Navigation Links
Extinction of woolly mammoths may have been due to addition of a predator: Humans
Date:7/2/2010

The extinction of woolly mammoths and other large mammals more than 10,000 years ago may be explained by the same type of cascade of ecosystem disruption that is being caused today by the global decline of predators such as wolves, cougars and sharks, life scientists report July 1 in the cover article of the journal BioScience.

Then, as now, the cascading events were originally begun by human disruption of ecosystems, a new study concludes, but around 15,000 years ago the problem was not the loss of a key predator, but the addition of one human hunters with spears.

This mass extinction was caused by newly arrived humans tipping the balance of power and competing with major predators such as sabertooth cats, the authors of the new analysis argue. An equilibrium that had survived for thousands of years was disrupted, perhaps explaining the loss of two-thirds of North America's large mammals during this period.

"We suggest that the arrival of humans to North America triggered a trophic cascade in which competition for the largest prey was intensified, ultimately causing the large non-human carnivores to decimate the large herbivores," said Blaire Van Valkenburgh, UCLA professor of ecology and evolutionary biology and a co-author on the paper. "When human hunters arrived on the scene, they provided new competition with these carnivores for the same prey.

"The addition of humans was different from prior arrivals of new predators, such as lions, because humans were also omnivores and could live on plant foods if necessary," Van Valkenburgh said. "We think this may have triggered a sequential collapse not only in the large herbivores, but ultimately their predators as well. Importantly, humans had some other defenses against predation, such as fire, weapons and living in groups, so they were able to survive."

"For decades, scientists have been debating the causes of this mass extinction, and the two theories
'/>"/>

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

Page: 1 2 3

Related biology news :

1. Rosewood trees face extinction amid Madagascars chaos
2. Prehistoric frogs face extinction
3. Prehistoric fish extinction paved the way for modern vertebrates
4. Polygala balansae, a new bush to Europe, at risk of extinction in Spain
5. Madagascars radiated tortoise threatened with extinction
6. Aznalcóllar disaster compared with Cretaceous mass extinction
7. Coal from mass extinction era linked to lung cancer mystery
8. Paleontologists find extinction rates higher in open-ocean settings during mass extinctions
9. Is 80-year-old mistake leading to first species to be fished to extinction?
10. Volcanoes played pivotal role in ancient ice age, mass extinction
11. Clemson researchers say algae key to mass extinctionss
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... South Wales, Australia when NASA,s Aqua satellite passed overhead ... 11 (12:35 p.m. local time/11:35 p.m. EDT on July ... (NSW), the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard captured ... smoke (light brown) from various fires. Actively burning areas, ... , The New South Wales, Australia Government website "NSW ...
(Date:7/11/2014)... release is available in German . ... a method that uses the refraction of X-rays through ... images produced with this method are often of much ... in the team of Prof. Franz Pfeiffer are particularly ... and therapy including X-ray phase-contrast imaging. One main ...
(Date:7/11/2014)... Researchers from Salk Institute for Biological Studies, BGI, ... the safety and reliability of the existing targeted ... method, TALEN-HDAdV, which could significantly increased gene-correction efficiency ... study published online in Cell Stell Cell ... cell-based gene therapy. , The combination of stem ...
Breaking Biology News(10 mins):New simple setup for X-ray phase contrast 2A new genome editing method brings the possibility of gene therapies closer to reality 2
... may have just gotten a little louder. Researchers ... genes under control of in living things than suspected only ... model organism is dramatically higher than previously reported. The new ... "This new finding may help to explain why ...
... blasts in Hiroshima and Nagasaki, Japan, in 1945, likely ... thyroid cancer as adults, according to Japanese researchers. ... Research , a journal of the American Association for ... close to the blast sites, were comparably young at ...
... Researchers report the discovery of the first new living species ... to be published online on August 28th in Current ... that the new species, called Tridacna costata , once ... the Red Sea, it now represents less than one percent ...
Cached Biology News:Study shows more genes are controlled by biological clocks 2Study shows more genes are controlled by biological clocks 3Researchers discover atomic bomb effect results in adult-onset thyroid cancer 2New giant clam species offers window into human past 2
(Date:7/11/2014)... , July 11, 2014 , Not ... in, into or from any jurisdiction where to do so ... jurisdiction.  Shire plc ("Shire" or the "Company") (LSE: ... this afternoon.  Shire confirms it has held a meeting with ... by Shire without the prior agreement or approval of AbbVie. ...
(Date:7/11/2014)... , July 11, 2014 /CNW/ - Sunovion Pharmaceuticals Canada ... TM (eslicarbazepine acetate) for use as a once-daily ... patients with epilepsy who are not satisfactorily controlled with ... use in patients under 18 years of age. ... neurological disorders and according to Epilepsy Canada, it affects ...
(Date:7/10/2014)... Product and process impurities in biopharmaceuticals ... are often “lost in the noise,” making their ... Dr. Rowel Tobias, Senior Scientist, Protein Chemistry at ... Quality at Nanotherapeutics, Inc., to lear about a ... and quantitation while achieving the required specificity and ...
(Date:7/10/2014)... Unraveling life’s mysteries can intrigue, amaze, and ... purchased a DNA test to unravel the ... a lifetime of memories, sharing, and closeness. In fact, ... genuinely brought the family closer together. , Recently, ... history and prior to taking the genetic ancestry ...
Breaking Biology Technology:Shire plc - Statement re: Media Speculation 2Sunovion Pharmaceuticals Canada Inc. Announces Health Canada Approval of APTIOM(TM) (eslicarbazepine acetate) as a Once-Daily Adjunctive Treatment for Partial-Onset Seizures in Patients with Epilepsy 2Sunovion Pharmaceuticals Canada Inc. Announces Health Canada Approval of APTIOM(TM) (eslicarbazepine acetate) as a Once-Daily Adjunctive Treatment for Partial-Onset Seizures in Patients with Epilepsy 3Sunovion Pharmaceuticals Canada Inc. Announces Health Canada Approval of APTIOM(TM) (eslicarbazepine acetate) as a Once-Daily Adjunctive Treatment for Partial-Onset Seizures in Patients with Epilepsy 4Novel Ms Techniques Speed Detection of Biopharmaceutical Product and Process Impurities, New Webinar Hosted by Xtalks 2Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 2Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 3Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 4Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 5
... Inc. (Nasdaq: MYL ) today announced ... Biocon Limited, a publicly traded company on the ... the development, manufacturing, supply and commercialization of multiple, ... marketplace. Through this partnership, Mylan and Biocon bring ...
... June 29 , - Financing ... Gyros AB, the leading provider of ... SEK 80 million,(approximately euro 7.5 million) in an equity fundraising ... will enable Gyros to drive,the further commercialization of its Gyrolab ...
... , MENLO PARK, Calif., June 29 Kornberg Associates | ... Stanford University to design a new Cognitive & ... the announcement. The firm has worked with Stanford ... the past 30 years, one of which is the two-story, ...
Cached Biology Technology:Mylan Announces Strategic Collaboration with Biocon to Enter the Global Generic Biologics Market 2Mylan Announces Strategic Collaboration with Biocon to Enter the Global Generic Biologics Market 3Mylan Announces Strategic Collaboration with Biocon to Enter the Global Generic Biologics Market 4Gyros Raises SEK 80 Million to Accelerate the Commercialization of its Gyrolab(R) Systems for the Cost-Efficient Development of Biopharmaceuticals 2Gyros Raises SEK 80 Million to Accelerate the Commercialization of its Gyrolab(R) Systems for the Cost-Efficient Development of Biopharmaceuticals 3Gyros Raises SEK 80 Million to Accelerate the Commercialization of its Gyrolab(R) Systems for the Cost-Efficient Development of Biopharmaceuticals 4Kornberg Associates Architects Selected to Develop Design for New Stanford University Imaging Center 2
... system uses a burst of high-pressure ... acid-coated gold or tungsten microparticles to ... or organelles without dependence or interaction ... includes helium pressure regulator, solenoid, spacer ...
... system, 220-240 V, is used for ... The system includes the BioLogic LP ... MV-6 injection valve, proportioning valve or ... and fittings kit, column and conductivity ...
Sf21 Insect Cells (Frozen) in Max-XP Medium...
... have been developed for affinity capture ... variety of ProteinChip chemical surfaces allow ... their unique biochemical properties. Each chip ... sample comparison, and the chips are ...
Biology Products: