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:3/10/2015)... , March 10, 2015  NXT-ID, Inc. (NASDAQ: ... the "Company"), a biometric authentication company focused on ... Wocket™ smart wallet has been named the "Number ... Modern. Rethink Modern ( http://www.rethinkmodern.com/ ) ... for your home and lifestyle that have a unique ...
(Date:3/3/2015)... Calif. , March 3, 2015 /PRNewswire/ ... leading provider of advanced cryogenic logistics solutions ... including immunotherapies, stem cells, cell lines, clinical ... reproductive medicine, today announced the expansion of ... Research Centers, ("Fred Hutch") Clinical Research ...
(Date:3/2/2015)...   Neurotechnology , a provider of high-precision biometric, ... Software Development Kit (SDK). The SentiGaze algorithm enables ... webcams to track eye movements and generate heatmaps based ... can be used for applications such as analysis of ... SDK can also be used to develop interfaces for ...
Breaking Biology News(10 mins):NXT-ID's Wocket Smart Wallet Named Number One Best Tech Gift for 2015 by Rethink Modern 2NXT-ID's Wocket Smart Wallet Named Number One Best Tech Gift for 2015 by Rethink Modern 3NXT-ID's Wocket Smart Wallet Named Number One Best Tech Gift for 2015 by Rethink Modern 4Cryoport, Inc. Expands Support of Fred Hutchinson Cancer Research Center's Clinical Research Division 2Cryoport, Inc. Expands Support of Fred Hutchinson Cancer Research Center's Clinical Research Division 3Neurotechnology Releases SentiGaze SDK for Eye Movement Tracking Using Ordinary Webcams 2Neurotechnology Releases SentiGaze SDK for Eye Movement Tracking Using Ordinary Webcams 3
... --- How do the French get away with a clean ... fats? Scientists have long suspected that the answer to the ... of a new study bring them closer to understanding why. ... Public Library of Science (PLoS) ONE, researchers from industry and ...
... York next week to discuss new approaches to one ... weather. Five years ago, Professor Peter Bernath, of ... the Atmospheric Chemistry Experiment (ACE) satellite mission. To ... University at the King,s Manor in York will review ...
... release is available in German . ... cormorants in order to reconcile nature conservation and fishing ... work at the European level, researchers from the Helmholtz ... journal Environmental Conservation. Furthermore, they suggest a five-step action ...
Cached Biology News:Substance in red wine found to keep hearts young 2Substance in red wine found to keep hearts young 3York symposium puts focus on chemical 'weather' 2The cormorant -- the 'black plague' or an example of successful species conservation? 2The cormorant -- the 'black plague' or an example of successful species conservation? 3The cormorant -- the 'black plague' or an example of successful species conservation? 4The cormorant -- the 'black plague' or an example of successful species conservation? 5
(Date:3/26/2015)... 2015 Neogen Corporation (NASDAQ: NEOG ) ... quarter of fiscal 2015, which ended Feb. 28, increased ... $6,575,000. Earnings per share in the current quarter were ... net income increased 17% over prior year to $24,142,000, ... per share, for the same period a year ago. ...
(Date:3/26/2015)... 26, 2015 WriteResult, a premier provider ... from Yale University’s School of Public Health and New ... during a 4 month-long project. The goal of the ... income families with free access to fresh produce and ... health concerns like high blood pressure, diabetes and weight ...
(Date:3/25/2015)... 2015 The surging prevalence of ... fuelled social media growth, with over 50% of ... social networking. Insurance companies are making use of ... and promote a diversity of their services and ... exploiting social networking services as part of sales ...
(Date:3/25/2015)... (PRWEB) March 25, 2015 An increase ... ingredients in all forms of food nutrients, regulatory changes ... a substantial rise in demand for natural astaxanthin over ... started to ramp up their capacities to satisfy the ... natural and synthetic source astaxanthin (used in nutraceuticals, aqua ...
Breaking Biology Technology:Neogen reports 13% increase in net income 2Neogen reports 13% increase in net income 3Neogen reports 13% increase in net income 4Neogen reports 13% increase in net income 5Neogen reports 13% increase in net income 6Neogen reports 13% increase in net income 7Neogen reports 13% increase in net income 8Yale and New Haven Farms Improving Patient Health with WriteResult's myPROpad™ 2Yale and New Haven Farms Improving Patient Health with WriteResult's myPROpad™ 3Social Media Role in Global Insurance Industry Examined by Timetric in New Market Research Report Published at MarketPublishers.com 2Social Media Role in Global Insurance Industry Examined by Timetric in New Market Research Report Published at MarketPublishers.com 3Global Astaxanthin Market to Reach Value of USD 1.1 billion by 2020, Expects Industry Experts in New Report Available at MarketPublishers.com 2
... measures urinary 11dhTxB2 to assess aspirin effectDENVER, March ... CONX), a worldwide developer and marketer of diagnostic ... its AspirinWorks(R) Test March 29 - 31 at ... Scientific Session. The annual meeting will take place ...
... regulatory hiccups, the number of biosimilars in the ... patent expiry of key biopharmaceuticals has opened up ... of biosimilars. In addition, payers, perception of biosimilars, ... their safety, efficacy and affordability, will further bolster ...
... 18 , - ... and Compliance Challenges of Radiologic Technologists, Managers , ... Mosby,s Imaging Suite,( http://www.mosbysimagingsuite.com ), the first fully ... education, communication and,compliance challenges of radiologic technologists and ...
Cached Biology Technology:Corgenix to Exhibit AspirinWorks(R) Test at ACC.09 2Corgenix to Exhibit AspirinWorks(R) Test at ACC.09 3The Need for Safe and Affordable Biopharmaceuticals Drives the Development of the European Biosimilars Market, Says Frost & Sullivan 2The Need for Safe and Affordable Biopharmaceuticals Drives the Development of the European Biosimilars Market, Says Frost & Sullivan 3The Need for Safe and Affordable Biopharmaceuticals Drives the Development of the European Biosimilars Market, Says Frost & Sullivan 4New Online Imaging Suite Boosts Healthcare Imaging Efficiency, Productivity, and Revenues 2New Online Imaging Suite Boosts Healthcare Imaging Efficiency, Productivity, and Revenues 3New Online Imaging Suite Boosts Healthcare Imaging Efficiency, Productivity, and Revenues 4
Cytofix/Cytoperm Plus Kit with GolgiPlug 250 Tests...
Complete PCR kit. Includes: MasterAmp™ Taq DNA Polymerase, 10X PCR Buffer, MasterAmp™ 10X PCR Enhancer, dNTP Mix, 2.5 mM each, 25 mM MgCl2, Enzyme Dilution Buffer, Control Template and Prim...
Mouse monoclonal to OCIL ( Abpromise for all tested applications)....
Oxidative Stress-Inducible Protein Tyrosine Phosphatase...
Biology Products: