Navigation Links
Biologists report more bad news for polar bears
Date:11/24/2010

nt skull for eating these kinds of foods."

In Canada, grizzly bears are moving north and are already in polar bear territory, Van Valkenburgh and Slater said.

The life scientists whose co-authors include UCLA undergraduates Leeann Louis and Paul Yang and graduate student Borja Figueirido from Spain's Universidad de Malaga, Campus Universitario de Teatinos studied two adult male skulls from museums, one of a polar bear from Canada, the other of a grizzly from Alaska. They built 3-D computer models of the skulls and then analyzed their biomechanics.

"We can apply muscle forces to the skull to simulate biting, and we can measure how hard the animal could bite. We can measure stress and strain in the skull as well," Slater said. "We found that while the stresses in the grizzly bear skull are relatively low, the same bites in the polar bear produce much more stress. Combined with other evidence from Blaire's laboratory, this tells us that the smaller teeth of polar bears are less suited to diets that consist of plants, grass, vegetation and berries."

"Polar bears would not be able to break up the food as well in their mouths and would not digest it as well," Van Valkenburgh said.

In the timeline of evolution, polar bears evolved from the brown bear very recently, and the two are very closely related, Van Valkenburgh and Slater said. Genetic studies indicate that the split between polar bears and brown bears occurred only 500,000 to 800,000 years ago the most recent split between any of the eight bear species.

Despite the recentness of the split between these two species, their skulls and teeth are extremely different, probably as a result of where they live (arctic versus temperate regions) and the differences in their diets. Grizzly bears have very large molar teeth, while polar bears have teeth that are much smaller. Polar bears eat seal blubber, which is soft and does not require much chewing, while
'/>"/>

Contact: Stuart Wolpert
swolpert@support.ucla.edu
310-206-0511
University of California - Los Angeles
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Biologists identify influence of environment on sexual vs. asexual reproduction
2. Penn biologists say species accumulate on Earth at slower rates than in the past
3. Microbiologists find source of fungus’s damaging growth
4. Biologists discover biochemical link between biological clock and diabetes
5. Plant biologists lead biobased-fuel research projects
6. Biologists find way to reduce stem cell loss during cancer treatment
7. Capacity for exercise can be inherited, UC Riverside biologists find
8. CCNY biologists study rainforest host-plant associations
9. Scripps Oceanography biologists awarded prestigious honors
10. Biologists meet with members of Congress
11. Rapid growth in adolescence leads to fewer offspring, UC Riverside biologists find
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/26/2014)... problems such as global warming and poverty the ... burden fall on our failure as consumers to ... study in the Journal of Consumer Research ... global problems from governments to consumers and ultimately ... convince politicians to encourage responsible consumption instead of ...
(Date:8/26/2014)... suggested an increased risk of autism among children ... actually reflect the known increased risk associated with ... advance online publication in Molecular Psychiatry , ... while a diagnosis of autism spectrum disorder ... prescribed antidepressants during pregnancy than in those with ...
(Date:8/26/2014)... A study from the University of Liverpool has recommended investing ... target physical inactivity and problems such as obesity in both ... papers published since 1990, the researchers found that access to ... could all motivate people to get out and take more ... of dog owners don,t take their dogs for a walk. ...
Breaking Biology News(10 mins):An inconvenient truth: Does responsible consumption benefit corporations more than society? 2Study calls into question link between prenatal antidepressant exposure and autism risk 2Study calls into question link between prenatal antidepressant exposure and autism risk 3Education and dog-friendly neighbourhoods could tackle obesity 2
... bacteria are bad. In fact, beneficial microbes could ... treat a variety of diseases in humans and animals ... disorders, according to a report released by the American ... "Theoretically, beneficial microorganisms could be used to treat a ...
... at Buffalo have received a $2.5 million five-year grant ... called "hibernating myocardium" that can cause disabling heart failure ... condition in which myocytes (cells in the heart's muscular ... receive reduced blood flow over an extended period of ...
... gene that could lead to breakthroughs in breast and ... called SLIRP, was discovered by a team at the ... Cancer Medicine, led by Professor Peter Leedman, in collaboration ... Medicine in Texas. , "When we baited our hook ...
Cached Biology News:Report focuses on the role good microbes play in future medicine 2Reversing 'hibernating' heart muscle focus of UB researchers 2Gene discovery opens door to tackling disease 2
(Date:8/27/2014)... 2014 Research and Markets has ... Pulp & Paper Industry Report 2014" report to ... Pulp & Paper Industry Report 2014 is a professional ... global enzyme for pulp & paper industry. ... including definitions, classifications, applications and industry chain structure. The ...
(Date:8/27/2014)... Beach County, Florida (PRWEB) August 27, 2014 ... Company Inc. (SCI) is announcing the creation of ... priority is to take the SCI’s philosophy of ... the company’s research and development actions are based ... , This new Scientific Advisory Board provides a ...
(Date:8/27/2014)... (PRWEB) August 27, 2014 Remcom announces ... with new features for the biomedical industry. ... enhanced Biological Thermal Sensor, exclusive to the Bio-Pro version ... version of XFdtd, developed to calculate the biological effects ... has been added to all versions to expand engineers’ ...
(Date:8/26/2014)... 2014  NeuroSigma, Inc., a Los Angeles ... technologies, today announced that it has filed a registration ... Exchange Commission relating to a proposed initial public offering ... be offered and the price range for the proposed ... LLC will act as the book-running manager for the ...
Breaking Biology Technology:Global Enzyme for Pulp & Paper Industry Report 2014 2New Sancilio & Company, Inc. Scientific Board 2New Sancilio & Company, Inc. Scientific Board 3Remcom Announces Enhanced Biological Thermal Sensor and Other Biomedical Features in XFdtd EM Simulation Software Update 2Remcom Announces Enhanced Biological Thermal Sensor and Other Biomedical Features in XFdtd EM Simulation Software Update 3
... VANCOUVER, May 11 /PRNewswire-FirstCall/ - OncoGenex Pharmaceuticals, Inc. ... final survival data from a randomized Phase 2 ... docetaxel alone as first-line chemotherapy in patients with ... an oral presentation at the American Society of ...
... May 11 Dalton Pharma Services and ProCitius Research ... with contract chemistry services of ... maintain their discovery and development output in an era ... of "offshore" contract research organizations ...
... Barnard, has been awarded the International Union of Pure ... Computational Physics. , The award acknowledges Dr Barnard as ... the structures, shapes and crystal structures of materials at ... Melbourne Institute of Technology (RMIT) University in 2001 ...
Cached Biology Technology:OncoGenex Pharmaceuticals' Clinical Programs to be Featured in Oral Presentations at the American Society of Clinical Oncology Annual Meeting 2OncoGenex Pharmaceuticals' Clinical Programs to be Featured in Oral Presentations at the American Society of Clinical Oncology Annual Meeting 3Dalton Pharma Services and ProCitius Announce a Strategic Alliance to Provide Contract Chemistry Services 2Dalton Pharma Services and ProCitius Announce a Strategic Alliance to Provide Contract Chemistry Services 3Big prize for 'small science' physicist 2
...
... Black wall plates have low background ... crosstalk,• Not treated (or medium binding) ... and binds biomolecules through passive interactions,• ... immobilization of large molecules, such as ...
... is a compact benchtop and stackable ... controller with a large display screen ... speed. Air circulation inside to evenly ... can be easily calibrated from the ...
... MULTI-FUN Incubator is a compact ... uses a microprocessor controller with a ... temperature and agitation speed. Air circulation ... the incubator. Temperature can be easily ...
Biology Products: