today ... will speak and at least seven more will participate in ... Omni Shoreham Hotel in Washington D.C. , ... have significant support from the regulatory agencies in ... in our effort to help advance the use of ...
(Date:11/15/2014)...  While we may still be a few years away ... Trek" to gain instant access to all that ailed his ... and tablets for monitoring and measuring our health are cropping ... seem a tad Orwellian to some, but a new survey ... technological opportunities into their healthcare regime. These are ...
(Date:11/11/2014)...  Forensicon, Inc., a Chicago -based ... the promotion of Yaniv Schiff from Senior ... Schiff,s new role as Director, he will lead company ... examiners and provide leadership within the company,s digital forensics ... Schiff joined Forensicon in 2006 ...
Breaking Biology News(10 mins):FDA's Janet Woodcock, EMA's Emer Cooke Headline PDA Quality Metrics Conference 2Americans May Be Ready for a Brave New World of Healthcare 2Americans May Be Ready for a Brave New World of Healthcare 3Americans May Be Ready for a Brave New World of Healthcare 4Yaniv Schiff Promoted to Director of Digital Forensics at Forensicon, Inc. 2
(Date:11/24/2014)... The new video, “ Save ... demonstrates how to reduce the number of instruments ... panel design can be complicated, requiring multiple chemical ... corrosion and deposition. Dedicated single and dual channel ... panel space. Additionally, installing and maintaining each transmitter, ...
(Date:11/24/2014)... Senior Vice President, General Manager for Clinical ... acumen Elsevier , a world-leading provider ... congratulates Diane Bartoli , Senior Vice President and ... Solutions, for being recognized in the 13 th ... Profiles in Diversity Journal ® . ...
(Date:11/22/2014)... November 21, 2014 Two new educational webinars ... comes next for ALS research and how the pharmaceutical industry ... the Ice Bucket Challenge: Where Does the ALS Money Go? ... 2 December 2014, Time: 1:30pm ET, Register to ... speaker Dr. Merit Cudkowicz, Julianne Dorn Professor of Neurology at ...
(Date:11/22/2014)... 21, 2014 Prominent academics, leaders ... gather on December 3rd at Genetic Rx, a ... GeneticRx will take place at the Joseph B. ... will discuss the present and future of genetic ... and gene editing—as well as the treatment of ...
Breaking Biology Technology:New Video Shows How to Simplify Cycle Chemistry Sample Panels to Save Time and Costs 2Elsevier Clinical Solutions' Diane Bartoli Featured In Profiles in Diversity Journal's 13th Annual Women Worth Watching Issue 2Elsevier Clinical Solutions' Diane Bartoli Featured In Profiles in Diversity Journal's 13th Annual Women Worth Watching Issue 3DrugDev Webinars in December to Explore What Comes Next for ALS Research and How We Can Make Life Easier for Clinical Sites 2Pioneering Academics and Key Industry Leaders to Discuss Rare Diseases and the Emergence of New Genetic Medicines at Genetic Rx on December 3rd 2
Cached News: