Navigation Links
Fluctuating environment may have driven human evolution
Date:12/24/2012

rchers -- including Gail Ashley, professor of earth and planetary sciences, Rutgers University -- examined lake sediments from Olduvai Gorge in northern Tanzania. They removed the organic matter that had either washed or was blown into the lake from the surrounding vegetation, microbes and other organisms 2 million years ago from the sediments. In particular, they looked at biomarkers -- fossil molecules from ancient organisms -- from the waxy coating on plant leaves.

"We looked at leaf waxes because they're tough, they survive well in the sediment," said Freeman.

The team used gas chromatography and mass spectrometry to determine the relative abundances of different leaf waxes and the abundance of carbon isotopes for different leaf waxes. The data enabled them to reconstruct the types of vegetation present in the Olduvai Gorge area at very specific time intervals.

The results showed that the environment transitioned rapidly back and forth between a closed woodland and an open grassland.

To find out what caused this rapid transitioning, the researchers used statistical and mathematical models to correlate the changes they saw in the environment with other things that may have been happening at the time, including changes in the Earth's movement and changes in sea-surface temperatures.

"The orbit of the Earth around the sun slowly changes with time," said Freeman. "These changes were tied to the local climate at Olduvai Gorge through changes in the monsoon system in Africa. Slight changes in the amount of sunshine changed the intensity of atmospheric circulation and the supply of water. The rain patterns that drive the plant patterns follow this monsoon circulation. We found a correlation between changes in the environment and planetary movement."

The team also found a correlation between changes in the environment and sea-surface temperature in the tropics.

"We find complementary forcing mechanisms: one is the way Earth orbits,
'/>"/>

Contact: Sara LaJeunesse
SDL13@psu.edu
814-863-4325
Penn State
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Environmental threat map highlights Great Lakes restoration challenges
2. Farm soil determines environmental fate of phosphorous
3. Association of Environmental Engineering and Science Professors name Environmental Engineering Science as its official journal
4. Prickly holly reveals ability to adapt genetics to environmental change
5. Messages that speak to conservatives morals narrow partisan gap on environment
6. Conservatives can be persuaded to care more about the environment
7. Environmental chemical blocks cell function
8. Fracking in Michigan: U-M researchers study potential impact on health, environment, economy
9. Bioengineered marine algae expands environments where biofuels can be produced
10. Devotes, a project to investigate marine biodiversity and the environment of European seas
11. Southampton to help develop new crops for water-stressed environments
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Fluctuating environment may have driven human evolution
(Date:11/4/2014)... November 4, 2014   ... growth   Fuel3D , a developer of ... funding round totaling $6.4 million (£4 million). This funding builds ... earlier this year and paves the way for the commercial ... The funding round was led by Chimera Partners and ...
(Date:11/3/2014)... , Nov. 3, 2014 Research and ... "Cell Therapy - Technologies, Markets and Companies" to ... cell therapy technologies and methods, which have already started to ... stem cell transplantation is replacing the old fashioned bone marrow ... Cell therapy is bound to become a part of medical ...
(Date:11/3/2014)... and preterm birth are linked to increased risk for ... the American College of Rheumatology (ACR) journal, Arthritis ... and pre-term babies were not at greater risk of ... According to the ACR, 27 million Americans over the ... of OA range from mild to severe and include ...
Breaking Biology News(10 mins):Fuel3D Secures $6.4 Million in Expansion Funding 2Fuel3D Secures $6.4 Million in Expansion Funding 3Global Cell Therapy - Technologies, Markets and Companies: 2014 Report 2Global Cell Therapy - Technologies, Markets and Companies: 2014 Report 3Preterm, low birth-weight babies may need new hips in adulthood 2
... fuel sources are lighting a fire under research to turn ... Bill 20, signed this week by Gov. Rick Perry, compliments ... used. The new law requires more renewable energy to be ... consumer energy needs and agriculture industry trends with the legislation ...
... some day be defeated by a single treatment, according ... University of Georgia's College of Veterinary Medicine. , Their ... and Marburg and includes investigators from Vanderbilt University Medical ... The study is being funded by a grant from ...
... Berkeley, has found that damage to a cell's DNA sets ... of a marker recognized by the body's immune system. , ... advanced online issue of Nature, shed light on a long-standing ... are able to attack tumors - can differentiate cells that ...
Cached Biology News:Researchers find ways to turn manure into power 2Researchers find ways to turn manure into power 3Researcher at UGA College of Veterinary Medicine identifies new way of combating viral diseases 2New study finds how cells with damaged DNA alert the immune system 2New study finds how cells with damaged DNA alert the immune system 3
(Date:11/22/2014)... RURO, Inc., a leading LIMS, RFID ... version 5.1.4. , RURO’s deployment teams have been ... in RURO’s 8 year history. Many deployments have ... version 5.1.4 is the perfect example – the ... , Limfinity® 5.1.4 release highlights – more than ...
(Date:11/22/2014)... Quebec , November 21, 2014 ... wechselt als Chief Commercial Officer zu KLOX ... SVP der Unternehmensentwicklung und Chief Financial Officer bestellt    ... Europa mit der Vermarktung seines jüngst zugelassenen Behandlungssystems zur ... Inc. ("KLOX" bzw. das "Unternehmen") ist sehr erfreut, die ...
(Date:11/21/2014)... 20, 2014 Author Matthew J. Pallamary’s ... the Other Side” published as a tribute to ... the “Fiction: Short Story” category of the 2014 ... and CEO of USA Book News, said this year’s ... publishers, including Simon & Schuster, Penguin, John Wiley & ...
(Date:11/21/2014)... 2014 Why did Stephen Hawking become ... so instantly recognizable? Why have they become icons to ... author Hilton Ratcliffe seeks out the answers to those ... to do with science. In " Stephen Hawking Smoked ... 21, 2014), Ratcliffe puts it plainly: , “It ...
Breaking Biology Technology:RURO Announces Limfinity® version 5.1.4 2KLOX Technologies meldet Neubesetzung von Führungspositionen 2KLOX Technologies meldet Neubesetzung von Führungspositionen 3KLOX Technologies meldet Neubesetzung von Führungspositionen 4KLOX Technologies meldet Neubesetzung von Führungspositionen 5Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 2Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 3Mystic Ink 's Short Story Collection “A Short Walk to the Other Side” Honoring Ray Bradbury Praised As Award-Winning Finalist In USA Best Book Awards 4“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 2“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 3“Stephen Hawking Smoked My Socks” Sparks Controversy in Science World 4
... Del., July 13 ParagonRx, a Delaware-based company which specializes in ... website - www.paragonrx.com - that includes a ... in complying with new FDA requirements to ensure the medical benefits ... , "REMS, or Risk Evaluation and ...
... , NEWARK, N.J., July 13 ... technology-based Life Science company announced today that at ATS Labs using ... Ygiene(TM) formula produced a 100% Total Kill of ... required AOAC Sporicidal Test utilizing spore impregnated then knotted suture loops ...
... , HOLMDEL, N.J., July 13 ... quality and compliance management software, today announced that ... products, has deployed Sparta,s TrackWise ((R)) Enterprise Quality ... across its manufacturing operations in Canada and the United ...
Cached Biology Technology:ParagonRx Creates New Website Featuring REMS Help Center for Pharma 2BioNeutral's Ygiene(TM) Hospital Grade Achieves World Class Independent Test Results in Killing Life Threatening Spores/Organisms 2BioNeutral's Ygiene(TM) Hospital Grade Achieves World Class Independent Test Results in Killing Life Threatening Spores/Organisms 3BioNeutral's Ygiene(TM) Hospital Grade Achieves World Class Independent Test Results in Killing Life Threatening Spores/Organisms 4Sparta Systems' TrackWise(R) Solution Delivers Workforce Training and Learning Initiatives for Cangene Corporation 2Sparta Systems' TrackWise(R) Solution Delivers Workforce Training and Learning Initiatives for Cangene Corporation 3Sparta Systems' TrackWise(R) Solution Delivers Workforce Training and Learning Initiatives for Cangene Corporation 4
... spatulas have been designed to save time ... those interested in eliminating the recycling and ... is individually packaged, RNase/DNase free, non-pyrogenic and ... new product number, created to easily match ...
... mechanical harvesting of cells • Blade design ... with the growth surface • Designed for ... Individually wrapped • Sterilized by gamma radiation ... is a new product number, created to ...
... kit for a single fragment based screening project: , ... , 96 shape-diverse mixtures of 4 (5 ... files for structure refinement , Individual compounds ... are at ca. 50 mM. Supplied in 5 96-well trays. ...
... interferons are cytopathic effect inhibition assays, also ... The neutralization assay measures the antibody's ability ... cytokine. Sample types include; tissue culture supernatents; ... assays, one unit is defined as the ...
Biology Products: