Navigation Links
Present-day species of piranha result from a marine incursion into the Amazon Basin
Date:12/3/2007

Piranhas inhabit exclusively the fresh waters of South America. Their geographical distribution extends from the Orinoco River basin (Venezuela) to the North, down to that of the Paran (Argentina) to the South. Over this whole area, which also embraces the entire Amazon Basin, biologists have recorded 28 carnivorous species of these fish (2). In spite of the evolutionary success of this subfamily of fish, the mechanisms that generated the species richness of this group are still insufficiently known.

A team from the IRD, working in partnership with Bolivian and Peruvian scientists, aimed to establish how these species were able to evolve over the past 15 million years. They consequently took samples from around their whole distribution range. Between September 2002 and June 2003, numerous specimens of piranhas were collected from the Bolivian part of the Amazon. Complementary sampling was then conducted in the Brazilian and Peruvian sectors, from the Orinoco in Venezuela, and the So Francisco and the Paran-Paraguay in Brazil. The team selected 57 specimens representative of 21 different species of piranhas, from 15 collection points distributed over the whole South-American hydrographic network,.

Mitochondrial DNA (mtDNA) of piranhas has a particularly high mutation rate and thus could be used as a molecular basis for reconstructing the evolution of the present-day species which are different yet very close to one another. These techniques using mtDNA sequences led to the conclusion that the origin of the piranha species inhabiting the rivers of South America today dates back to some ancestor at only a few million years B.P. Yet dating from fossils, whose morphologies are strikingly similar to those of present-day piranhas, strongly suggests that this fish subfamily already existed in South Americas hydrographic system 25 million years ago. The modern species must therefore stem from a recent diversification.

Further investigation involving the c
'/>"/>

Contact: Gregory Flechet
fichesactu@paris.ird.fr
33-014-803-7607
Institut de Recherche Pour le Dveloppement
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. New continent and species discovered in Atlantic study
2. Emphasis on conifer forests places multiple species at risk
3. One species entire genome discovered inside anothers
4. How the plant immune system can drive the formation of new species
5. Student study bolsters case for adding a rare sunflower to the endangered species list
6. Ecologist finds dire devastation of snake species following floods of 93, 95
7. Smithsonian scientists help lead effort to barcode worlds species
8. Species still have more viable offspring if they can choose their best mate
9. Smithsonian identifies invasive crab species in Panama Canal expansion area
10. Smithsonian identifies invasive crab species in Panama Canal expansion area
11. New dinosaur species found in Montana
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/21/2014)... a previously unknown process for harvesting energy and producing ... Penn State University scientist has discovered. The discovery lays ... growth, harvesting energy from the Sun, and understanding dense ... other lakes worldwide. A paper describing the discovery will ... of the journal Science on 21 August ...
(Date:8/21/2014)... Nine researchers from Beth Israel Deaconess Medical Center ... "The World,s Most Influential Scientific Minds 2014," a ... ScienceWatch, a web resource for science metrics and research ... among the most influential "are performing and publishing work ... of their science," according to a Thomson Reuters statement. ...
(Date:8/21/2014)... recently published in the journal Carcinogenesis by ... role for the protein adenomatous polyposis coli (APC) in ... deaths in the U.S. , Lead author Kristi Neufeld, ... co-leader of the Cancer Biology program at the KU ... career trying to understand the various activities of APC, ...
Breaking Biology News(10 mins):Hot-spring bacteria reveal ability to use far-red light for photosynthesis 2Hot-spring bacteria reveal ability to use far-red light for photosynthesis 3BIDMC researchers named among 'the most influential scientific minds' 2BIDMC researchers named among 'the most influential scientific minds' 3Research offers insight into cellular biology of colorectal cancer 2Research offers insight into cellular biology of colorectal cancer 3
... discovery of a much sought after crack in the armor ... of the world,s population, causing stomach ulcers and other diseases. ... chemical pathway that the bacteria need for survival. Their study, ... these hard-to-treat microbes, is scheduled for the October 16 issue ...
... Exposure to radon gas in homes is the second leading ... carried out by researchers from the University of Cantabria and ... on exposure to this element in a uranium mining area ... Madrid. Numerous studies worldwide have shown that radon, a ...
... researchers at the University of California, Berkeley, has identified ... muscle. By manipulating these pathways, the researchers were able ... restoring its ability to repair and rebuild itself. ... issue of the journal EMBO Molecular Medicine , ...
Cached Biology News:Study in Spain and Romania confirms radon as second leading cause of lung cancer 2Study in Spain and Romania confirms radon as second leading cause of lung cancer 3Scientists discover clues to what makes human muscle age 2Scientists discover clues to what makes human muscle age 3Scientists discover clues to what makes human muscle age 4
(Date:8/21/2014)... , August 21, 2014 ... ) has announced the addition of the  ... to their offering.       (Logo: ... hormone therapy, is a means of replacing ... by the body. This type of therapy ...
(Date:8/21/2014)... BURLINGTON, Mass. , Aug. 21, 2014 /PRNewswire/ ... in Brazil and ... restrictions. The uptake of several newly approved agents, ... for this indication and the launch of emerging ... asthma markets. In particular, the emerging IL-5 inhibitors ...
(Date:8/21/2014)... VIEW, Calif. , Aug. 21, 2014 /PRNewswire/ ... properties and behaviors based on external stimuli such ... poised to have a disruptive effect in multiple ... revolutionize the business landscape by printing objects ranging ... aerospace and automotive sectors. Logo - ...
(Date:8/21/2014)... August 21, 2014 SoundConnect ... been recognized as one of the nation’s Fastest ... magazine for the 2nd consecutive year. Inc. magazine ... annual Inc. 500|5000, an exclusive ranking of the ... most comprehensive look at the most important segment ...
Breaking Biology Technology:Global Hormone Replacement Therapy Market 2014-2018: Key Vendors are Actavis, Bayer, Merck & Co, Novartis and Novo Nordisk 2Asthma Agents Currently Face a Suboptimal Coverage Environment in Brazil and Mexico, and as the Treatment Armamentarium Expands, Competitiveness Will Further Intensify 2Asthma Agents Currently Face a Suboptimal Coverage Environment in Brazil and Mexico, and as the Treatment Armamentarium Expands, Competitiveness Will Further Intensify 3Frost & Sullivan: 4-D Printing to Usher in Age of Low-Labor, Fast-Paced Product Manufacturing 2Frost & Sullivan: 4-D Printing to Usher in Age of Low-Labor, Fast-Paced Product Manufacturing 3Frost & Sullivan: 4-D Printing to Usher in Age of Low-Labor, Fast-Paced Product Manufacturing 4SoundConnect Returns on Inc. 5000 List of Fastest Growing Companies 2SoundConnect Returns on Inc. 5000 List of Fastest Growing Companies 3
... The National,Institutes of Allergy and Infectious Diseases ... Nordic to include the initiation of,a larger Phase ... in persons diagnosed with atopic dermatitis. The contract,extension ... has a value of,US$15 million, with the majority ...
... NEW YORK, Oct. 10 To mark 50 ... Disease Foundation,(PDF) will present an authoritative round-up of ... on Thursday, October 11 and Friday, October,12. The ... the latest news in Parkinson,s science and quality,of ...
... Paris: FR0005175080) announces that cash, cash equivalents and,short ... 30, 2007,compared to EUR 114.3 million at June ... nine months of 2007, cash, cash equivalents and ... was mainly due to,payments received from the partnership ...
Cached Biology Technology:Government Expands Trial With IMVAMUNE(R) Smallpox Vaccine in Persons With Atopic Dermatitis/Eczema 2Government Expands Trial With IMVAMUNE(R) Smallpox Vaccine in Persons With Atopic Dermatitis/Eczema 3The Parkinson's Disease Foundation Commemorates its 50th Anniversary with Special Scientific Symposium on Parkinson's Disease 2The Parkinson's Disease Foundation Commemorates its 50th Anniversary with Special Scientific Symposium on Parkinson's Disease 3
...
...
Kit for testing the ability of a compound to simulate lipolysis in cultured human adipocytes. Kit contains controls, buffers and reagents for detecting glycerol and non-esterified free fatty acids. A...
The strip cap tool is a used for properly seating 8- and 12-cap strips in microplates or strip tubes. A grooved channel on one side is designed to seat domed caps, while the flat edge on the opposite...
Biology Products: