ALBUQUERQUE--After combing through layers of ancient lake sediments, paleoecologist Jacquelyn Gill of the University of Wisconsin–Madison says her team has found no evidence to support a controversial ...
... of Lake Washington, a typical freshwater lake of moderate temperature and average levels of compounds such as methane, produced by decomposing organisms, in the sediment. Then they mixed the mud with ...
... decades, and certainly no data on longer term time scales," she says. "However, lake ... although the study was focused on algae preserved in lake sediments, changes to other parts of the aquatic ecosystem ...
... scientists from the Department of Zoology at the University of Gothenburg these midge bones become a time machine that can document 200 years of acidification and fish elimination in Swedish lakes...
... parts of the phantom midge are microscopic. But in the hands of scientists these midge bones become a time machine that can document 200 years of acidification and fish elimination in Swedish lakes.
... data."
To develop a robust reconstruction of temperature change, the "proxy" temperature records from lake sediments were combined with existing data from tree rings and glacier ice.
"We focus on ...
... University at Buffalo geologists from a remote Arctic lake show that recent variations are unlike those that have been seen ... around 10,000 years ago, the lake sediment cores people get there only cover ...
... surprised to find thick layers of ancient lake sediment filled with plant, fish and animal ... now deserts, and yet we found those thick deposits of lake sediments with abundant fossil fish and shells," ...
A new geochemical study illuminates 7,000 years of mining and metal use in central China and links these trends to fluctuations in airborne pollution during the Bronze Age and other military and ...
... record."
The proxies used by the researchers included information from marine and lake sediment cores, ice cores, coral cores and tree rings.
"We looked at a much expanded database and ...
... is the largest
prehistoric flying reptile without teeth ever to have been found.
The name comes from its preservation in lake sediments of the
Araripe basin in north-east Brazil, a site well known for ...
... detailing the amount of charcoal contained in soils and lake sediments at the sites of both pre-Columbian ... data from charcoal records from 15 sediment cores extracted from lakes, soil samples from 17 ...
... decades. The team used 35 records of charcoal accumulation in lake sediments from sites across North America to see whether fire regimes across the continent showed any response ...
... Piperno, a Temple University anthropology alumna, finding evidence in the form of pollen and charcoal in lake sediments that forests were being cut down and burned in the Central Balsas River Valley ...
... West Africa where varves, annual sediment layers, are preserved. This allows us to look at ... leading cause of the West African droughts.
The lake's sediment record is also punctuated by less frequent, ...
