Navigation Links
Queen's scientists on international team discover 'ecologically unique' changes in Arctic lake
Date:10/20/2009

Kingston, ON Queen's University biologists are part of an international research team whose discovery of a rare sediment core in a remote Arctic lake provides compelling evidence of unprecedented environmental changes occurring over the past few decades.

"Our findings show that the last several decades have been the most ecologically unique in 200,000 years," says Neal Michelutti, a research scientist at the Paleoecological Environmental Assessment and Research Lab (PEARL) at Queen's. With Biology professor John Smol, Canada Research Chair in Environmental Change, and master's student Cheryl Wilson, the Queen's researchers are part of a multidisciplinary team led by University of Colorado scientist Yarrow Axford.

Other members of the team are from the University of Alberta, University of Buffalo and University of Massachusetts.

The sediment core, retrieved from a lake bottom on Baffin Island, predates by about 80,000 years the oldest cores from the Greenland Ice Sheet, capturing two ice ages as well as three interglacial periods. "Lake sediments are natural recorders of climate and environmental changes, as they preserve archives of past geochemical and physical conditions, as well as a diverse record of important biological indicators," Ms Wilson explains. The research team used algae and aquatic insect fossils preserved in the sediment core to reconstruct past climatic and other environmental conditions.

Their analyses show that changes in species, as well as lake-water chemistry, were tightly linked to past shifts in climate. The sediment records have allowed the team to reconstruct climatic and environmental conditions of the past three warm periods between the last two ice ages, and compare them to the human-influenced climate of today.

"The 20th century is the only period during the past 200 millennia in which aquatic indicators reflect increased warming, despite the declining effect of slow changes in the tilt of the Earth's axis which, under natural conditions, would lead to climatic cooling," notes the University of Colorado's Dr. Axford.

Such long lake records are extremely rare in glacial regions because the massive ice sheets during past ice ages typically scraped and scoured the underlying bedrock and removed previous sediment records, much like a huge bulldozer. The Baffin Island lake was spared this scouring due to the presence of what is known as cold-based ice, which is non-erosive and acts to preserve landscape features such as lakes and the sediments contained within their basins.

"Our results show that the 'human footprint' is overpowering long-standing natural processes, even in remote Arctic regions," says Dr. Smol, winner of the 2004 NSERC Herzberg Gold Medal as Canada's top scientist. "This historical record shows that we are dramatically affecting the ecosystems on which we depend. We have started uncontrolled experiments on this planet, and we have entered unchartered territory. The situation is far worse than we thought and this is only the beginning."


'/>"/>

Contact: Nancy Dorrance
nancy.dorrance@queensu.ca
613-533-2869
Queen's University
Source:Eurekalert  

Related biology news :

1. For honey bee queens, multiple mating makes a difference
2. UK scientists working to help cut ID theft
3. Scientists show that mitochondrial DNA variants are linked to risk factors for type 2 diabetes
4. Comet probes reveal evidence of origin of life, scientists claim
5. Scientists link fragile X tremor/ataxia syndrome to binding protein in RNA
6. Male elephants get photo IDs from scientists
7. Scientists retrace evolution with first atomic structure of an ancient protein
8. Muscle mass: Scientists identify novel mode of transcriptional regulation during myogenesis
9. Carnegie Mellon scientists develop nanogels that enable controlled delivery of carbohydrate drugs
10. Clemson scientists shed light on molecules in living cells
11. Scientists tackle mystery mountain illness
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Queen's scientists on international team discover 'ecologically unique' changes in Arctic lake
(Date:3/15/2016)... -- --> --> According ... "Digital Door Lock Systems Market - Global Industry Analysis, Size, ... digital door lock systems market in terms of revenue was ... to grow at a CAGR of 31.8% during the period ... (MSMEs) across the world and high industrial activity driving inclusive ...
(Date:3/11/2016)... http://www.apimages.com ) - --> http://www.apimages.com ) - ... Images ( http://www.apimages.com ) - Germany . ... new refugee identity cards. DERMALOG will be unveiling this device, and ... Hanover next week.   --> Germany ... the new refugee identity cards. DERMALOG will be unveiling this device, ...
(Date:3/9/2016)... 9, 2016 This BCC Research report provides ... the RNA Sequencing (RNA Seq) market for the years ... tools and reagents, data analysis, and services. ... the RNA-Sequencing market such as RNA-Sequencing tools and reagents, ... factors affecting each segment and forecast their market growth, ...
Breaking Biology News(10 mins):
(Date:5/27/2016)... , May 27, 2016 At present, ... playing in this space know that volatility is what makes ... companies on ActiveWallSt.com: Synta Pharmaceuticals Corp. (NASDAQ: SNTA ... Inc. (NASDAQ: LPTN ), and Heat Biologics Inc. ... access to the technical alerts for these stocks at: ...
(Date:5/26/2016)... NEW YORK , May 26, 2016 ... industry, investors see value in this space. Today,s pre-market research ... Healthcare equities: Radius Health Inc. (NASDAQ: RDUS ), ... (NASDAQ: ARWR ), and Five Prime Therapeutics Inc. ... these stock technical briefings at: http://www.activewallst.com/ ...
(Date:5/25/2016)... (PRWEB) , ... May 25, 2016 , ... Lajollacooks4u has ... and has consistently been rated one of its top attractions. Fortune 500 companies, ... to participate in a unique and intimate team-building experience. , Each event kicks off ...
(Date:5/25/2016)... , ... May 25, 2016 , ... ... information (RFI) issued by the Office of the National Coordinator for Health IT ... and determines if clinically relevant data were available when and where it was ...
Breaking Biology Technology: