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 Decoding the regulation of cell survival - A major step towards preventing neurons from dying
04.10.2018 | DFG-Forschungszentrum für Regenerative Therapien TU Dresden

nachricht New Cluster of Excellence “Centre for Tactile Internet with Human-in-the-Loop” (CeTI)
28.09.2018 | Technische Universität Dresden

All articles from Interdisciplinary Research >>>

The most recent press releases about innovation >>>

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

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

Im Focus: Coping with errors in the quantum age

Physicists at ETH Zurich demonstrate how errors that occur during the manipulation of quantum system can be monitored and corrected on the fly

The field of quantum computation has seen tremendous progress in recent years. Bit by bit, quantum devices start to challenge conventional computers, at least...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

How algae and carbon fibers could sustainably reduce the athmospheric carbon dioxide concentration

14.11.2018 | Life Sciences

NIH scientists illuminate causes of hepatitis b virus-associated acute liver failure

14.11.2018 | Life Sciences

The unintended consequences of dams and reservoirs

14.11.2018 | Earth Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>