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

, these piranhas could finally have dispersed downstream, finding their way back to the Amazons lowland plain which would have served as a gathering ground for biodiversity. What now remains to be found are the ecological parameters that could have favoured the diversification of piranha populations so confined to the upper reaches of the river network.

One of the hypotheses advanced highlights water quality as a factor in stimulating ecological and morphological differentiation of species. The field survey observations indicated that some of the species were highly localized, in both geographical and ecological terms. For example, Serrasalmus hollandi is mostly found in turbid, sediment-laden waters flowing down from Andean mountain streams. In contrast, a new species the biologists discovered, lives in the same hydrographic basin but only in rivers with crystal-clear waters bearing very little sediment content.

However, water quality cannot be considered as the sole factor behind speciation, seeing that a third piranha species was found living in either of these two categories of river. The research results as a whole suggest that the superimposition of factors linked to geographical history and ecological conditions, intervening at different spatial and temporal scales, is responsible for the diversification of the piranhas. This is an evolutionary progression which should be transposable to other fish communities inhabiting South American waters.


'/>"/>

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:9/29/2014)... at home should use ventilation when cooking with a ... after a new study showed an association between gas ... bronchitis. , "In homes where a gas stove was ... is higher than in homes where a gas stove ... professor in the College of Public Health and Human ...
(Date:9/29/2014)... Scientists at Washington State University have concluded that ... apples may help prevent disorders associated with ... to assess these compounds in apple cultivars grown ... edition of the journal Food Chemistry ., ... good source of these nondigestible compounds but there ...
(Date:9/29/2014)... in Behavioral Brain Research provides novel insight ... result of chronic alcohol exposure that can lead to ... and research indicate that individuals with alcohol use disorders ... when people are actively drinking, when they are going ... "Sleep-wake disturbances can last for months, or even years, ...
Breaking Biology News(10 mins):Childhood asthma linked to lack of ventilation for gas stoves, OSU study shows 2Childhood asthma linked to lack of ventilation for gas stoves, OSU study shows 3An apple a day could keep obesity away 2
... Using a systems biological analysis of genome-scale data ... of researchers identified that the master gene controlling ... The study will appear in the latest issue ... Sciences. This hypothesis derived from multi-network analysis of ...
... led by Mark Hoddle , a biological control ... glassy-winged sharpshooter , a major agricultural pest, from the ... in the South Pacific Ocean. To achieve total pest ... that provides permanent control and can be applied to ...
... MANHATTAN, KAN. -- To understand how nitrogen accumulates in large ... Dodds looked at small streams flowing closer to home. ... have to look any farther than his own campus for ... nine small waterways in the Manhattan area that Dodds used ...
Cached Biology News:Systems biology approach identifies nutrient regulation of biological clock in plants 2UCR-led research team uses tiny wasp to wipe out major agricultural pest in Tahiti 2UCR-led research team uses tiny wasp to wipe out major agricultural pest in Tahiti 3UCR-led research team uses tiny wasp to wipe out major agricultural pest in Tahiti 4Research team finds that microorganisms filter nitrogen from small streams 2
(Date:9/30/2014)... Windsor, CT (PRWEB) September 30, 2014 ... distributor of scientific research products, recently opened an ... its comprehensive cell culture product lines developed and ... through its online store include Biological Industries’ Nutristem® ... (hMSC) and human embryonic stem cell (hESC) culture. ...
(Date:9/30/2014)... 30, 2014 UFP Technologies, a ... packaging has recently introduced a custom insulated shipping ... . The new insulated shipper solves the issue ... process. UFP Technologies’ BioShell is a universal storage ... storage, handling and shipping. The insulated shipper keeps ...
(Date:9/30/2014)... (PRWEB) September 30, 2014 Back in the ... 500 square feet. per employee, which included space for circulation ... then.” says Jeff Howell, partner at Nidea Corporate Real ... in Toronto. “By the year 2000, however, 250 square ... seeing that number come down to 175 to 225 square ...
(Date:9/29/2014)... (PRWEB) September 30, 2014 Each ... burn injuries require medical attention. In the military, ... serious complications to battlefield medical care. More than ... and Afghanistan. Burn wounds heal slowly, remain inflamed ... be excessive, physically debilitating and functionally damaging. While ...
Breaking Biology Technology:Rainbow Scientific, Inc. opens online store for state-of-the-art stem cell culture and cytogenetic reagents 2UFP Technologies Introduces Insulated Shipping Container For Bulk Drug Transportation 2UFP Technologies Introduces Insulated Shipping Container For Bulk Drug Transportation 3ITRA Global Reports on How Companies Are Squeezing More Employees into Less Office Space 2ITRA Global Reports on How Companies Are Squeezing More Employees into Less Office Space 3Faster Healing with Fewer Scars 2
... up by 48% at EUR958 Million - EBITDA Margin ... the Target Segment of Pharmaceutical Plastics,in South America: Brazilian ... to provisional figures, Gerresheimer AG has just completed,another record ... up by,48.1%; the adjusted Group EBITDA margin reached 19%. ...
... think a lot about "Homeland Security," but one Montana ... home gardeners also serves to keep us safe from ... the Bozeman campus recently received a five-year grant for ... the lab provides an early warning system of biological ...
... manufactured product our clothes, money, appliances, the paint ... cars will be embedded with intelligence, networks of ... dust or an Internet of Things. The world of ... have surveillance systems, biometrics, personal communicators, machine learning and ...
Cached Biology Technology:2007 Another Record Year in Terms of Sales and Earnings for Gerresheimer 22007 Another Record Year in Terms of Sales and Earnings for Gerresheimer 3Montana State University lab gives early warnings about biological invaders 2Montana State University lab gives early warnings about biological invaders 3Supportive devices or unnecessary surveillance? 2
... Peptide Antigen Design , Customer Peptide Synthesis , ... purity above 90%, 20 mg will be returned to customer conjugation ... 2, , Maintenance 102 days/each ... injections x5 /each , Test bleed (app. ...
...
GeneRacer is an advanced RACE (rapid amplification of cDNA ends) technique that improves the efficiency of amplifying full-length 5' and 3' cDNA ends. With the GeneRacer Kit you can:...
One-step, microplate or cuvet, colorimetric, linear detection range 0.6 mM to 100 mM. Procedure: 2 min....
Biology Products: