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:4/17/2014)... Luca Razzari of the nergie Matriaux Tlcommunications Research ... the John R. Evans Leaders Fund of the ... of state-of-the-art biotech and nanophotonics equipment. To this ... Ministre de l,Enseignement suprieur, de la Recherche, de ... new laboratories will help us develop new approaches ...
(Date:4/17/2014)... . Our eyes ... us with a continuous stream of information about our own ... in a car the world glides by us and ... effort, our brain calculates self-motion from this "optic flow". This ... gaze during our own movements. Together with biologists from the ...
(Date:4/17/2014)... Calif. One day about eight years ago, ... California, Riverside, and her father were on a field trip ... upon an orchid they had never seen before. , Unable ... on orchids. The orchid turned out to be an ... Lophiaris silverarum . , "Lophiaris" is the genus name, ...
Breaking Biology News(10 mins):New state-of-the-art biotech and nanotech equipment for INRS 2How vision makes sure that little fish do not get carried away 2How vision makes sure that little fish do not get carried away 3How vision makes sure that little fish do not get carried away 4Orchid named after UC Riverside researcher 2Orchid named after UC Riverside researcher 3
... than 200 million people worldwide and is a ... Osteoporosis Foundation. Resistance training often is recommended to ... (BMD), although previous studies that examined the effects ... Now, in a new study, University of Missouri ...
... cells tighten their belts: they start to digest their ... as autophagy - takes place in special organelles called ... have developed as a means of survival when times ... has become a kind of self-cleaning process. In mammalian ...
... team at the Centre for Stem Cell Research in Cambridge ... http://dev.biologists.org/ ) a new and safer way of generating pluripotent ... to every tissue of the body. Rapid developments in stem ... stem cell scientists to convert specialised cells, such as skin ...
Cached Biology News:Building strong bones: Running may provide more benefits than resistance training, MU study finds 2Self-digestion as a means of survival 2Researchers piggyback to safer reprogrammed stem cells 2
(Date:1/15/2014)... SAN JOSE, California , January 15, 2014 ... antibody-drug conjugates for cancer, today announced the appointment of Thomas ... Reynolds has over 20 years, development experience gained in the ... Genetics. "I am delighted to welcome Tom at ...
(Date:1/15/2014)... More than 5 million Americans are currently living ... will die with Alzheimer’s or another dementia, according to ... many Americans into looking for ways to improve their ... cognitive disorders. Jonathan Weisman, president of Biohack Pure, is ...
(Date:1/15/2014)... 2014 2013 was a banner year ... Technologies®. They saw continued independent research led by the ... awarded a $1 million grant from the Susanne Marcus ... Behavior” a peer reviewed journal, Amy Grant highlighted Brainwave ...
(Date:1/14/2014)... Date: Friday, April 11, 2014 , Time: 6 p.m. – ... Warrington, Pa. , Details: The Hepatitis B Foundation, ... cure for hepatitis B and improving the quality of life ... on Friday, April 11 at Warrington Country Club in Warrington, ...
Breaking Biology Technology:Oxford BioTherapeutics Appoints Thomas C Reynolds MD, PhD to its Board of Directors 2Oxford BioTherapeutics Appoints Thomas C Reynolds MD, PhD to its Board of Directors 3Biohack Pure Offers 5 Tips for Increasing Memory in 2014 2Dynamic Innovative Technology Showcased at Scottsdale Company’s Open House 2Dynamic Innovative Technology Showcased at Scottsdale Company’s Open House 3Hepatitis B Foundation to Host Annual Crystal Ball Gala 2
... 2011 Sangui enters commercialization phase / Initial ... State of Tamaulipas has issued an initial order of Hemo2Spray, ... wound debridement product Scabremove both registered by the Mexican authorities ... order of the wound spray and Sangui management is positive ...
... and myeloma are both malignant diseases that arise from ... lymph nodes and the bone marrow. Although considerable progress ... they remain a significant challenge for patients and their ... for lymphoma and myeloma will be presented today at ...
... Corp. (NASDAQ: BSTC ), a biopharmaceutical company ... ® in the U.S. and XIAPEX ® ... George Gould, Esq., to its Board of Directors effective ... of George M. Gould, LLC, and of counsel to ...
Cached Biology Technology:Mexican State of Tamaulipas Starts Training Doctors in Sangui Wound Management 2Emerging Lymphoma and Myeloma Treatments Focus on Improving Individual Patient Response 2Emerging Lymphoma and Myeloma Treatments Focus on Improving Individual Patient Response 3Emerging Lymphoma and Myeloma Treatments Focus on Improving Individual Patient Response 4Emerging Lymphoma and Myeloma Treatments Focus on Improving Individual Patient Response 5Emerging Lymphoma and Myeloma Treatments Focus on Improving Individual Patient Response 6Emerging Lymphoma and Myeloma Treatments Focus on Improving Individual Patient Response 7Emerging Lymphoma and Myeloma Treatments Focus on Improving Individual Patient Response 8Emerging Lymphoma and Myeloma Treatments Focus on Improving Individual Patient Response 9BioSpecifics Technologies Corp. Announces Appointment of George Gould to Board of Directors 2BioSpecifics Technologies Corp. Announces Appointment of George Gould to Board of Directors 3BioSpecifics Technologies Corp. Announces Appointment of George Gould to Board of Directors 4
... The Jouan RC Maxi MB (for aqueous, ... vacuum concentrator/centrifugal evaporator systems respond to specific ... rapid and safe concentration of heat-labile samples. ... pumps, different of cold traps and a ...
... concentrator for efficient drying of small volumes ... system combines the SpeedVac™ Concentrator and chemically ... pump and rotor control, and dual timers ... time), makes the DNA120 indispensable in the ...
... Start up kit. Includes configured Laptop PC ... 1 MultiBlock satellite thermal Cycler (non-robotic). ... User friendly software. Store/track run data. ... lid. Outstanding uniformity. Advanced control ...
... Thermal Cycler is Thermo Electron's most advanced ... with easy to use sophisticated onboard software ... programming. Designed to offer performance, accuracy and ... a number of customer driven features built ...
Biology Products: