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 that it provides experimental evidence that competition for space drives differential mating in cichlid fish and, in time, leads to the formation of new species. Nature has its ways from body size differences to the formation of new species. And clearly, size does matters for Telmatochromis and for fish diversity."


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

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:4/13/2017)... April 13, 2017 According to a new market ... Identity Analytics, Identity Administration, and Authorization), Service, Authentication Type, Deployment Mode, Vertical, ... Market is expected to grow from USD 14.30 Billion in 2017 to ... of 17.3%. ... MarketsandMarkets Logo ...
(Date:4/11/2017)... -- NXT-ID, Inc. (NASDAQ:   NXTD ) ("NXT-ID" ... of independent Directors Mr. Robin D. Richards and ... furthering the company,s corporate governance and expertise. ... Gino Pereira , Chief Executive Officer ... guidance and benefiting from their considerable expertise as we move ...
(Date:4/5/2017)... 4, 2017 KEY FINDINGS The ... at a CAGR of 25.76% during the forecast period ... primary factor for the growth of the stem cell ... MARKET INSIGHTS The global stem cell market ... and geography. The stem cell market of the product ...
Breaking Biology News(10 mins):
(Date:5/18/2017)... ... May 17, 2017 , ... USDM ... firm for the life sciences and healthcare industries, is honored that Jay ... Medical Devices conference in Brussels, Belgium. , Crowley played a crucial role in ...
(Date:5/18/2017)... (PRWEB) , ... May 17, 2017 , ... ... construction, announced today that their Chief Executive Officer, Maik Jornitz, was recognized as ... UK publication’s Power List celebrates 100 individuals “involved in bettering the pharma industry ...
(Date:5/18/2017)... Boston, MA (PRWEB) , ... May 18, 2017 , ... When James Sherley, was notified ... the 50 Most Valuable Brands for the Year 2017 by The Silicon Review , ... had been making good progress increasing Asymmetrex’s value, but this recognition by Silicon Valley was ...
(Date:5/16/2017)... ... May 16, 2017 , ... ... its new ProxiMeta™ Hi-C metagenomic deconvolution service. ProxiMeta enables researchers to obtain ... DNA extraction—speeding research insights at lower cost. , “We’re very excited about ...
Breaking Biology Technology: