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:7/31/2014)... bigeye tuna movements in the northwestern Atlantic Ocean led ... Center at the University of Massachusetts Amherst, found among ... range with pronounced north-south movements from Georges Bank to ... off Cape Hatteras southwest of Bermuda for foraging. , ... study one of the most important commercial tuna species ...
(Date:7/31/2014)... Science Foundation (NSF), counters a widely-held scientific view ... instead that certain Arctic lakes store more greenhouse ... , The study, published this week in the ... which occur as permafrost thaws and creates surface ... what was previously frozen land into lakes. , ...
(Date:7/31/2014)... GAINESVILLE, Fla. --- By tracing nearly 3,000 genes ... moths, University of Florida scientists have created an ... to use large-scale, next-generation DNA sequencing. , ... more closely related to small moths than to ... how butterflies evolved. The study also found that ...
Breaking Biology News(10 mins):Study of bigeye tuna in Northwest Atlantic uses new tracking methods 2Study of bigeye tuna in Northwest Atlantic uses new tracking methods 3Certain Arctic lakes store more greenhouse gases than they release 2UF study advances 'DNA revolution,' tells butterflies' evolutionary history 2UF study advances 'DNA revolution,' tells butterflies' evolutionary history 3
(Date:7/31/2014)... 31, 2014 Today BioSpace , the leading life sciences ... campaign spotlighting the life sciences community in Illinois , ... Kansas , Michigan , Minnesota ... Ohio and Wisconsin . ... of all job postings on BioSpace originating in this region in 2013. ...
(Date:7/31/2014)... ability to see through organs and even the entire ... as fine-grained cellular structures has been a long-time dream ... Press July 31st in the journal Cell ... methods for making opaque organs, bodies, and human tissue ... intact. The protocols could pave the way for a ...
(Date:7/31/2014)... According to a new market ... - Global Industry Analysis, Size, Share, Growth, Trends and ... USD 88.5 million in 2011, which is expected to ... CAGR of 53.8% from 2013 to 2023. ... Increasing demand for energy efficient displays ...
(Date:7/31/2014)... 2014 According to a new ... Medical Devices Market (Diagnostic Electrodes - ECG, EEG, EMG, ... Pacemakers, Defibrillators, Electrosurgical and Other Electrodes) - Global Industry ... 2019," the global electrodes market for medical devices was ... estimated to reach a market worth USD 1,451.2 million ...
Breaking Biology Technology:Midwest Biotech Leaders Featured On BioSpace Map 2See-through organs and bodies will accelerate biomedical discoveries 2Global Quantum Dots Market is Expected to Reach USD 8,246.8 Million in 2023: Transparency Market Research 2Global Quantum Dots Market is Expected to Reach USD 8,246.8 Million in 2023: Transparency Market Research 3Global Quantum Dots Market is Expected to Reach USD 8,246.8 Million in 2023: Transparency Market Research 4Electrodes for Medical Devices Market Expected to Reach USD 1.45 Billion Globally in 2019: Transparency Market Research 2Electrodes for Medical Devices Market Expected to Reach USD 1.45 Billion Globally in 2019: Transparency Market Research 3Electrodes for Medical Devices Market Expected to Reach USD 1.45 Billion Globally in 2019: Transparency Market Research 4Electrodes for Medical Devices Market Expected to Reach USD 1.45 Billion Globally in 2019: Transparency Market Research 5Electrodes for Medical Devices Market Expected to Reach USD 1.45 Billion Globally in 2019: Transparency Market Research 6
Cached News: