Navigation Links
Evidence contradicts idea that starvation caused saber-tooth cat extinction
Date:12/26/2012

tilized carcasses more fully and likely competed more intensely for food than present-day large carnivores."

The latest study uses a new technique, called dental microwear texture analysis (DMTA), developed by co-authorPeter Ungar at the University of Arkansas. It uses a confocal microscope to produce a three-dimensional image of the surface of a tooth. The image is then analyzed for microscopic wear patterns. Chowing down on red meat produces small parallel scratches. Chomping on bones adds larger, deeper pits. Previous methods of dental wear analysis relied on researchers to identify and count these different types of features. DMTA relies on automated software and is considered more accurate because it reduces the possibility of observer bias.

DeSantis and Ungar, with the assistance of Blaine Schubert from East Tennessee State University and Jessica Scott from the University of Arkansas, applied DMTA to the fossil teeth of 15 American lions (Panthera atrox) and 15 saber-tooth cats (Smilodon fatalis) recovered from the La Brea tar pits in Los Angeles.

Their analysis revealed that the wear pattern on the teeth of the American lion most closely resembled those of the present-day cheetah, which actively avoids bones when it feeds. Similarly, the saber-tooth cat's wear pattern most closely resembled those of the present-day African lion, which indulges in some bone crushing when it eats. (This differs from a previous microwear study using a different technique that concluded saber-tooth cats avoided bone to a far greater extent.)

The researchers examined how these patterns changed over time by selecting specimens from tar pits of different ages, ranging from about 35,000 to 11,500 years ago. They did not find any evidence that the two carnivores increased their "utilization" of carcasses throughout this period. If anything, their analysis suggests that the proportion of the carcasses that both kinds of cats consumed ac
'/>"/>

Contact: David Salisbury
david.salisbury@vanderbilt.edu
615-343-6803
Vanderbilt University
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Chinese scientists discover evidence of giant pandas population history and local adaptation
2. First evidence of fish sensing geomagnetic fields from a Czech Christmas market
3. First evidence of ocean acidification affecting live marine creatures in the Southern Ocean
4. New evidence of dinosaurs role in the evolution of bird flight
5. More evidence needed to support use of autism interventions
6. Mobile phones and wireless networks: No evidence of health risk found
7. Researchers find first evidence for a genetic cause for Barretts oesophagus
8. First photo evidence of snub-nosed monkey species in China
9. Alpine Fault study shows new evidence for regular magnitude 8 earthquakes
10. Caltech researchers find evidence of link between immune irregularities and autism
11. Cancer Cell article shows first evidence for targeting of Pol I as new approach to cancer therapy
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Evidence contradicts idea that starvation caused saber-tooth cat extinction
(Date:11/7/2014)... Auguste, associate professor, biomedical engineering, in the Grove ... New York, have identified a molecule that could ... most aggressive forms of breast cancer. , Triple ... rate owing to aggressive proliferation and metastasis and ... Auguste,s team, discovered the overexpression of intercellular adhesion ...
(Date:11/7/2014)... November 6, 2014 Leading Biometric companies ... mobile security revolutionizing online transactions.  Companies in focus today are: ... (NYSE: BABA ), Google Inc. (NASDAQ: ... Inc. (NASDAQ: EBAY ) and MasterCard Inc. (NYSE: ... and NXTDW), a biometric authentication company focused on the growing ...
(Date:11/6/2014)... Most cancer deaths occur because of metastasis, yet ... has been slow. , "It,s been particularly challenging ... Taran Gujral, research fellow in systems biology at ... aren,t detected until after they,ve already metastasized." , ... culprit that should help researchers better understand how ...
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 6Migration negation 2Migration negation 3
... lizard,s tolerance to cold is stiffer than scientists had suspected. ... Anolis cristatellus has adapted to the cooler winters ... be able to tolerate temperature variations caused by climate change. ... a problem for lizards. It is a major problem. However, ...
... there,s life even in brine beneath 60 feet of ... Lake Vida, located in the northernmost of the McMurdo Dry ... it is home to some newly discovered hearty microbes. In ... Academy of Sciences , Nathaniel Ostrom, Michigan State University zoologist, ...
... the brain called the orbitofrontal cortex is responsible for decisions ... made based on prior experience or habit, according to a ... University of Maryland School of Medicine and the National Institute ... area of the brain was responsible for both types of ...
Cached Biology News:Rapid changes in climate don't slow some lizards 2Hearty organisms discovered in bitter-cold Antarctic brine 2University of Maryland School of Medicine, NIH study pinpoints brain area's role in learning 2University of Maryland School of Medicine, NIH study pinpoints brain area's role in learning 3
(Date:11/18/2014)... 2014 Cirrascale Corporation ®, ... and rackmount computing infrastructure, today announced it will ... throughout its GPU-enabled blade server and high-performance workstation ... latest proprietary 80-lane Gen3 PCIe switch-enabled risers, the ... K80 dual-GPU accelerator cards in a single blade, ...
(Date:11/18/2014)... 18, 2014 American Process Inc. ... formed a partnership with researchers at Georgia Institute ... Technology, and the USDA’s Forest Products Laboratory to ... nanocellulose. Nanocellulose is a rapidly emerging high performance ... project is to replace heavy steel structures within ...
(Date:11/18/2014)... Nov. 18, 2014 PDL BioPharma, Inc. (PDL) ... connection with the acquisition of Durata Therapeutics, Inc. by ... with the termination of PDL,s credit agreement with Durata, ... of $40 million, accrued interest, and prepayment and change ... a structured financing transaction with Durata in which PDL ...
(Date:11/17/2014)... (PRWEB) November 17, 2014 The ... Microgram Weights " describes the challenges of becoming ... achieve accredited status for calibration weights in the ... laboratories, weight manufacturers and any scientists involved in ... of design, handling, manufacturing and calibration of weights ...
Breaking Biology Technology:Cirrascale® Expands Multi-GPU Peering Solutions with Support for New NVIDIA Tesla K80 Dual-GPU Accelerators 2Cirrascale® Expands Multi-GPU Peering Solutions with Support for New NVIDIA Tesla K80 Dual-GPU Accelerators 3American Process Inc. Announces Partnership to Develop Ultra-Strong, Lightweight Automotive Components Using Nanotechnology from Nature 2American Process Inc. Announces Partnership to Develop Ultra-Strong, Lightweight Automotive Components Using Nanotechnology from Nature 3PDL BioPharma Announces Successful Conclusion of Debt Financing Agreement with Durata Therapeutics 2New White Paper on Microgram Weights Describes How to Achieve Traceable Measurement Down to 0.05 Milligrams 2
... April 14 febit,today announced its newest miRNA ... has been released by the Wellcome Trust Sanger ... most up-to-date,scientific information for miRNA microarray experiments., ... in the,field of genomics access to the latest ...
... Neptune Technologies &,Bioressources Inc. ("Neptune") (NASDAQ.NEPT - TSX.V.NTB) ... 2008 third quarter and,nine-month period ended February 29, ... achieved., Sales volume grew by 22% in ... the three-month period ended February 28, 2007 and ...
... ES Vascular Ltd. announced,today that it has ... Aortic Stapler,(OAS) system for mechanical suturing technology of ... other aortic reconstructions, enabling,commercialization of the device in ... the OAS stapler is a unique device that,enables ...
Cached Biology Technology:febit First to Offer miRBase 11.0 Biochip 2Neptune Technologies & Bioressources Inc. reports third quarter results and update on strategic milestones 2Neptune Technologies & Bioressources Inc. reports third quarter results and update on strategic milestones 3Neptune Technologies & Bioressources Inc. reports third quarter results and update on strategic milestones 4ES Vascular Receives CE Mark for its First Aortic Stapler for End-to-End Anastomosis Between Synthetic Grafts and Aorta During Open Repair of Aortic Aneurysmal and Occlusive Disease 2
... PCRx Enhancer System is used ... to optimize PCR of problematic ... PCRX Enhancer Solution with 10X ... primer specificity broader magnesium concentration ...
... Immunogen: Synthetic peptide derived from ... junctophilin-2. Specificity: Specific for the ... controls: mouse skeletal muscle homogenates frozen ... Western blotting Immunohistochemistry(froz) ImmunofluorescenceStorage: Store at ...
Abin-2 (N-16)...
CLIM-2 (T-16)...
Biology Products: