HOME >> BIOLOGY >> NEWS
Ancient fossil offers new clues to brown bears past

Fairbanks, AlaskaWhile nosing around the Quaternary mammal collection at the Provincial Museum of Alberta two years ago, Paul Matheus, a paleontologist with the Alaska Quaternary Center, came across a brown bear fossil that seemed out of place. The fossil had been collected by Jim Burns, curator of Quaternary mammals at the PMA a few years earlier near Edmonton, Alberta, in gravels that date to before the last ice age (older than 24,000 years). If this was true, Matheus thought, it could be a very important find. Burns loaned the specimen to Matheus so he could take it back to the University of Alaska Fairbanks to confirm its age using radiocarbon dating methods. Results showed the bear was indeed about 26,000 years old, and the two researchers realized the fossil's signficance--the history of brown bears in North America would have to be rewritten.

The ancestors of modern brown bears in North America are believed to have migrated from Asia to Alaska and Yukon (then a part of Beringia) between 50,000 and 100,000 years ago, and old brown bear fossils are not particularly uncommon in Beringia. Between roughly 13,000-23,000 years ago, the route from Beringia to areas of the continent further south was blocked by continental glaciers, so brown bears were more or less bottled up in Beringia. The oldest brown bear fossils south of Beringia, in areas like southern Canada and the northern U.S., are about 12,000-13,000 years old, so paleontologists concluded that's when they first arrived.

"It's always been a mystery, though, why brown bears didn't migrate farther south if they were in Beringia as early as 100,000 years ago and the passage south wasn't blocked by glaciers until about 23,000 years ago," said Matheus. "The discovery of the Edmonton specimen indicates that brown bears migrated south much earlier than previously thought."

The recent findings and their implications, are the subject of an article in the Nov. 12 issue of the journal Sc
'"/>

Contact: Paul Matheus
ffpem@uaf.edu
867-456-7551
University of Alaska Fairbanks
12-Nov-2004


Page: 1 2 3

Related biology news :

1. Ancient retrovirus sheds light on modern pandemic
2. Ancient Etruscans were immigrants from Anatolia, or what is now Turkey
3. Ancient DNA traces the woolly mammoths disappearance
4. Ancient amphibians evolved a bite before migrating to dry land
5. Ancient T. rex and mastodon protein fragments discovered, sequenced
6. Ancient coral reef tells the history of Kenyas soil erosion
7. Ancient genes used to produce salt-tolerant wheat
8. Ancient climate change may portend toasty future
9. Ancient ape ruled out of mans ancestral line
10. Ancient predator had strongest bite of any fish, rivaling bite of large alligators and T. rex
11. Ancient birds flew on all-fours

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Ancient fossil offers new clues brown bears past

(Date:8/5/2015)... 2015 Transparency Market Research has ... - Global Industry Analysis, Size, Share, Growth, Trends and ... recognition is forecast to reach US$ 2,671.8 Mn by ... surveillance systems by civil and government agencies. This is ... terrorist activities across the globe that would elevate the ...
(Date:8/3/2015)... , Aug. 3, 2015 Synaptics, Inc. (Nasdaq: ... solutions, today announced that members of the executive management ... Pacific Crest Global Technology Leadership Forum on Tuesday, August ... will be held at the Sonnenalp Resort in ... presentation may include forward-looking information. An audio webcast of ...
(Date:7/31/2015)... , Chine, 31 juillet 2015 ... www.icg-10.org ) sera organisée par le BGI ... Shenzhen en Chine. ... Depuis son inauguration en 2006, l,ICG est devenue ... dans le domaine des « omiques » et c,est aussi ...
Breaking Biology News(10 mins):Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 2Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 3Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 4Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 5Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 6La 10e International Conference on Genomics (ICG-10) doit s'ouvrir en octobre 2La 10e International Conference on Genomics (ICG-10) doit s'ouvrir en octobre 3
(Date:8/27/2015)... 2015  Neogen Corporation (NASDAQ: NEOG ) announced ... United Kingdom -based Lab M Holdings, a ... diagnostic systems. Lab M was founded ... of microbial testing and diagnostic products for the global ... currently sells into more than 70 countries worldwide, and ...
(Date:8/27/2015)... SAN DIEGO , Aug. 27, 2015 ... second annual meeting of the Japan Society of HTLV-1, ... Science Institute Auditorium. The purpose of the Society is ... well as the development of medical technology and research ... health and welfare. "HUYA is proud to ...
(Date:8/27/2015)... , ... August 27, 2015 , ... ... Medicine, recently presented new data on the relationship of genetics and hypertension at ... Congress on Heart Disease in Vancouver, British Columbia, Canada. The event, which boasts ...
(Date:8/26/2015)... , Aug. 26, 2015  The Diabetes ... the University of Miami Miller School of Medicine, ... clinical trial to test for the first time ... successfully completed.  This FDA approved Phase I/II study ... transplantation and is an important first step toward ...
Breaking Biology Technology:Neogen acquires U.K.-based Lab M Holdings 2HUYA Bioscience International Sponsors Japan Society Of HTLV-1 Annual Meeting 2HUYA Bioscience International Sponsors Japan Society Of HTLV-1 Annual Meeting 3HUYA Bioscience International Sponsors Japan Society Of HTLV-1 Annual Meeting 4Proove Biosciences Presents Ground-Breaking Data on Genetics and Heart Disease at 20th World Congress on Heart Disease 2Proove Biosciences Presents Ground-Breaking Data on Genetics and Heart Disease at 20th World Congress on Heart Disease 3Diabetes Research Institute Successfully Transplants First Patient In Pilot BioHub Trial 2Diabetes Research Institute Successfully Transplants First Patient In Pilot BioHub Trial 3Diabetes Research Institute Successfully Transplants First Patient In Pilot BioHub Trial 4
Cached News: