Navigation Links
Competition breeds new fish species, study finds
Date:2/28/2014

Competition may play an important role during the evolution of new species, but empirical evidence for this is scarce, despite being implicit in Charles Darwin's work and support from theoretical studies.

Dr Martin Genner from Bristol's School of Biological Sciences and colleagues used population genetics and experimental evidence to demonstrate a role for competition that leads to the differentiation of new species within the highly diverse cichlid fishes of Lake Tanganyika in East Africa.

They found that the cichlid fish Telmatochromis temporalis shows two genetically distinct ecomorphs (local varieties of a species whose appearance is determined by its ecological environment), that strongly differ in body size and the habitat in which they live.

Dr Genner said: "We found large-sized individuals living along the rocky shoreline of Lake Tanganyika and, in the vicinity of these shores, we found small-sized individuals, roughly half the size of the large ones, that live and breed in accumulations of empty snail shells found on sand."

According to the study, the bigger fish outcompete the smaller ones, driving them away from the preferred rocky habitats and into the neighbouring sand, where the smaller fish find shelter for themselves and their eggs in empty snail shells.

"In effect, big and small fish use different habitats; and because of this habitat segregation, fish usually mate with individuals of similar size. There is virtually no genetic exchange between the large- and small-bodied ectomorphs," Dr Genner commented.

Speciation occurs when genetic differences between groups of individuals accumulate over time. In the case of Telmatochromis there are no obvious obstacles to the movement and interaction of individuals. But, the non-random mating between large- and small-bodied fish sets the stage for the evolutionary play.

Dr Genner said: "The relevance of our work is tha
'/>"/>

Contact: Hannah Johnson
hannah.johnson@bristol.ac.uk
44-117-928-8896
University of Bristol
Source:Eurekalert

Page: 1 2

Related biology news :

1. Menopause evolved to prevent competition between in-laws
2. Winners named in 2012 AAAS Kavli Science Journalism Award Competition
3. An international competition reaffirms the potential of bioinformatics in the diagnosis of disease
4. Veniam is the winner of the major Portuguese Venture Competition Builidng Global Innovators
5. Male testosterone levels increase when victorious in competition against rivals, but not friends
6. FASEB announces BioArt image and video competition winners
7. Testosterone promotes reciprocity in the absence of competition
8. iGEM competition: First runner up to world champion for Bielefeld
9. Winners named in 2013 AAAS Kavli Science Journalism Awards competition
10. NERC announces the winner of its first photo and essay competition
11. AIBS announces winners of Faces of Biology photo competition
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/19/2014)... 2014   LaunchKey , the first decentralized mobile authentication ... of Things era, today announced the close of $3 ... led by Metamorphic Ventures with participation from ENIAC Ventures, ... others.  LaunchKey has raised $4 million to date, and ...
(Date:12/17/2014)... Va. , Dec. 15, 2014 The Defense ... easier to detect and prevent counterfeit microcircuits from entering ... started performing an in-house microcircuit anti-counterfeit initiative dubbed DNA ... microcircuits while increasing their reliability throughout the supply chain. ...
(Date:12/17/2014)... N.C. , Dec. 16, 2014 Valencell, a ... its PerformTek biometric technology to industry leaders such as ... accurate, clinically validated, biometric wearable products. These products will ... in Las Vegas . ...
Breaking Biology News(10 mins):LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 2LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 3Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 2Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 3Valencell PerformTek Biometrics Power the Most Accurate Wearables at CES 2015 2
... U.S. and China has produced a first draft of the ... percent of the plants gene coding sequence, sheds new light ... a genetically modified plant, the newly sequenced papaya genome offers ... make the plant resistant to the papaya ringspot virus. ...
... team of researchers at New York Medical College has ... is specialized to generate heat. A paper published April ... contains the surprising implication that the same lack of ... dinosaurs. , The paper, The brown adipocyte differentiation pathway ...
... western United States have found that the central Sierra ... ago, roughly 8 or 9 million years earlier than ... for understanding the geologic history of the mountain range ... global climate models that are currently being used strongly ...
Cached Biology News:First draft of transgenic papaya genome yields many fruits 2First draft of transgenic papaya genome yields many fruits 3Medical College researchers find dinosaur clues in fat 2Sierra Nevada rose to current height earlier than thought, say Stanford geologists 2Sierra Nevada rose to current height earlier than thought, say Stanford geologists 3Sierra Nevada rose to current height earlier than thought, say Stanford geologists 4
(Date:1/22/2015)...  Transwestern | RBJ today announces the firm brokered a long-term ... a leading biopharmaceutical company, at Two Ledgemont Center in ... Richards , president, and Brian Cohen , senior vice ... building at 95 Hayden Ave. Photo - ...
(Date:1/22/2015)... Protocol Networks brings independent technology consulting to ... independent consultants, Protocol Networks has recently announced its expansion ... years, his company has attracted several clients in The ... well as others. With the success of these engagements, ...
(Date:1/22/2015)... Controlled Substance Compliance Services (CSCS), a project ... the legal requirements around using controlled substances in pharmaceutical ... As their international operations expand and become increasingly complex, ... as a result of the first phase of the ...
(Date:1/22/2015)... ALTO, Calif. , Jan. 22. 2015  Varian Medical Systems ... and software, has been honored for its commitment to sustainability ... sustainable companies. Varian is the highest ranked healthcare equipment company ... announced today during the World Economic Forum at ...
Breaking Biology Technology:Transwestern | RBJ Advises Shire in 202,000 SF Lease, Creating Boston's Largest Suburban Biotech Campus 2Protocol Networks Brings Independent Technology Consulting to the Constitution State 2Global Compliance Service for Controlled Substances to Expand to China 2Varian Honored Among World's 100 Most Sustainable Corporations 2
... May 12 TorreyPines,Therapeutics, Inc. (Nasdaq: TPTX ) ... and audio webcast on Tuesday, May 13, 2008 at,11:00 ... of its,financial results for the first quarter ended March ... a.m. ET on Tuesday, May,13, 2008., To participate ...
... Completion honors Lilly,s commitment to the community and its biotech ... ... Lilly and Company,(NYSE: LLY ) announced today completion of the final ... and,development capabilities., At a ceremony at its Indianapolis operations, Lilly officials, ...
... launches in Atlanta and continues for 90 days;, Shire ... cities ... across the country, PHILADELPHIA, May ... company, today,announced the launch of a 13-city mobile screening initiative for ...
Cached Biology Technology:TorreyPines Therapeutics to Host First Quarter 2008 Results Conference Call and Webcast 2Lilly Completes Final Phase of Its Indianapolis Biotechnology Complex 2Lilly Completes Final Phase of Its Indianapolis Biotechnology Complex 3Shire Launches Nationwide Adult ADHD Mobile Awareness Tour 2Shire Launches Nationwide Adult ADHD Mobile Awareness Tour 3Shire Launches Nationwide Adult ADHD Mobile Awareness Tour 4Shire Launches Nationwide Adult ADHD Mobile Awareness Tour 5
8 different frozen tissues are mounted on positively charged glass slides...
... BioChain's monkey normal multiple tissue panels ... cellular localization of genes or proteins ... Tissues are mounted on positively charged ... are available in the identical format, ...
... T2-04 is an ultra-compact pump available in single ... and ideal for use in portable air and ... this pump works well in environments where DC ... compact size are critical., Offers ultra-compact size, ...
XA7 B6...
Biology Products: