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:7/30/2014)... Press (OUP) is pleased to announce its new relationship ... 2015, OUP and CINP will partner to publish ... a fully open-access journal. , Alan Frazer, Editor-in-Chief of ... size and expertise of OUP will further facilitate the ... of the very leading journals within neuropsychopharmacology. The conversion ...
(Date:7/30/2014)... of $1 million from the Cornelia Cogswell Rossi Foundation ... Center. , The newly established Connie Cogswell ... develop a greater breadth and depth of knowledge of ... pace of research to improve human health. , The ... the Laboratory and its external partners, supporting research to ...
(Date:7/30/2014)... from HIV infection could be as simple as inserting ... , University of Washington bioengineers have discovered a potentially ... women from contracting HIV. Their method spins the drug ... with moisture, releasing higher doses of the drug than ... creams. , "This could offer women a potentially more ...
Breaking Biology News(10 mins):OUP to partner with the International College of Neuropsychopharmacology 2Rossi Foundation pledges $1M for JAX neurobehavioral research center 2Dissolvable fabric loaded with medicine might offer faster protection against HIV 2Dissolvable fabric loaded with medicine might offer faster protection against HIV 3
... not always show it, but people are rarely born with ... and legs to grow in the right places and point ... between our fingers and toes and every other formative detail ... to construct and position our limbs were being perfected more ...
... one strain of an infectious disease can exist at ... in the August issue of The American Naturalist, Ken ... mathematical model to help explain multiple strains, showing that ... that the coexistence of multiple infectious disease strains result ...
... could peer microscopically into the closest freshwater pond, you'd ... you'd probably notice an oddly furry, pear-shaped organism gliding ... This tiny predator has a big name-- Tetrahymena thermophila ... star organism for research into how cells work. , ...
Cached Biology News:UF scientists discover evolutionary origin of fins, limbs 2UF scientists discover evolutionary origin of fins, limbs 3What's shaped like a pear and has 2 genomes? Check the pond 2What's shaped like a pear and has 2 genomes? Check the pond 3
(Date:7/31/2014)... SoundConnect , an award winning ... to announce the addition of Adobe Connects Learning ... tools to quickly deploy and manage online courses ... for desktop and mobile learning solutions. , Adobe ... online training solution, enabling organizations to deploy, measure, ...
(Date:7/30/2014)... and PARIS , July 30, 2014 ... SAN and NYSE: SNY) today announced that the Companies ... (FDA) rare pediatric disease priority review voucher in connection ...  The priority review voucher entitles the holder to designate ... expedited 6-month review from the filing date instead of ...
(Date:7/30/2014)... 2014  Replikins Ltd. today released new data on ... Before the current outbreaks, the mean Ebola Reston gene ... between 1995 and 2002 was 1.1; the mean Replikin ... sixteen-fold in 2013, thus predicting the current outbreaks in ... been shown to be able to predict outbreaks (1). ...
(Date:7/30/2014)... 30, 2014 With the accelerated ... personal health expenditure as well as the improved ... China diagnostic reagent industry has been developing quickly, ... In 2013, Chinese in vitro diagnostics market size ... from in vitro diagnostic reagents. , Read ...
Breaking Biology Technology:SoundConnect Enhances Portfolio with Adobe Connect Learning Management System (LMS) 2Regeneron and Sanofi Announce Plan to Use Priority Review Voucher For Alirocumab U.S. FDA Submission 2Regeneron and Sanofi Announce Plan to Use Priority Review Voucher For Alirocumab U.S. FDA Submission 3Regeneron and Sanofi Announce Plan to Use Priority Review Voucher For Alirocumab U.S. FDA Submission 4Regeneron and Sanofi Announce Plan to Use Priority Review Voucher For Alirocumab U.S. FDA Submission 5Regeneron and Sanofi Announce Plan to Use Priority Review Voucher For Alirocumab U.S. FDA Submission 6China Diagnostic Reagent Industry Report, 2013-2016 | Researchmoz 2China Diagnostic Reagent Industry Report, 2013-2016 | Researchmoz 3
... call for making available more detailed maps of the locations ... crops on a county and township level will give researchers ... wildlife, water quality, and on pest and beneficial insects. ... been planted with biotech crops in the U.S.," said Michelle ...
... Corporation, an advanced,biomaterials company, announced today that ... AlloSource., (Logo: http://www.newscom.com/cgi-bin/prnh/20080424/NETH117LOGO ), ... Bone Matrix (DBM),powder to be mixed with ... form EquivaBone(TM)., This agreement is consistent ...
... 24 Idenix,Pharmaceuticals, Inc. (Nasdaq: IDIX ) ... overview at the upcoming Morgan Stanley Global,Healthcare Unplugged ... p.m.,ET at The Ritz Carlton in Key Biscayne, ... the company presentation can be,accessed under "Calendar of ...
Cached Biology Technology:Scientists call for more access to biotech crop data 2ETEX Announces Supply Agreement with AlloSource 2