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:12/10/2014)... SAN DIEGO , Dec. 9, 2014 ... and collaboration catalyst that provides the connective tissue that ... by enabling them to easily share client-level information; earned ... Foundation to expand to organizations serving seniors aging in ... San Diego" partner on December 11 th 4-6p. ...
(Date:12/5/2014)...  Tute Genomics, a leader in cloud-based solutions for ... funding led by UK-based Eurovestech. Peak Ventures and a ... round. "We are at a pivotal time ... and seeks new approaches for the diagnosis, treatment and ... MBA, and CEO of Tute Genomics. "One of the ...
(Date:11/21/2014)... -- According to a new market research ... Access Control, Intrusion Detection, Parking Management, Under Vehicle Inspection), ... Geography - Global Forecasts to 2020", published by MarketsandMarkets, ... around $25 Billion in 2014 and is expected to ... of 8.69%. Browse 116 market data Tables ...
Breaking Biology News(10 mins):Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 2Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 3Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 4Tute Genomics Raises $2.3 Million to Scale Up Cloud-Based Genome Analytics and Accelerate Personalized Medicine 2Tute Genomics Raises $2.3 Million to Scale Up Cloud-Based Genome Analytics and Accelerate Personalized Medicine 3Industrial Security Systems Market Worth $38 Billion by 2020 2Industrial Security Systems Market Worth $38 Billion by 2020 3
... have shown great success in treating many patients with lung, ... resistance means that many other patients do not respond, and ... A new study from MIT reveals that much of ... cells to circumvent the effects of ErbB inhibitors, allowing them ...
... and the Academy of Science of South Africa are set ... cooperation agreement signed in Pretoria by Leopoldina President Professor Jrg ... Africa, Professor Daya Reddy. The Leopoldina has had ... South Africa for many years, and the 2012/2013 German-South African ...
... Ariz. Improved diagnosis for people afflicted with carpal tunnel ... hand is the goal of a research collaboration led ... a Mayo Clinic physician. Marco Santello and Mark Ross ... for Regenerative Medicine to advance their effort to quantify the ...
Cached Biology News:Why tumors become drug-resistant 2Why tumors become drug-resistant 3Leopoldina signs cooperation agreement with the Academy of Science of South Africa 2ASU-Mayo research project targets carpal tunnel syndrome diagnosis 2
(Date:12/24/2014)... Fla. , Dec. 23, 2014  Rock Creek ... that it has filed a Clinical Trial Application (CTA) ... Healthcare products Regulatory Agency (MHRA) seeking regulatory approval to ... lead molecule, Anatabine Citrate. Contingent on the ... conduct a Phase I trial to assess the safety, ...
(Date:12/22/2014)... , Dec. 22, 2014 /PRNewswire/ - RepliCel Life ... regenerative medicine company focused on the development of autologous ... out of the University of Calgary in conjunction with ... Carolina, which further validates the company,s ongoing clinical research ... effects of pattern baldness. The paper entitled ...
(Date:12/22/2014)... (PRWEB) December 22, 2014 ... peer-reviewed publication of original research, reviews and editorials ... and clinical practice, today published a provocative article ... the development, progression and potential treatment of prostate ... endocrinology research and proposes the possibility that there ...
(Date:12/19/2014)... Charm Sciences is pleased to announce that its ... M1 in raw commingled milk is the first lateral ... peer reviewed report of the validation by Technology and ... Fisheries Research (ILVO-T&V) has been published by the Taylor ... toxic aflatoxin and a known carcinogen, can be passed ...
Breaking Biology Technology:Rock Creek Pharmaceuticals Files Clinical Trial Application in the UK for Clinical Trials of Anatabine Citrate Formulations 2Rock Creek Pharmaceuticals Files Clinical Trial Application in the UK for Clinical Trials of Anatabine Citrate Formulations 3Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 2Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 3Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 4Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 5Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 2Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 3Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 4Charm Sciences Achieves Independent Validation of First 15 Minute Quantitative Screening Method for Aflatoxin M1 2
... week ago, 67 companies were nervously introducing their products ... executives, early adopters, and eager media. , ,DEMOfall 2006 ... flawless. John Patrick's FutureScan panels were smart. The buzz ... was glitch-free. , ,The DEMOgods smiled upon us ...
... including one from California, to stem cell patents held ... lack merit and underscore the need for serious patent ... of challenging patents, such as those held by WARF, ... the United States Patent and Trademark Office ...
... of a directive to provide $5 million in state funding ... state will provide $1 million in state loans and grants ... , ,Thomson, the University of Wisconsin-Madison professor who ... Stem Cell Products, Inc., and Cellular Dynamics International . ...
Cached Biology Technology:Basking (briefly) in the DEMOfall 2006 glow 2WARF challenges show need for patent reform 2WARF challenges show need for patent reform 3WARF challenges show need for patent reform 4State puts up $1 million for James Thomson's new stem cell startup 2State puts up $1 million for James Thomson's new stem cell startup 3
...
Request Info...
LECHNER AND LaVECK MEDIUMfor the clonal growth of normal human bronchial and other epithelial cells. Requires additives. With glutamine.Recommended storage condition:oC to 8oCIntended use(s):research...
The FliTrx Panning Kit is designed to simplify panning for protein-protein interactions with the FliTrx Random Peptide Display Library or the pFliTrx Peptide Display Vector....
Biology Products: