Navigation Links
CU-Boulder study shows 53 million-year-old high Arctic mammals wintered in darkness
Date:6/1/2009

/p>

"We were able to use carbon signatures preserved in the tooth enamel to show that these mammals did not migrate or hibernate," said Eberle. "Instead, they lived in the high Arctic all year long, munching on some unusual things during the dark winter months." The study was funded by the National Science Foundation.

An analysis of oxygen isotopes from the fossil teeth helped determine seasonal changes in surface drinking water tied to precipitation and temperature, providing additional climate information, said Eberle. The results point to warm, humid summers and mild winters in the high Arctic 53 million years ago, where temperatures probably ranged from just above freezing to near 70 degrees Fahrenheit, Eberle said.

The environment on central Ellesmere Island, located at about 80 degrees north latitude, was part of a much larger circumpolar Arctic region at the time, she said. It probably was similar to swampy cypress forests in the southeast United States today and still contains fossil tree stumps as large as washing machines, Eberle said.

On central Ellesmere Island in today's high Arctic -- a polar desert that features tundra, permafrost, ice sheets, sparse vegetation and a few small mammals -- the temperature ranges from roughly minus 37 degrees F in winter to 48 degrees F in summer and is the coldest, driest environment on Earth. There is sunlight in the high Arctic between October and February, and the midnight sun is present from mid-April through the end of August.

The year-round presence of mammals such as the hippo-like Coryphodon, tapirs and brontotheres in the high Arctic was a "behavioral prerequisite" for their eventual dispersal across high-latitude land bridges that geologists believe linked Asia and Europe with North America, Eberle said. Their dietary chemical signatures, portly shapes and fossil evidence for babies and juveniles in the Arctic preclude the idea of long, seasonal migrations t
'/>"/>

Contact: Jaelyn Eberle
jaelyn.eberle@colorado.edu
303-492-8069
University of Colorado at Boulder
Source:Eurekalert  

0

GOOD

Page: 1 2 3 4

Related biology news :

1. CU-Boulder team discovers first ancient manioc fields in Americas
2. Nutrient pollution drives frog deformities by ramping up infections, says CU-Boulder study
3. CU-Boulder worm study sheds light on human aging, inherited diseases
4. CU-Boulder technology used to identify unexpected bacteria in cystic fibrosis patients
5. Conservation strategies must shift with global environmental change, says CU-Boulder study
6. Dust in West up 500 percent in past 2 centuries, says CU-Boulder study
7. Regional nuclear conflict would create near-global ozone hole, says CU-Boulder study
8. Low-gravity training machine reduces joint, muscle impacts, says CU-Boulder study
9. CU-Boulder, biotech firm team up on python project in search for human cardiac therapeutics
10. Biological invasions increasing due to freshwater impoundments, says CU-Boulder study
11. As Andean glacier retreats, tiny life forms swiftly move in, CU-Boulder study shows
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
CU-Boulder study shows 53 million-year-old high Arctic mammals wintered in darkness
(Date:5/21/2013)... the past few decades, scientists have developed many devices ... metallic stents. While generally effective, each of these treatments ... A new study from MIT analyzes the potential usefulness ... angioplasty balloons and drug-releasing stents, but may pose fewer ... in the artery for only a brief period, during ...
(Date:5/21/2013)... 21, 2013 Royal Philips Electronics (NYSE: PHG, ... first portable ultrasound with Philips, industry leading Live 3D ... CX50 xMATRIX with available Live 3D TEE and ICE ... at the EuroPCR, official meeting for the European Association ... Since its launch in 2012, Philips CX50 xMATRIX has ...
(Date:5/20/2013)... Minnesota Medical School researchers from the Masonic Cancer Center, ... Tumor Program, have developed a new mouse model of ... to discover new genes and gene pathways driving this ... week in the journal Nature Genetics . , ... lab of David Largaespada, Ph.D., professor in the Medical ...
Breaking Biology News(10 mins):Evaluating a new way to open clogged arteries 2Evaluating a new way to open clogged arteries 3Philips CX50 xMATRIX now offers world-class interventional and diagnostic features on single portable system 2U of M researchers develop model for better testing, targeting of MPNST 2
... add a few years to a human life span, but ... as many have speculated, evolutionary biologists report. , "Our message ... not going to have a big payoff in terms of ... once heard someone say caloric restriction may not make you ...
... From the surface, the ocean appears to be vast ... zooplankton are swept into clusters and patches by ocean ... to whales--and the success of fishermen catches can depend ... almost a century ocean scientists have suspected that these ...
... The Scripps Research Institute are reporting that mice created to ... receptor have fertility problems, which suggests that these receptors play ... of the journal Nature, the scientists detail how mice that ... cells in a mouse's womb, have fertility problems. These mice ...
Cached Biology News:Caloric restriction won't dramatically extend life span in humans: UCLA research 2Caloric restriction won't dramatically extend life span in humans: UCLA research 3Researchers use 3-D imaging system to unveil swimming behavior of microscopic plankton 2Researchers use 3-D imaging system to unveil swimming behavior of microscopic plankton 3Scripps research scientists identify infertility molecule 2Scripps research scientists identify infertility molecule 3Scripps research scientists identify infertility molecule 4Scripps research scientists identify infertility molecule 5
(Date:5/21/2013)... -- Personal Genome Diagnostics Inc. (PGDx), today announced that ... in genomic analysis of defined cancer subtypes to ... Medicines.  PGDx is an innovator in conducting patient-specific ... and Blueprint Medicines is an expert in developing ... patient population. "This collaboration brings together ...
(Date:5/21/2013)... CA (PRWEB) May 21, 2013 ... at the University of California, San Diego for a ... load bearing Gravitic™ MRI (Magnetic Resonance Imaging) with that ... renowned for its continued pursuit of improved healthcare by ... Spinal MRI is an extremely valuable tool for evaluating ...
(Date:5/21/2013)... Clinovo's new “CDISC Standards: Theory and Application” ... June 11th, 2013. The TechTrainings are technical hands-on classes ... step in their professional career. The class will be ... online. , Taught by Sy Truong, President at Meta-Xceed ... Theory and Application” class will give an overview of ...
(Date:5/20/2013)... -- Today, at the American Psychiatric Association (APA) Meeting ... James McGough , M.D., M.S., principal investigator and ... Neuroscience and Human Behavior and David Geffen ... California Los Angeles (UCLA), and director of clinical teaching ... at UCLA, presented the results of a Phase I ...
Breaking Biology Technology:Personal Genome Diagnostics And Blueprint Medicines Form Collaboration to Identify Novel Kinase Targets 2Personal Genome Diagnostics And Blueprint Medicines Form Collaboration to Identify Novel Kinase Targets 3Vital Imaging Makes Greater Commitment into MRI Research 2Vital Imaging Makes Greater Commitment into MRI Research 3Clinovo Launches TechTrainings on CDISC Standards 2Positive Results Reported for Phase I Clinical Trial at UCLA for the Treatment of ADHD in Children Using External Trigeminal Nerve Stimulation (eTNS) 2Positive Results Reported for Phase I Clinical Trial at UCLA for the Treatment of ADHD in Children Using External Trigeminal Nerve Stimulation (eTNS) 3Positive Results Reported for Phase I Clinical Trial at UCLA for the Treatment of ADHD in Children Using External Trigeminal Nerve Stimulation (eTNS) 4Positive Results Reported for Phase I Clinical Trial at UCLA for the Treatment of ADHD in Children Using External Trigeminal Nerve Stimulation (eTNS) 5
... ENABLING HIGH-THROUGHPUT, LOW-COST ASSAYS, , , , ... IMPROVED DATA , , ... COST , , Every major pharmaceutical company uses the,Molecular Devices ... discovery process.,The FLIPR Calcium Assay Kit from Molecular,Devices provides the ...
... Michael Su, M.S. and Jin Liao, M.D., Ph.D., ... Molecular Devices Corporation, 8/00 , , INTRODUCTION ... is very popular foruse in Reporter Gene Assays. The enzyme catalyzes ... 1) 1 . When luciferase is the limiting component in the ...
... , ... , INTRODUCTION , Immunoassays have ... were necessary to ensure that they fell within the dynamic ... sensitivity and dynamic range, have become commercially available 1 . ...
Cached Biology Technology:FLIPR Calcium Assay Kit Datasheet 2FLIPR Calcium Assay Kit Datasheet 3Luciferase Reporter Gene Cells and Recombinant Luciferase Dilutions Studied with the CLIPR Luciferase Assay Kit and the LMax Microplate Luminometer (MaxLine Application Note #38) 2Luciferase Reporter Gene Cells and Recombinant Luciferase Dilutions Studied with the CLIPR Luciferase Assay Kit and the LMax Microplate Luminometer (MaxLine Application Note #38) 3Luciferase Reporter Gene Cells and Recombinant Luciferase Dilutions Studied with the CLIPR Luciferase Assay Kit and the LMax Microplate Luminometer (MaxLine Application Note #38) 4High Sensitivity, Wide Dynamic Range, Horseradish Peroxidase (HRP) ELISA Using the LMax Microplate Luminometer (MaxLine Application Note #41) 2High Sensitivity, Wide Dynamic Range, Horseradish Peroxidase (HRP) ELISA Using the LMax Microplate Luminometer (MaxLine Application Note #41) 3
... generation dispenser combining the most versatile features for ... the existing Multidrop dispensers. , ,It is ... 500 nl up to 2500 l with excellent ... optimized for multiple plate formats (96, 384, 1536) ...
... consumption of reagents and increased throughput, ... 384 is an automated dispenser designed ... into 384- and 96-well plates.This new-generation ... easily switch from 96- to 384- ...
MBS 384 well satellite block unit with height adjusting heated lid, 384 well block holds 1 x 0.04 ml 384 well plate...
384 well block MBSr. Robot compatible block ejection mechanism. Stackable. (384 well block - holds 384 well plate)...
Biology Products: