Navigation Links
Arctic lake sediments show warming, unique ecological changes in recent decades
Date:10/20/2009

and three interglacial periods.

The sediment cores showed that several types of mosquito-like midges that flourish in very cold climates have been abundant at the lake for the past several thousand years. But the cold-adapted midge species abruptly began declining in about 1950, matching their lowest abundances of the last 200,000 years. Two of the midge species adapted to the coldest temperatures have completely disappeared from the lake region, said Axford.

In addition, a species of diatom, a lake algae that was relatively rare at the site before the 20th century, has undergone unprecedented increases in recent decades, possibly in response to declining ice cover on the Baffin Island lake.

"Our results show that the human footprint is overpowering long-standing natural processes even in remote Arctic regions," said co-author John Smol of Queen's University. "This historical record shows that we are dramatically affecting the ecosystems on which we depend."

The ancient lake sediment cores are the oldest ever recovered from glaciated parts of Canada or Greenland. Massive ice sheets during ice ages generally scour the underlying bedrock and remove previous sediments.

"What is unique about these sediment cores is that even though glaciers covered this lake, for various reasons they did not erode it," said study co-author Jason Briner of the University at Buffalo. The result is that we have a really long sequence of sediment that has survived Arctic glaciations."

Axford emphasized the multiyear research project required expertise from each of the five institutions involved in the PNAS study. "This was a team effort all the way around, and each of the institutions has a unique set of skills that allowed us to carry out this study," she said. "We needed people who understood algae, insects, glaciers and geochemistry, not to mention how to drive snowmobiles and extract the cores."

The study was f
'/>"/>

Contact: Yarrow Axford
yarrow.axford@colorado.edu
303-492-7641
University of Colorado at Boulder
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Texas researchers and educators head for Antarctica
2. LSU professor looks for life in and under antarctic ice
3. Satellites witness lowest Arctic ice coverage in history
4. Woods Hole Research Center to lead undergraduate initiative in the Siberian Arctic
5. Less Arctic ice means higher risks, experts warn
6. ANDRILLs 2nd Antarctic drilling season exceeds all expectations
7. Massive dinosaur discovered in Antarctica sheds light on life, distribution of sauropodomorphs
8. High degree of resistance to antibiotics in Arctic birds
9. Antarctic ice loss
10. Exploration of lake hidden beneath Antarcticas ice sheet begins
11. Antarctic expedition provides new insights into the role of the Southern Ocean for global climate
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Arctic lake sediments show warming, unique ecological changes in recent decades
(Date:11/7/2014)... Leading Biometric companies aim to provide ... online transactions.  Companies in focus today are: NXT-ID, Inc. (NASDAQ: ... BABA ), Google Inc. (NASDAQ: GOOG ), Microsoft ... EBAY ) and MasterCard Inc. (NYSE: MA) ... biometric authentication company focused on the growing mobile commerce is ...
(Date:11/6/2014)... Baltimore, MD, November 6, 2014 - Insilico Medicine, ... in aging and age related diseases announced a ... medicine of cancer, Champions Oncology, Inc (OTC: CSBR). ... genomics for personalized medicine, but Champions Oncology,s TumorGraft ... can validate the chemotherapy regimen experimentally generating vast ...
(Date:11/4/2014)... 2014 – University of Utah engineers developed the first ... fuel produce electricity without needing to ignite the fuel. ... portable electronics, off-grid power and sensors. , A study ... American Chemical Society journal ACS Catalysis . , ... reaction between a fuel and an oxygen-rich source such ...
Breaking Biology News(10 mins):Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 2Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 3Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 4Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 5Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 6Insilico Medicine, Inc announces research collaboration with Champions Oncology, Inc 2Jet-fueled electricity at room temperature 2
... University of York's Department of Chemistry have developed a ... unpleasant and dangerous side-effects of radiotherapy. , PhD students ... fellow Mark Godber, have developed the gel which will ... Now, the group has secured £30,000 under the Bioscience ...
... oil, which have antioxidant, anti-inflammatory and anti-clotting properties, ... so-called Mediterranean Diet, according to a new study ... Journal of the American College of Cardiology. , ... the Mediterranean diet on cardiovascular disease and arteriosclerosis ...
... California condors raised in captivity be released near seal and ... feast on the carcasses of marine mammals as their ancestors ... four other institutions base their conclusion on the feeding behavior ... in the Nov. 7 online edition of the Proceedings of ...
Cached Biology News:Young scientists turn to gel to ease side-effects of cancer treatment 2Phenolic compounds may explain Mediterranean diet benefits 2Phenolic compounds may explain Mediterranean diet benefits 3Seal rookeries could provide a reliable food source for endangered California condors, study finds 2Seal rookeries could provide a reliable food source for endangered California condors, study finds 3Seal rookeries could provide a reliable food source for endangered California condors, study finds 4Seal rookeries could provide a reliable food source for endangered California condors, study finds 5
(Date:11/21/2014)... USA (PRWEB) November 19, 2014 The ... our lives was shared with more than 200 primary ... postgraduate students from the University of Otago Physics Department ... . The Otago students, members of the university’s OSA/SPIE ... Zealand in early September, giving children from small, rural ...
(Date:11/21/2014)... The California Healthcare Institute ... representing leading California academic institutions, biotechnology, medical device, ... today released a report revealing that California ... The trend shows a 4 percent increase between ... Industry Report indicates that, while biopharmaceutical and ...
(Date:11/21/2014)... Arkansas (PRWEB) November 20, 2014 ... Pinnacle Ozone Solutions, LLC (Pinnacle), and PCI, Inc., ... announced that they have been selected to provide ... of Fayetteville, Arkansas Paul R. Noland Wastewater Treatment. ... BlueInGreen’s patented HyDOZ® gas dissolution technology, ...
(Date:11/21/2014)... 21, 2014 2014 Deep Research ... and in-depth research report on the transformer market. ... classification, application, and industry chain structure as well ... market analysis, including China’s domestic market as well ... economic situation analysis. The report also covers information ...
Breaking Biology Technology:Optics and photonics outreach programs share science, spark fascination with light 2Optics and photonics outreach programs share science, spark fascination with light 3California Healthcare Institute and PwC Report Boom in California’s Biomedical Industry 2California Healthcare Institute and PwC Report Boom in California’s Biomedical Industry 3California Healthcare Institute and PwC Report Boom in California’s Biomedical Industry 4City of Fayetteville Leads Nation with Innovative Ozone Technology 2City of Fayetteville Leads Nation with Innovative Ozone Technology 3City of Fayetteville Leads Nation with Innovative Ozone Technology 4International Transformer Industry - Analysis on Applications, Development & Forecasts Now Available at ReportsnReports.com 2International Transformer Industry - Analysis on Applications, Development & Forecasts Now Available at ReportsnReports.com 3
... May 12 Aton Pharma, Inc., a global,specialty ... a,distribution agreement with Meizler Biopharma S/A to commercialize,CUPRIMINE(R) ... in,Brazil, and Meizler is working to obtain regulatory ... medically essential products, and Aton is,committed to making ...
... Poised to Impact Lung Cancer Care, ST. ... medical,device start-up company, has secured $4.75M in venture ... IG4 delivery system for minimally,invasive biopsy and ablation ... and was joined by Advantage Capital Partners and ...
... (NYSE:,CVD) today announced that it will present at the ... 2008 at 10:30 am ET. Investors may,access a live ... order to,register and download any necessary software, please log ... New Jersey, is one of the,world,s largest and most ...
Cached Biology Technology:Aton Pharma Announces Distribution Partnership in Brazil 2Veran Medical Technologies Secures $4.75M in First Institutional Funding 2
... ProteinChip Antibody Capture Kit ... and optimization steps typically ... interactions. This kit enables ... of multiple antigens based ...
... Custom design, The Bioactive peptides are molecules ... a biological behaviour or activity which can ... pharmaceutical, diagnostic, chemical and agro-food applications. In ... modified peptides with superior properties for therapeutic ...
... This CLS number is ... to easily match Cornings product ... yet, please order under the ... contact customer service for assistance. ...
... Series Hybridization chambers with forced convection ... ambient up to 99.9 C / 212 F ... and reproducible results DS controller Timer ... with an accuracy of a tenth of a ...
Biology Products: