HOME >> BIOLOGY >> NEWS
Electric fish in Africa could be example of evolution in action

d no detectable variation in the genetic markers we studied," Arnegard said.

Because all of the 20 or so species of mormyrid have distinct electric signals, Arnegard believes the different impulses of the fish he studies might be their first step in diverging into different species.

"This might be a snapshot of evolution," Arnegard said.

Understanding how animals become different species, a process known as speciation, is a major concern in understanding evolution. Arnegard's fish may allow researchers to test if a specific type of speciation is possible.

One common type of speciation is geographically dependent. Animals diverge into separate species because they become physically isolated from each other. Eventually, genes within each group mutate so that the groups can no longer be considered to be of the same species.

Another type of speciation, which many scientists have found harder to imagine, involves animals that live in the same geographic location but, for some reason, begin to mate selectively and form distinct groups and, ultimately, separate species. This so-called sympatric speciation is more controversial because there have been few accepted examples of it to date.

"Many scientists claim it's not feasible," Arnegard said. "But it could be a detection problem because speciation occurs over so many generations." These Gabon fishes' impulses, however, can change very quickly in comparison. So Arnegard suspects that the different shapes of the electric impulses from these mormyrids might be a first step in sympatric speciation.

One the other hand, the fish could be a single species. "This could be just a polymorphism, like eye color in humans, that violates the fishes' general evolutionary pattern but doesn't give rise to separate species," said Arnegard, who will return to Gabon in June to conduct further tests, funded by the National Geographic Society.


'"/>

Contact: Susan S. Lang
ssl4@cornell.edu
607-255-3613
Cornell University News Service
1-Jun-2006


Page: 1 2

Related biology news :

1. Electric fish conduct electric duets in aquatic courtship
2. Electric fish shed light on ways the brain directs movement
3. Electrical activity alters language used by nerve cells
4. Electrical stimulation boosts stroke recovery
5. Electrical engineer works on personalizing medical treatment
6. Link between sunspots, rain helps predict disease in east Africa
7. Space-borne sensors help Africa tackle water shortage problems
8. New research proves single origin of humans in Africa
9. Clues to future evolution of HIV come from African green monkeys
10. First all-African produced genetically engineered maize is resistant to maize streak virus
11. Biocontrol of invasive water hyacinth contributes to socioeconomic and health improvements in Africa

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Electric fish Africa could example evolution action

(Date:11/6/2014)... yet progress in preventing and treating migratory cancer ... challenging to design drugs that work against metastasis," ... at Harvard Medical School. , "Unfortunately, many ... , Gujral and colleagues have now identified a ... how metastasis begins. Their findings may also inform ...
(Date:11/6/2014)... MD, November 6, 2014 - Insilico Medicine, Inc, ... aging and age related diseases announced a research ... of cancer, Champions Oncology, Inc (OTC: CSBR). , ... for personalized medicine, but Champions Oncology,s TumorGraft technology ... validate the chemotherapy regimen experimentally generating vast amounts ...
(Date:11/5/2014)... RENO – Kelly Redmond has dedicated his career ... knowledge to a general audience. , As deputy ... Climate Center at Nevada,s Desert Research Institute, Redmond ... the management, application and dissemination of climate data ... Annual Fall Meeting in San Francisco on December ...
Breaking Biology News(10 mins):Migration negation 2Migration negation 3Insilico Medicine, Inc announces research collaboration with Champions Oncology, Inc 2Nevada climatologist to be honored at AGU Fall Meeting for lifetime of public outreach 2
(Date:11/27/2014)... November 27, 2014 Spartan Bioscience today ... Food and Drug Safety (MFDS) regulatory approval for its ... genetic results in less than 60 minutes from a ... as an aid for doctors to determine therapeutic strategies ... These include some of the world’s most commonly prescribed ...
(Date:11/27/2014)... 2014 First articles published ... Elsevier , a world-leading provider of scientific, ... to announce the launch of a new journal: ... The launch of Extreme Mechanics Letters ... forefront of applied sciences such as micro and nanotechnologies, ...
(Date:11/27/2014)... 2014 Calcivis, a medical ... tooth decay, today announces that it has completed ... Activity Imaging System. The Calcivis Caries ... and consumable combination designed to transform the assessment ... involves a unique, proprietary bioluminescence approach combined with ...
(Date:11/27/2014)... (PRWEB) November 26, 2014 Biomedical devices ... additive systems to enable 3D manufacture at the micro-nanoscale, ... conditions are among finalists in nine categories for the ... awards are sponsored by SPIE, the international society ... . , Winners will be announced by industry leaders ...
Breaking Biology Technology:Spartan Bioscience Receives Korean Regulatory Approval for First Rapid DNA Test of Mutations Affecting Metabolism of Common Drugs 2Spartan Bioscience Receives Korean Regulatory Approval for First Rapid DNA Test of Mutations Affecting Metabolism of Common Drugs 3Elsevier Announces the Launch of a New Journal: Extreme Mechanics Letters 2Elsevier Announces the Launch of a New Journal: Extreme Mechanics Letters 3Calcivis Completes Clinical Study of Novel Caries Activity Imaging System 2Calcivis Completes Clinical Study of Novel Caries Activity Imaging System 3Finalists Named for 2015 Prism Awards for Photonics Innovation 2Finalists Named for 2015 Prism Awards for Photonics Innovation 3Finalists Named for 2015 Prism Awards for Photonics Innovation 4Finalists Named for 2015 Prism Awards for Photonics Innovation 5
Cached News: