Navigation Links
Big brains are pricey, guppy study shows
Date:1/3/2013

Bigger brains can make animals, well, brainier, but that boost in brain size and ability comes at a price. That's according to new evidence reported on January 3rd in Current Biology, a Cell Press publication, in which researchers artificially selected guppies for large and small brain sizes.

The findings lend support to the notion that bigger brains and increased cognitive ability do go together, a topic that has been a matter of considerable debate in recent years, said Niclas Kolm of Uppsala University in Sweden. They also represent some of the first convincing evidence that large brains are expensive, evolutionarily speaking.

"We provide the first experimental evidence that evolving a larger brain really is costly in terms of both gut investment and, more importantly, reproductive output," Kolm said.

Together, the findings strongly support the idea that relative brain sizes among species are shaped through a balance between selection for increased cognitive ability and the costs of a big brain.

The results in guppies have important implications for us humans. After all, one of the most distinctive features of the human brain is its large size relative to the rest of the body.

"The human brain only makes up 2 percent of our total body mass but stands for 20 percent of our total energy demand," Kolm said. "It is a remarkably costly organ energetically."

But support for the so-called "expensive-tissue hypothesis"that there is a trade-off between the brain and the energy demands of other organs and reproductioncame only from comparative studies among species and were correlative in nature.

In the new study, Kolm's team took a different, within-species approach. They selected live-bearing guppies for large and small brains relative to the size of their bodies. Under that strong selection pressure, they found that brain size could evolve "remarkably quickly."

After selection, large-br
'/>"/>

Contact: Mary Beth O'Leary
moleary@cell.com
617-397-2802
Cell Press
Source:Eurekalert

Page: 1 2

Related biology news :

1. Musical duets lock brains as well as rhythms
2. Primates brains make visual maps using triangular grids
3. Preemies brains reap long-term benefits from Kangaroo Mother Care
4. Mice with big brains provide insight into brain regeneration and developmental disorders
5. University of Alberta led research may have discovered how memories are encoded in our brains
6. Hebrew University study finds key mechanism in calcium regulation
7. New study documents the natural relationship between CO2 concentrations and sea level
8. Stowers study hints that stem cells prepare for maturity much earlier than anticipated
9. Birdsong study pecks theory that music is uniquely human
10. Study turns parasite invasion theory on its head
11. Gout study offers genetic insight into disease of kings
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/17/2014)... one per eight hundred births, Down syndrome - or ... of intellectual disability. It results from a chromosomal abnormality ... of chromosome 21 (1% of the human genome). A ... the Department of Genetic Medicine and Development at the ... Nature , shed light on how the extra ...
(Date:4/17/2014)... years ago, Katia Silvera , a postdoctoral scholar at ... a field trip in a mountainous area in central Panama ... before. , Unable to identify it, they contacted German Carnevali, ... to be an unnamed species. So Carnevali recently named it ... the genus name, comprising about 40 species in the world. ...
(Date:4/17/2014)... deforestation and fragmentation of forests in the Amazon ... forests, contributing to rapid and widespread forest loss ... researchers., The findings show that forests in the ... droughts coupled with forest fires lead to large-scale ... Jennifer Balch, assistant professor of geography, Penn State. ...
Breaking Biology News(10 mins):Trisomy 21: How an extra little chromosome throws the entire genome off balance 2Trisomy 21: How an extra little chromosome throws the entire genome off balance 3Orchid named after UC Riverside researcher 2Orchid named after UC Riverside researcher 3Drought and fire in the Amazon lead to sharp increases in forest tree mortality 2Drought and fire in the Amazon lead to sharp increases in forest tree mortality 3
... University of Illinois have developed a new, more accurate ... that results from changes in land use. The ... Biology , takes into account many factors not included ... is an urgent need to accurately assess whether particular ...
... delivering oxygen to our vital organs are obstructed by atherosclerosis ... attack or damage to a peripheral tissue such as the ... injury or destruction from a choked-off blood supply varies from ... whose circulatory system has the best back-up plan to provide ...
... A Montreal study finds heterotrophic bacteria counts, in ... the recommended limits specified by the United States Pharmacopeia ... today at the 110th General Meeting of the American ... the cleanest tap water a large number of urban ...
Cached Biology News:Researchers calculate the greenhouse gas value of ecosystems 2Researchers calculate the greenhouse gas value of ecosystems 3Study pinpoints new role of molecule in the health of body's back-up blood circulation 2Study pinpoints new role of molecule in the health of body's back-up blood circulation 3Study pinpoints new role of molecule in the health of body's back-up blood circulation 4Study finds high level of bacteria in bottled water in Canada 2
(Date:1/15/2014)... (PRWEB) January 15, 2014 DTS Language ... its Online Web Portal for Life Science organizations who need ... specify the subject matter of their documents in advance with ... help reduce time-to-delivery of translations, often a critical factor in ...
(Date:1/15/2014)... TaiGen Biotechnology Company, Limited ("TaiGen") today announced that they ... Russian pharmaceutical company, to develop and commercialize nemonoxacin (Taigexyn ... , Turkey and other members ... antibiotic for the treatment of bacterial infections including those ...
(Date:1/14/2014)... Communications, a leading provider of strategic communications services to corporations and ... the United States and Europe ... JD, is returning to the firm,s Washington, D.C. ... more than two years of service as Associate Commissioner for the ...
(Date:1/14/2014)... BETHESDA, Md. , Jan. 14, 2014  Organovo ... institutes from the National Institutes of Health (NIH) to ... more effective treatments to patients on a faster timeline. ... Translational Sciences (NCATS) and the National Eye Institute (NEI) ...
Breaking Biology Technology:DTS Improves Efficiency for Life Science Document Translations 2TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 2TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 4Former FDA Associate Commissioner Returns To 3D Communications 2Organovo Announces Collaboration with National Institutes of Health 2Organovo Announces Collaboration with National Institutes of Health 3
... Jan. 26, 2012 Amgen (NASDAQ: AMGN ... today announced that the companies have entered into a ... a biotechnology company founded in Germany with its research ... Rockville, Md., for $11 per share in cash. The ...
... 2012 Sequenom, Inc. (NASDAQ: SQNM ) today ... shares of its common stock, including 1,950,000 shares sold pursuant ... to the underwriters. All of the shares were offered by ... share. The gross proceeds to Sequenom from this offering were ...
... Novartis Pharmaceuticals Corporation (NPC) and Sanford Wittels & Heisler, LLP, ... agreement to resolve the nationwide Wage and Hour class action ... the Southern District of New York.  NPC ... payment of up to 99 million dollars for eligible class ...
Cached Biology Technology:Amgen to Acquire Micromet 2Amgen to Acquire Micromet 3Amgen to Acquire Micromet 4Amgen to Acquire Micromet 5Amgen to Acquire Micromet 6Amgen to Acquire Micromet 7Amgen to Acquire Micromet 8Amgen to Acquire Micromet 9Sequenom Announces Exercise in Full of Over-Allotment Option and Completion of Public Offering of Common Stock 2Sequenom Announces Exercise in Full of Over-Allotment Option and Completion of Public Offering of Common Stock 3Plaintiff Sales Representatives and Novartis Pharmaceuticals Corporation Resolve Class Action Wage and Hour Claims 2Plaintiff Sales Representatives and Novartis Pharmaceuticals Corporation Resolve Class Action Wage and Hour Claims 3Plaintiff Sales Representatives and Novartis Pharmaceuticals Corporation Resolve Class Action Wage and Hour Claims 4
... allows the Thermo-Fast® 96 ... PCR plates to be ... PRISM® 3700 capillary sequencer. ... information on the software ...
... • Heat activated ,• ... room temperature ,• Excellent specificity allows ... and secondary structures ,• Leaves an ... chemically modified form of GeneChoice DNA Polymerase ...
... aqueous solution. Cleaves a-(1-3)- ... carbohydrates and glycoproteins. It is particularly efficient ... the pH must be neutral or above, ... Unit Definition: One unit will ...
This adapter allows the Thermo-Fast® 96 Semi-Skirted (AB-0900 and AB-0990) PCR plates to be used directly in the ABI PRISM® 3100 sequencer without the need for software changes....
Biology Products: