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:8/31/2015)... 2015 Research and Markets ( http://www.researchandmarkets.com/research/st5b3m/saudi_arabia ) ... Biomedical Sensors Market - Growth, Trends & Forecasts (2014-2020)" ... Saudi Arabia Biomedical Sensors market is estimated at $0.23 ... the period 2014-2020 The near future will ... formulation of each individual. These sensors can be set ...
(Date:8/25/2015)... BELLEVUE, Wash. , Aug. 25, 2015  Sarcos ... today it will unveil its "Guardian S" snake robot, ... National Tactical Officers Association Conference on August 30 in ... is the first-ever commercially available energetically autonomous snake robot, ... in-field trials and is protected by more than 50 ...
(Date:8/20/2015)... 20, 2015 The wearable technology market ... active and healthy. However, wearable technology has the ... to help improve diagnostic capabilities and therapeutic outcomes. ... Wearable Technologies Conference 2015 , where ... wearables in healthcare.    "Over the ...
Breaking Biology News(10 mins):Saudi Arabia Biomedical Sensors Market Report 2015 - Growth, Trends & Forecasts (2014-2020) 2Sarcos to Debut First-of-its-Kind Snake Robot 2Sarcos to Debut First-of-its-Kind Snake Robot 3Leaf Healthcare Releases Video from Wearable Technology Conference on New Applications for Wearables in the Hospital Environment 2Leaf Healthcare Releases Video from Wearable Technology Conference on New Applications for Wearables in the Hospital Environment 3
... scientists at the Broad Institute of MIT and Harvard announced ... that can connect human diseases with potential drugs to treat ... human cells. Called the "Connectivity Map," the new tool and ... Science and in separate publications in the September 28 immediate ...
... your way through an unfamiliar neighborhood to a friend's ... is adept at adapting. It can make decisions based ... new information. , The nature of such sophisticated decision ... high-level processing, has been "poorly studied and little understood," ...
... sequence of a 5-million-year-old retrovirus and shown that it is ... ancestor of a large family of mobile DNA elements, some ... study, which is the first to generate an infectious retrovirus ... a breakthrough for the field of retrovirus research. The ...
Cached Biology News:Genetic 'roadmap' charts links between drugs and human disease 2Genetic 'roadmap' charts links between drugs and human disease 3Where we change our mind 2Scientists resuscitate a 5 million-year-old retrovirus 2
(Date:8/28/2015)... ... ... initial launch of FireflySci Inc. (FFS) in early 2015, the company continues to shake up ... the Fonz in a lab coat and Large Marge have been posted on the company’s ... , FireflySci is proud to be the only cuvette manufacturer is the world that has ...
(Date:8/27/2015)... 27, 2015  Neogen Corporation (NASDAQ: NEOG ) ... United Kingdom -based Lab M Holdings, ... and diagnostic systems. Lab M was ... provider of microbial testing and diagnostic products for the ... company currently sells into more than 70 countries worldwide, ...
(Date:8/27/2015)...  Asterias Biotherapeutics, Inc. (NYSE MKT: AST), a leading ... today announced that executives from the company will present ... , Pedro Lichtinger , Chief ... Annual Global Investment Conference on Wednesday, September 10, 2015 ... in New York City . ...
(Date:8/27/2015)... 2015 GlassesOff (OTCBB: GLSO), a visual ... the human vision system, announced today a partnership with eight-time ... Chris Paul to develop a new mobile app designed ... their real-life on-court performance. Vision is the inception ... shooting a ball or blocking a pass. The critical impact ...
Breaking Biology Technology:Cuvette Manufacturer FireflySci Launches Back to School Deals with Complimentary Shipping On All Orders 2Neogen acquires U.K.-based Lab M Holdings 2Asterias Biotherapeutics to Present at Upcoming Investor Conferences 2Eight-Time All-Star Chris Paul and GlassesOff Partner to Develop Innovative Mobile App Designed to Improve On-Court Performance 2Eight-Time All-Star Chris Paul and GlassesOff Partner to Develop Innovative Mobile App Designed to Improve On-Court Performance 3
... 2, 2011 /PRNewswire-Asia/ -- ShangPharma Corporation (NYSE: ... pharmaceutical and biotechnology research and development outsourcing company, today ... for the fourth quarter and full year 2010 ended ... host a conference call to discuss the results at ...
... – EMD Serono, Inc., an affiliate of Merck ... a complete response letter (CRL) from the U.S. ... drug application (NDA) for Cladribine Tablets, EMD Serono,s ... therapy for relapsing-remitting multiple sclerosis (MS). ...
... Communications , the team have created a microscope which shatters ... beating the diffraction limit of light. Previously, the standard ... 0.001 millimetres clearly. But now, by combining an ... the Manchester researchers can see 20 times smaller 50 ...
Cached Biology Technology:ShangPharma Corp. to Announce Fourth Quarter and Full Year 2010 Financial Results on March 15, 2011 2EMD Serono Receives Complete Response Letter From FDA on Cladribine Tablets New Drug Application 2EMD Serono Receives Complete Response Letter From FDA on Cladribine Tablets New Drug Application 3EMD Serono Receives Complete Response Letter From FDA on Cladribine Tablets New Drug Application 4Microscope could 'solve the cause of viruses' 2