Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Stratified seawater disrupts the transport of imposex substances

25.01.2002


Researchers from the University of Amsterdam have demonstrated that the climate in South Mexico changed following the collapse of the Maya empire. From preserved pollen grains the paleoecologists could deduce that the climate quickly became dryer.


The climate becoming dryer, explains the decrease in the population following the collapse of the Maya empire. The climate researchers have therefore helped to solve an archaeological mystery.

With the help of pollen grains, the paleoecologists from Amsterdam could accurately reconstruct the climate in a certain region. Each plant will only grow under certain conditions. By working out the overlap between the possible growth conditions for each plant in an area, an accurate picture of the local climate can be constructed.

In the area inhabited by the Mayas, Southern Mexico and Northern Guatemala, the researchers found that round about 1000 AD the climate quickly became dryer. This was about 100 years after the collapse of the Maya empire. The researchers suspect that after the collapse of the well-organised empire, the inhabitants destroyed many wildlife and agricultural areas. This led to erosion, as a result of which the evaporation, and thus the rainfall, decreased.



The pollen grains also provided information about farming in the distant past. In Peru the paleoecologists could reconstruct how the cultivation of maize and grain crops spread over various population groups. Certain population groups who lived as hunters and gatherers when the Spaniards arrived, were revealed to have a rich agricultural past.
The pollen research in South and Central America has also provided data that are important for current climate research. In an elevated area in Colombia, pollen grains were found from the last three million years. The paleoecologists examined which plants grew at various carbon dioxide concentrations in the atmosphere over the past 450,000 years. The carbon dioxide concentration in the air for this period is known, thanks to the discovery of frozen air bubbles in ice at the South Pole. The comparison revealed that in the past, plant growth was strongly correlated with carbon dioxide concentrations. The analyses revealed that not only the temperature changed but also the precipitation and the season in which this fell.

Michel Philippens | alphagalileo

More articles from Interdisciplinary Research:

nachricht Fighting myocardial infarction with nanoparticle tandems
04.12.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn

nachricht Virtual Reality for Bacteria
01.12.2017 | Institute of Science and Technology Austria

All articles from Interdisciplinary Research >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Error-free into the Quantum Computer Age

A study carried out by an international team of researchers and published in the journal Physical Review X shows that ion-trap technologies available today are suitable for building large-scale quantum computers. The scientists introduce trapped-ion quantum error correction protocols that detect and correct processing errors.

In order to reach their full potential, today’s quantum computer prototypes have to meet specific criteria: First, they have to be made bigger, which means...

Im Focus: Search for planets with Carmenes successful

German and Spanish researchers plan, build and use modern spectrograph

Since 2016, German and Spanish researchers, among them scientists from the University of Göttingen, have been hunting for exoplanets with the “Carmenes”...

Im Focus: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

The body's street sweepers

18.12.2017 | Life Sciences

Fast flowing heat in layered material heterostructures

18.12.2017 | Materials Sciences

Life on the edge prepares plants for climate change

18.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>