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:8/6/2015)... JOSE, Calif. , Aug. 6, 2015 /PRNewswire/ ... leading developer of human interface solutions, today announced ... TouchPad technologies on Windows 10. Microsoft leveraged Synaptics, ... to the operating system. Through ... drivers are fully certified with Microsoft,s Precision TouchPad ...
(Date:8/4/2015)... Aug. 04, 2015 ... has announced the addition of the ... and Service), Sub-Segment (Computer Forensics, Network Forensics, ... Types, Service, Vertical and Region - Global ... offering. By Component (Hardware, Software, ...
(Date:7/31/2015)... julio de 2015 BGI llevará a cabo la ... 22 al 25 de octubre de 2015, en ... celebra su décimo aniversario este año. Desde su inauguración ... las reuniones anuales más influyentes del mundo en los ... conferencias científicas más dinámicas, entusiastas y amenas. ...
Breaking Biology News(10 mins):Synaptics Chosen for Human Interface Co-Development on Windows 10 2Digital Forensics Market - The Market Represents a Compound Annual Growth Rate (CAGR) of 11.3% From 2015 to 2020 2La 10ª Conferencia Internacional sobre Genómica (ICG-10) comienza en octubre 2La 10ª Conferencia Internacional sobre Genómica (ICG-10) comienza en octubre 3
... a molecule on the surface of B cells, a finding ... insidious attack on the immune system, University of Pittsburgh researchers ... , "The research supports a new role for B cells ... important implications for future studies and drug development efforts that ...
... "off" switch packaged in a tiny sphere penetrates deeply ... and drastically reducing the size of tumors, researchers at ... report in the Aug. 15 edition of Clinical Cancer ... cover of the journal, demonstrates a potent delivery system ...
... reported this week reveal that at least some primates can ... for guiding their foraging behavior when searching for ripening fruit. ... skills developed in humans and other primates, is reported by ... of St. Andrews in the June 20th issue of Current ...
Cached Biology News:HIV infection requires an accomplice: B cells with special protein direct HIV to T cells 2Fatty spheres loaded with siRNA shrink ovarian cancer tumors in preclinical trial 2Fatty spheres loaded with siRNA shrink ovarian cancer tumors in preclinical trial 3Primates take weather into account when searching for fruits 2
(Date:9/2/2015)... Israel , September 2, 2015 ... TASE: BOLT) ("BioLight" or the "Company"), a firm ... in ophthalmology and cancer diagnostics, announced today that ... of glaucoma will be delivered at the Ophthalmology ... the European Society of Cataract & Refractive Surgeons ...
(Date:9/2/2015)... ... September 02, 2015 , ... Temarry Recycling's new $100,000 waste ... energy process and continue to contribute to the sustainability of our natural resources. ... Energy process has been operating at their Mexico facility, Recicladora Temarry, for the ...
(Date:9/1/2015)... 2015 The American Brain Tumor Association (ABTA) ... Discovery Research Grant program. LOIs are due no later ... Discovery Grants are one-year, $50,000 grants that ... change current diagnostic or treatment paradigms for adults and ... research at its earliest stages, in the hopes that ...
(Date:9/1/2015)... ... 01, 2015 , ... AxioMx Inc. , a leader ... of Health (NIH) has awarded the company a Phase I Small Business Innovation ... of Diabetes and Digestive and Kidney Diseases. AxioMx will use this award to ...
Breaking Biology Technology:Presentations to Highlight BioLight's IOPtiMate[TM] System at Upcoming European Ophthalmology Conferences 2Presentations to Highlight BioLight's IOPtiMate[TM] System at Upcoming European Ophthalmology Conferences 3Temarry Recycling’s New $100,000 Waste to Energy Renovation 2American Brain Tumor Association Seeks Innovative Concepts For Discovery Research Grants 2AxioMx Announces Receipt of SBIR Grant for DNA-Protein Complex Antigen Development 2AxioMx Announces Receipt of SBIR Grant for DNA-Protein Complex Antigen Development 3
... , ... ... ... ...
... ... ... ... ...
... , ... for Rare Disease Day, hopes to bring more attention to the need for finding more ... ... hopes to draw more attention to the urgent need of finding more treatments for rare ...
Cached Biology Technology:Merck KGaA and Millipore Announce Transaction - Video Interview with Merck CEO 2Merck KGaA and Millipore Announce Transaction - Video Interview with Merck CEO 3Merck KGaA and Millipore Announce Transaction - Video Interview with Merck CEO 4Peer-reviewed Articles Further Define Clusterin and the Role of a Clusterin Inhibitor, OGX-011, for the Treatment of Cancer 2Peer-reviewed Articles Further Define Clusterin and the Role of a Clusterin Inhibitor, OGX-011, for the Treatment of Cancer 3Peer-reviewed Articles Further Define Clusterin and the Role of a Clusterin Inhibitor, OGX-011, for the Treatment of Cancer 4Peer-reviewed Articles Further Define Clusterin and the Role of a Clusterin Inhibitor, OGX-011, for the Treatment of Cancer 5Peer-reviewed Articles Further Define Clusterin and the Role of a Clusterin Inhibitor, OGX-011, for the Treatment of Cancer 6Peer-reviewed Articles Further Define Clusterin and the Role of a Clusterin Inhibitor, OGX-011, for the Treatment of Cancer 7Raising Awareness of Rare Diseases, Anson Group Announces Sponsorship of Rare Disease Day 2
...
... (For small quantities of solvents with DNA ... concentrator/centrifugal evaporator systems respond to specific applications ... and safe concentration of heat-labile samples. The ... different of cold traps and a wide ...
... 1 Block MBS Start up kit. Includes ... and choice of 1 MultiBlock satellite ... 30 blocks. User friendly software. ... Adjustable height heated lid. Outstanding uniformity. ...
The PxE Thermal Cycler (PxE) is a licensed 96 well PCR machine, developed to provide all fundamental features for value for money thermal cycling....
Biology Products: