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:11/21/2014)... -- Earlier this year Donald Spector , Chairman of ... the most prolific inventors in the world, got a ... to third party agencies. Spector envisioned this technology even ... earliest known patents in this area. Now major technology ... care, elder care and hospital applications. This technology has ...
(Date:11/18/2014)... 2014  The Secure Identity & Biometrics Association ... announce the formation of The Airport Entry and ... Identity and Biometric Entry and Exit Solutions Framework ... support from BORDERPOL, the international non-profit organization that ... expertise regarding border security, traveler and migration systems. ...
(Date:11/15/2014)... , Nov. 13, 2014  While we may still be ... McCoy used in "Star Trek" to gain instant access to ... to work with smartphones and tablets for monitoring and measuring ... healthcare world. This may seem a tad Orwellian to some, ... adopt some of these technological opportunities into their healthcare regime. ...
Breaking Biology News(10 mins):Patented Biosensor Wearable Technology Provides a More Civilized Method of Quarantine 2Patented Biosensor Wearable Technology Provides a More Civilized Method of Quarantine 3Patented Biosensor Wearable Technology Provides a More Civilized Method of Quarantine 4Identity Management, Document Authentication and Biometric Companies Form "The Airport Entry and Exit Working Group", Releasing the Framework to Help Guide the Department of Homeland Security and Congress Towards Solutions 2Identity Management, Document Authentication and Biometric Companies Form "The Airport Entry and Exit Working Group", Releasing the Framework to Help Guide the Department of Homeland Security and Congress Towards Solutions 3Americans 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 4
(Date:12/19/2014)... iLab Solutions, the global leader in ... Bryant as the new Director of Institutional Implementations and ... These two new leadership positions were created to support ... that iLab continues to meet the needs of its ... iLab has been deployed at over 450 core facilities ...
(Date:12/19/2014)... 18, 2014  Decision Resources Group finds that the ... will grow moderately through 2023 as the aging population, ... of dental biomaterials all spur procedure volumes. Growth will ... China and India ... within reach for a larger proportion of the population. ...
(Date:12/17/2014)... The Activated Carbon Manufacturing industry ... IBISWorld updated its original industry research report. , ... intensified focus on environmental policy. Over the five years ... power plants and a range of other industrial facilities ... Sarah Kahn, “a range of downstream industrial sectors rely ...
(Date:12/17/2014)... 2014 Ipsen Biopharmaceuticals, Inc., an ... IPSEY), today announced that Somatuline® Depot® ... was approved by the U.S. Food and Drug ... tumors (GEP-NETs) in adult patients with unresectable, well ... to improve progression-free survival (PFS). , “The approval ...
Breaking Biology Technology:iLab Solutions Announces Two New Leadership Positions to Meet the Needs of Its Growing Customer Base 2Asia Pacific Dental Biomaterial Market Will Grow Strongly Through 2023 2Asia Pacific Dental Biomaterial Market Will Grow Strongly Through 2023 3Activated Carbon Manufacturing in the US Industry Market Research Report Has Been Updated from IBISWorld 2Activated Carbon Manufacturing in the US Industry Market Research Report Has Been Updated from IBISWorld 3Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 2Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 3Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 4Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 5Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 6Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 7Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 8
Cached News: