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:
*Name:
*Comment:
*Email:


(Date:3/23/2017)... PUNE, India , March 23, 2017 The report ... Equipment, Touchless Biometric), Industry, and Geography - Global Forecast to 2022", published by ... growing at a CAGR of 29.63% between 2017 and 2022. ... ... Logo ...
(Date:3/22/2017)... , March 21, 2017 ... Cloud used by retailers such as 1-800-Flowers and ... platform — Product Recommendations and Replenishment. Using Optimove,s machine ... more personalized product and replenishment recommendations to their ... also on predictions of customer intent drawn from ...
(Date:3/20/2017)... , March 20, 2017 PMD Healthcare ... personal spirometer and Wellness Management System (WMS), a remote, ... Founded in 2010, PMD Healthcare is a Medical Device, ... a mission dedicated to creating innovative solutions that empower ... With that intent focus, PMD developed the first ever ...
Breaking Biology News(10 mins):
(Date:6/22/2017)... ... June 22, 2017 , ... For the ... has produced a Spotlight series on “Cell Therapy Regulation” for its ... leading experts on the unique regulatory challenges of stem cell medical research. , ...
(Date:6/22/2017)... ... June 22, 2017 , ... Charm Sciences, Inc. is ... AMPH test was determined to be appropriate as a screening test at dairies and ... the Charm EZ system, and the Charm EZ Lite system. These systems are a ...
(Date:6/20/2017)... 2017  Kibow Biotech Inc., a pioneer in developing ... of a new patent covering a unique method for ... Patent and Trademark Office on May 23 rd ... of Bio award in 2014 in San ... approaches to chronic disease. Renadyl™, the first and only ...
(Date:6/19/2017)... ... June 19, 2017 , ... ... service activities supporting EDETEK’s products including training, implementation, support, and client process and ... new role. He has previously held leadership roles for service providers and top-tier ...
Breaking Biology Technology:
Cached News: