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:7/24/2014)... NEW YORK, NY (July 24, 2014) Scientists ... Research Institute are one step closer to creating ... from a patient,s own cells. , For ... stem (iPS) cells lines from skin samples of ... they developed an accelerated protocol to induce these ...
(Date:7/24/2014)... numbers have decreased by 45% on average over a ... reports a study on the impact of humans on ... enormous benefits invertebrates such as insects, spiders, crustaceans, slugs ... and pest control for crops, decomposition for nutrient cycling, ... in Science and led by UCL, Stanford ...
(Date:7/24/2014)... A new study has identified two factors that ... increase the production of highly qualified physics teachers. ... to champion physics teacher education in combination with ... initiatives remain viable. Science, Technology, Engineering and Math ... and the study points the way for institutions ...
Breaking Biology News(10 mins):NYSCF scientists 1 step closer to cell therapy for multiple sclerosis patients 2Invertebrate numbers nearly halve as human population doubles 2Invertebrate numbers nearly halve as human population doubles 3Creating sustainable STEM teacher preparation programs 2
... NeuralIQ, a developer of,cyber intelligence tools for information ... team, headed by the appointment of,Donnie Blanks as ... President of Sales and strategy for Perot,Systems, government ... the,company continues to advance its industry presence and ...
... Pa. -- A little known fungus tucked away in ... munch through the hardest of woods according to a ... could lead to innovative methods of controlling the invasive ... down plant biomass for generating biofuels. Microbes in ...
... Atlantic Ocean shows that hot, dry air associated with ... contributor to the quieter-than-expected 2007 hurricane season. Factors ... in a season, including El Nio, sea surface temperatures, ... [identify what agency made these forecasts; otherwise it might ...
Cached Biology News:NeuralIQ Expands Global Leadership Team, Names Donnie Blanks CEO 2NeuralIQ Expands Global Leadership Team, Names Donnie Blanks CEO 3Novel fungus helps beetles to digest hard wood 2Novel fungus helps beetles to digest hard wood 32007 hurricane forecasts took blow from winds and Saharan dry, dusty air 22007 hurricane forecasts took blow from winds and Saharan dry, dusty air 3
(Date:7/24/2014)... at the University of Delaware, is known worldwide ... engineering, environmental sustainability and electronics. , His early ... a well-defined, crystalline structure. At the atomic scale, ... zeolites can separate molecules with size differences of ... a nanometer), making them useful to the chemical ...
(Date:7/24/2014)... Livermore, California (PRWEB) July 24, 2014 ... due to advances in modeling lithium-ion battery storage ... could benefit from a theoretical model created at ... Rice University that predicts how carbon components ... for energy storage emphasizes the urgent need for ...
(Date:7/24/2014)... 24, 2014 2014 Deep Research ... is a professional and in-depth research report on ... Sulphate basic information, including its definition, classification, ... This research covers the international market analysis, including ... analysis covering macroeconomic environment & economic situation analysis, ...
(Date:7/24/2014)... July 24, 2014 The first part ... Escalation in First in Human Studies” will cover comprehensive ... go/no-go decisions. , With increasing R&D costs and declining ... need to maximize the knowledge collected in early Phase ... improve success in late stage development. , Next, the ...
Breaking Biology Technology:University of Delaware researcher describes new approach for creating organic zeolites 2Getting More Life out of Lithium-ion Batteries 2Potassium Sulphate Market & SHMP Industry 2014 (Global, China) Analysis Now Available at DeepResearchReports.com 2Potassium Sulphate Market & SHMP Industry 2014 (Global, China) Analysis Now Available at DeepResearchReports.com 3Potassium Sulphate Market & SHMP Industry 2014 (Global, China) Analysis Now Available at DeepResearchReports.com 4Best Practices for Optimizing Dose Escalation in First in Human Studies, New Webinar August 6th Hosted by Xtalks 2
... Project supported by Department of Defense program , ... laser manufacturer, recently demonstrated 65 percent total power conversion ... conference in Albuquerque, N.M. This step toward the eventual ... Defense Advanced Research Projects Agency s Super ...
... was the word of the day last Thursday at ... of business representatives from across Wisconsin told the tales ... With a broad spectrum of industries represented, ranging from ... of how radio frequency identification technology could be tailored ...
... to be over. , ,You dont believe me, you say? Well, ... chorus of Happy Days Are Here Again before I remind you ... evidence proclaims that Wisconsins economy is back. Consider the following: , ... down from 5.1 percent in April. Statistics collected by the state ...
Cached Biology Technology:Alfalight increases laser efficiency for DOD program 2Upgrading your business with RFID 2Upgrading your business with RFID 3The economy has come roaring back or is that roar just a purr? 2The economy has come roaring back or is that roar just a purr? 3
Rabbit polyclonal to XPC ( Abpromise for all tested applications). Antigen: Synthetic peptide from N-terminus of Human XPC conjugated to a carrier protein Entrez Gene ID: 7508 Swiss ...
Chicken polyclonal to HADHSC - Azide free ( Abpromise for all tested applications). Antigen: Amino acids 57-314 of HADHSC Entrez GeneID: 3033 Swiss Protein ID: Q16836...
Rabbit polyclonal to FANCG ( Abpromise for all tested applications). Antigen: Synthetic peptide: MSRQTTSVGSSC, corresponding to amino acids 1 - 12 of Human FANCG. Entrez GeneID: 2189 Swis...
...
Biology Products: