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

In the period just before they went extinct, the American lions and saber-toothed cats that roamed North America in the late Pleistocene were living well off the fat of the land.

That is the conclusion of the latest study of the microscopic wear patterns on the teeth of these great cats recovered from the La Brea tar pits in southern California. Contrary to previous studies, the analysis did not find any indications that the giant carnivores were having increased trouble finding prey in the period before they went extinct 12,000 years ago.

The results, published on Dec. 26 in the scientific journal PLOS ONE, contradicts previous dental studies and presents a problem for the most popular explanations for the Megafaunal (or Quaternary) extinction when the great cats, mammoths and a number of the largest mammals that existed around the world disappeared.

"The popular theory for the Megafaunal extinction is that either the changing climate at the end of the last Ice Age or human activity or some combination of the two killed off most of the large mammals," said Larisa DeSantis, assistant professor of earth and environmental sciences at Vanderbilt, who headed the study. "In the case of the great cats, we expect that it would have been increasingly difficult for them to find prey, especially if had to compete with humans. We know that when food becomes scarce, carnivores like the great cats tend to consume more of the carcasses they kill. If they spent more time chomping on bones, it should cause detectable changes in the wear patterns on their teeth."

In 1993, Blaire Van Valkenburgh at UCLA published a paper on tooth breakage in large carnivores in the late Pleistocene. Analyzing teeth of American lions, saber-tooth cats, dire wolves and coyotes from La Brea, she found that they had approximately three times the number of broken teeth of contemporary predators and concluded, "...these findings suggest that these species u
'/>"/>

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:4/17/2014)... new early-warning signs of the potential loss of sight ... for the diagnosis and treatment of diabetic retinopathy, potentially ... "We had not expected to see such striking changes ... Elsner, professor and associate dean in the IU School ... set out to study the early signs, in volunteer ...
(Date:4/17/2014)... University of Texas Medical Branch at Galveston are ... with radiation for cervical cancer should begin colorectal ... The UTMB researchers, finding a high incidence of ... with radiation, offer new recommendations that the younger ... about eight years after their initial cervical cancer ...
(Date:4/17/2014)... way the immune system may fight cancers and viral ... cells to treat illness. , The research, in mice, ... "neighborhood police" specialized squads of defenders that patrol ... entire city, the body. , Scientists at Washington University ... the liver, skin and uterus each has dedicated immune ...
Breaking Biology News(10 mins):New technique detects microscopic diabetes-related eye damage 2New technique detects microscopic diabetes-related eye damage 3Radiation therapy for cervical cancer increases risk for colorectal cancer 2Some immune cells defend only 1 organ 2
... are invading the Great Lakes and changing the ecology of ... the March issue of the Journal of Great Lakes Research ... species, their ability to wrest territory from native fish plays ... , In the study, McMaster's Sigal Balshine, an assistant professor ...
... University's Pratt School of Engineering have created a new ... the probe creates a picture of the whole heart ... to image a single heart cross section. , The ... the condition of the heart, but also for use ...
... the brain and, more specifically, how nerve cells form billions of ... a scientific mystery. , A team headed by Drs. Robin Hiesinger ... have unraveled a piece of that puzzle by finding a gene ... their work appears today in the journal Neuron. , "We were ...
Cached Biology News:Duke engineers develop new 3-D cardiac imaging probe 2
(Date:1/15/2014)... Pittsburgh, PA (PRWEB) January 15, 2014 The ... Company, publisher of Food Safety Tech , an e-Journal ... has signed an agreement for the second year for the ... with Pittcon 2014. The partnership provides that the registration fee ...
(Date:1/15/2014)... Cynvenio, a cancer diagnostics company focused on ... of tumor cells in the bloodstream, today announced that ... support application powered by CollabRx, Inc. , Available ... Therapy Finder will provide breast cancer patients and their ...
(Date:1/15/2014)... 2014 This webinar will focus on ... safety assessment in biosimilars. , Regulatory frameworks are evolving ... development, however the complex nature of biopharmaceuticals makes the ... efficacy extremely challenging. Based on the specific aspects of ...
(Date:1/15/2014)... Reston, VA (PRWEB) January 15, 2014 ... education have continued their sponsorship of an annual competition ... interest in, and access to, innovative STEM study. The ... , TEAMS: Tests of Engineering Aptitude, Mathematics, and ...
Breaking Biology Technology:Pittcon Announces Second Year Partnership With Food Safety Tech 2Pittcon Announces Second Year Partnership With Food Safety Tech 3Cynvenio Offers New Breast Cancer Therapy Finder Application for its ClearID Breast Cancer Genomic Test 2Cynvenio Offers New Breast Cancer Therapy Finder Application for its ClearID Breast Cancer Genomic Test 3Xtalks Life Sciences Webinar Examines Safety Assessment of Biosimilars 2Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 2Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 3Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 4Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 5
... , , , ... MITI ) ("Micromet" or the "Company"), a biopharmaceutical company ... inflammation and autoimmune diseases, today announced the closing of ... common stock. Micromet also announced that the underwriters ...
... SHANGHAI, Aug. 4 /PRNewswire-Asia/ -- ... ShangPharma Corporation, announced,today that it has moved its drug ... ChemPartner will provide fully integrated,services in the areas of ... Members of the joint project team from both sides ...
... Nile Therapeutics, Inc. (Nasdaq: NLTX ), a company ... today announced dosing of its first patient in a Phase 2 ... acute heart failure. , , The single-blind, placebo-controlled ... safety and tolerability of CD-NP when infused for up to 72 ...
Cached Biology Technology:Micromet Closes $80.5 Million Public Offering of Common Stock 2Micromet Closes $80.5 Million Public Offering of Common Stock 3Micromet Closes $80.5 Million Public Offering of Common Stock 4Shanghai ChemPartner and ELARA Pharmaceuticals Expand Drug Discovery Collaboration to a New Level 2Nile Therapeutics, Inc. Announces Dosing of First Patient in Phase 2 Study of CD-NP for the Treatment of Acute Heart Failure 2Nile Therapeutics, Inc. Announces Dosing of First Patient in Phase 2 Study of CD-NP for the Treatment of Acute Heart Failure 3
Screening test for the detection of Salmonella sp. by means of DNA amplification, subsequent molecular hybridization and detection on a microtitre plate....
... General description: The "egg crate" style ... any Costar flat bottom strips. Linkage: This ... created to easily match Cornings product number. ... under the old Sigma-Aldrich number (Z71,456-9) or ...
... This reagent is intended for use as ... MTF). Michels Transport Fluid is useful for ... lymph nodes) for immunofluorescence studies. Samples may ... days at room temperature. Michels Transport Fluid ...
... Two sizes available for use with 96- or 384-well ... 96 for ease of location on 96-tube plates ... the skirt of the plate* Efficient sealing is ... in conjunction with screw or clip-down hot lid thermal ...
Biology Products: