Navigation Links
'Trophic cascades' of disruption may include loss of woolly mammoth, saber-toothed cat
Date:6/30/2010

ds, and other life forms. When wolves were re-introduced to Yellowstone, studies are showing that those processes have begun to reverse themselves.

"We think the evidence shows that major ecosystem disruptions, resulting in these domino effects, can be caused either by subtracting or adding a major predator," Ripple said. "In the case of the woolly mammoths and saber-toothed tiger, the problems may have begun by adding a predator, in this case humans."

The new analysis draws on many other existing studies in making its case.

For instance, other research describes this process with a model in modern times in Alaska. There, the allowance of relatively limited human hunting on moose caused wolves to switch some of their predation to sheep, ultimately resulting in a precipitous decline in populations not only of moose but also wolves and sheep.

The loss of species in North America during the late Pleistocene was remarkable about 80 percent of 51 large herbivore species went extinct, along with more than 60 percent of important large carnivores. Previous research has documented the growth rates of North American mammoths by studying their tusks, revealing no evidence of reduced growth caused by inadequate food thus offering no support for climate-induced habitat decline.

It seems that diverse and abundant carnivores kept herbivore numbers below levels where food becomes limiting. By contrast, the large population of predators such as dire wolves and saber tooth cats caused them to compete intensely for food, as evidenced by heavy tooth wear.

"Heavily worn and fractured teeth are a result of bone consumption, something most carnivores avoid unless prey is difficult to acquire," says Van Valkenburgh.

Trophic cascades initiated by humans are broadly demonstrated, the researchers report. In North America, it may have started with the arrival of the first humans, but continues today with the extirpation of wolv
'/>"/>

Contact: William Ripple
bill.ripple@oregonstate.edu
541-737-3056
Oregon State University
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. University of Chicago launches research program in catastrophic deformation
2. Researchers call for nitrogen and phosphorus reductions to combat eutrophication in aquatic systems
3. UMMS researchers isolate first neuroprotective gene in patients with amyotrophic lateral sclerosis
4. Dirty snow causes early runoff in Cascades, Rockies
5. City birds better than rural species in coping with human disruption
6. Study shows how disruption of spectrin-actin network causes lens cells in the eye to lose shape
7. Stem-cell disruption induces skull deformity, UR study shows
8. Key to using local resources for biomass may include waste
9. Macadamia nuts can be included in heart healthy diet
10. The MDS Foundation supports the FDAs decision to expand vidaza label to include survival data
11. New book includes advances in the science and practice of transfusion and transplantation
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/11/2015)... According to a ... Product (Cards and Readers, Biometrics, Controllers, Management Software), ... Healthcare, Education) and By Geography - Global Forecast and Analysis to ... Control Market is expected to reach $10.4 ... of 10.6% between 2014 and 2020. ...
(Date:2/9/2015)...  Lintec of America recently announced an exclusive license ... macrostructures, including sheets, yarns and ribbons, developed at the ... the vast industrial resources of the global Lintec Group, ... of America is forming the Nano-Science and Technology Center ... on scaling up the manufacturing and commercialization of nano ...
(Date:2/5/2015)... , Feb. 5, 2015  Marken is starting ... company and has launched a new marketing campaign to ... Organization (CLO).  The new campaign focuses on First ... protocol and shipments. The first headline in ... aligns Marken,s priorities with its client,s priorities. Marken recognizes ...
Breaking Biology News(10 mins):Access Control Market Worth $10.4 Billion by 2020 2Access Control Market Worth $10.4 Billion by 2020 3Access Control Market Worth $10.4 Billion by 2020 4Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 2Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 3Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 4Marken Launches New Patient-Centric Campaign 2
... Maine Toxicity (GOMTOX) project issued an outlook for a significant ... tides, in the spring and summer of this year, potentially ... seed population in bottom sediments has set the stage for ... This organism swims in the water, and divides again and ...
... Bacteria in Cattle Manure May Survive Composting ... may actually survive the composting process. Researchers from Agriculture ... of the journal Applied and Environmental Microbiology ... and persist for long periods in the final product. ...
... The squirrels littering your lawn with acorns as they bound ... ones that aerate it with their burrows, according to a ... that flying birds and bats live longer than earthbound animals ... candidates in anthropology, decided to take a closer look at ...
Cached Biology News:Researchers issue outlook for a significant New England 'red tide' in 2010 2Researchers issue outlook for a significant New England 'red tide' in 2010 3Tips from the Journals of the American Society for Microbiology 2Tips from the Journals of the American Society for Microbiology 3Tips from the Journals of the American Society for Microbiology 4Tree-dwelling mammals climb to the heights of longevity 2
(Date:3/4/2015)... 4, 2015 Launched by ... in December 2011, ,SARAH, - the ... microspheres versus sorafenib in advanced hepatocellular carcinoma (HCC) has ...   SARAH, a large French study of ... or HCC) has completed patient enrolment, exceeding its 400-patient ...
(Date:3/3/2015)... DIEGO , March 3, 2015  Halozyme Therapeutics, Inc. ... Barclays 2015 Global Healthcare Conference in Miami, FL ... a.m. PT. David A. Ramsay , Chief Financial Officer, ... be webcast through the "Investors" section of Halozyme,s corporate website ... available for 90 days following the event. To access the ...
(Date:3/3/2015)... Mar. 03, 2015 Research and Markets ... "Gene Therapy Market, 2015 - 2025" report ... Market, 2015-2025" report provides an extensive study on the ... has been carried out in this field for over ... (four available in Asian markets; one approved in the ...
(Date:3/3/2015)... (PRWEB) March 03, 2015 ... Inc. to their international sales network. The business ... dissolution technology to Canada’s Atlantic Provinces, exclusively through ... served as one of Canada’s premiere manufacturing representative ... both the municipal water and wastewater markets. More ...
Breaking Biology Technology:Treatment of Primary Liver Cancer: SARAH Study Completes Enrolment, Results Expected Late 2016 2Treatment of Primary Liver Cancer: SARAH Study Completes Enrolment, Results Expected Late 2016 3Treatment of Primary Liver Cancer: SARAH Study Completes Enrolment, Results Expected Late 2016 4Treatment of Primary Liver Cancer: SARAH Study Completes Enrolment, Results Expected Late 2016 5Halozyme Therapeutics To Present At The Barclays 2015 Global Healthcare Conference 2Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 2Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 3Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 4Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 5Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 6Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 7BlueInGreen® Continues Canadian Expansion, Partners with Resource Systems Inc. 2
... Advanced Life Sciences Holdings, Inc. ... the discovery, development and commercialization of novel drugs in the ... that the Company has entered into a debt for equity ... Flavin , Ph.D.  Under the terms of the agreement, the ...
... LONDON , July 22, 2010 ... discovery and development, is,pleased to announce that it has augmented the strength ... DeCherney and Munir,Pirmohamed . With their extensive clinical, healthcare, and ... , , ...
... , July 21 Responding to a lack of voter ... bio-medical pioneer and mega-entrepreneur, today announced his intention to conduct a write-in ... , ... of Bioheart Inc., a biotechnology company, and owner of Leonhardt Vineyards ( ...
Cached Biology Technology:Advanced Life Sciences CEO Acquires $2 Million of Common Stock Through Debt for Equity Exchange 2Advanced Life Sciences CEO Acquires $2 Million of Common Stock Through Debt for Equity Exchange 3London Genetics Expands its Senior Advisory Team 2London Genetics Expands its Senior Advisory Team 3London Genetics Expands its Senior Advisory Team 4Howard J. Leonhardt Announces Candidacy for Governor of California 2Howard J. Leonhardt Announces Candidacy for Governor of California 3Howard J. Leonhardt Announces Candidacy for Governor of California 4
Excellent safety and durability., Remote control can be easily operated in your hand., Constant voltage control with 2 sets of terminals., Precise and durable circuit design. ...
Gel Loading Buffer contains a precipitant to ensure that the samples sink into the wells and a tracking dye to allow the user to follow the progress of electrophoresis....
Rabbit anti Xanthine Oxidase Xanthine Oxidase, Bovine Buttermilk...
Mouse polyclonal antibody to QPRT - quinolinate phosphoribosyltransferase (nicotinate-nucleotide pyrophosphorylase (carboxylating))...
Biology Products: