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:4/20/2015)... PASADENA, Calif. , April 20, 2015 ... San Gabriel Valley to implant a new miniaturized, wireless ... HF System is the first and only FDA-approved heart ... reduce hospital admissions when used by physicians to manage ... a sensor that is implanted in the pulmonary artery ...
(Date:4/20/2015)... 2015 The announcement comes as ... Records Management (GRM), Ireland,s foremost records ... Having built up an impressive track record of clients within ... within the records management sector in Dubai ... GCC staffbase and employ a further eight staff members at ...
(Date:4/17/2015)... BURNABY, Canada , April 17, 2015 /PRNewswire/ ... projects, growing security concerns, and technological advancement to ... Arabia until 2020   ... " Saudi Arabia Biometric Systems Market Forecast &  Opportunities, 2020 ", biometric ... is projected to register growth at CAGR ...
Breaking Biology News(10 mins):Huntington Memorial Hospital Becomes First in the San Gabriel Valley to Offer Patients a New Heart Failure Monitoring Solution 2Huntington Memorial Hospital Becomes First in the San Gabriel Valley to Offer Patients a New Heart Failure Monitoring Solution 3Glenbeigh Records Management Wins Contract With Dubai Islamic Bank 2Glenbeigh Records Management Wins Contract With Dubai Islamic Bank 3Saudi Arabia Biometric Systems Market to Grow at 22% Through 2020, Says TechSci Research 2Saudi Arabia Biometric Systems Market to Grow at 22% Through 2020, Says TechSci Research 3
(Date:4/20/2015)... , April 20, 2015   Meditope Biosciences, Inc ... its proprietary technology, today announced presentation of data demonstrating ... development of antibody-drug conjugates (ADCs). The data were presented in ... place April 18-22 in Philadelphia . ... data which point to the many commercial applications that ...
(Date:4/20/2015)... Whitehouse Laboratories is pleased and overly excited ... Food and Drug Administration (FDA) inspection and received no ... GMP compliance inspection, as based upon 21CFR Parts 210 ... 6th and was granted NAI (no action indicated) status. ... Good Manufacturing Practice (GMP) quality system required by the ...
(Date:4/17/2015)... ALTO, Calif. , April 17, 2015 ... has received a SBIR grant from the ... the National Institutes of Health (NIH). The ... research efforts in the development of breakthrough ... genomes using specially fabricated substrates. Centrillion has ...
(Date:4/17/2015)... Fremont, CA (PRWEB) April 17, 2015 ... http://www.medispend.com ) for its 20 Most Promising Pharma and ... based on MMIS’s MediSpend global compliance software platform for ... companies is selected by a panel of experts and ... promote technology entrepreneurship. “MMIS’s MediSpend Platform has been on ...
Breaking Biology Technology:Meditope Biosciences Presents Data At The American Association Of Cancer Research (AACR) Annual Meeting Validating Its SnAP Technology Platform 2Whitehouse Laboratories Completes FDA Inspection with No Form 483 – No Observations 2Whitehouse Laboratories Completes FDA Inspection with No Form 483 – No Observations 3MMIS Chosen by CIO Review as Top 20 Most Promising Pharma and Life Science Technology Solution Providers 2015 2
Cached News: