Navigation Links
Wolves' top-down effect

Willow trees, riparian willow warblers and beaver dams once were bountiful in an area near the town of Banff, Alberta, Canada. But once wolves left this area, elk grew more plentiful, browsing heavily on young willows. Today, there is little trace of beavers, and sparrows have replaced the warblers in what is now a grassland meadow. These profound changes were driven by the absence of the wolf, a top predator. That's the compelling finding of the paper, "Human Activity mediates a Trophic Cascade caused by Wolves" that appears in the August issue of Ecology by Mark Hebblewhite (University of Alberta) and colleagues.

Top-down effects of predators are called trophic cascades. While studies have demonstrated this phenomenon in aquatic environments, the Hebblewhite et al study is one of the first terrestrial, large-scale studies that so clearly exemplifies the strong role played by a top predator.

In the mid-1980s, wolves naturally recolonized the Bow Valley of Banff National Park in Alberta, Canada. The nearby town of Banff has been steadily growing and prevented wolves from fully recovering in areas surrounding the town while wolves fully repopulated adjacent areas. Hebblewhite and his fellow researchers were able to examine the effects of wolf exclusion on elk--wolves' preferred prey--on plants such as willow, which are favored by the ungulates, and on other species that depend on the willow habitat.

Hebblewhite and his colleagues found that in the low-wolf area of Bow Valley elk populations were 10 times as high as in the high-wolf area.

"We also found that as elk populations climbed, active beaver lodges declined, probably because beavers could no longer find sufficient trees with which to build their dams," says Hebblewhite.

In addition, songbirds, such as the American Redstart, which is strongly dependent on willow, also vanished from the wolf-excluded area.

Although the presence of people in the Bow Valley area also
'"/>

Source:Ecological Society of America


Page: 1 2

Related biology news :

1. Asleep in the deep: Model helps assess ocean-injection strategy for combating greenhouse effect
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Wolves top down effect

(Date:12/19/2014)... Dec. 18, 2014   LaunchKey , the first ... post-password and Internet of Things era, today announced the ... venture round was led by Metamorphic Ventures with participation ... Partners, VegasTechFund, and others.  LaunchKey has raised $4 million ... expand its team and bring LaunchKey to market in ...
(Date:12/17/2014)... NEW YORK , Dec. 15, 2014 /PRNewswire-USNewswire/ ... a Good Clinical Practices (GCP) audit to confirm ... Administration (FDA) regulations. This accomplishment enables HITLAB to ... trials utilizing the highest principles for patient safety ... to improve global healthcare access, quality, and delivery ...
(Date:12/17/2014)...  Automation is fundamentally transforming the travel experience ... international borders. Over the past decade, ePassports, biometric ... travelers to self process through border control via ... an increasing number of airports, seaports, and land ... to Maxine Most , Principal at Acuity ...
Breaking Biology News(10 mins):LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 2LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 3HITLAB Completes GCP Audit for FDA Smart Device & App Compliance 2Automated Border Control (ABC) Transforms the Global Travel Experience With More Than 2500 ABC eGates and APC Kiosks Deployed In Airports, Seaports, and Land Borders Worldwide 2
... that children smash to stain their cheeks purple-red and that ... be the key to spreading solar power across the globe, ... and Molecular Materials. Nanotech Center scientists have used the ... inexpensive fiber-based solar cells. The dye acts as an absorber, ...
... is available in German . 48 healthy males ... the start of the experiment, the other half a placebo. The ... in the form of a crying child, a girl hugging her ... to express the depth of feeling they experienced for the persons ...
... - Veterinary vision scientists at the University of Pennsylvania have ... class of photoreceptors of the retina called rods, a critical ... by rod degeneration. In this study, the ... to correct a DNA mutation, was not intended to treat ...
Cached Biology News:Purple Pokeberries hold secret to affordable solar power worldwide 2Hormone spray improves male sensitivity 2Gene therapy sets stage for new treatments for inherited blindness, Penn veterinary researchers say 2
(Date:12/22/2014)... 2014 GenomeDx Biosciences today announced that a ... a genomic test for prostate cancer, was able to ... by radical prostatectomy without adjuvant therapy. Although rapid metastasis ... using tumor genomics to identify these men who have ... important advance. The study has been published online ...
(Date:12/22/2014)... (PRWEB) December 22, 2014 Fertility Associates ... Donor Egg Bank USA , a network of more ... Through this partnership, patients have fast access to a ... vitro fertilization, IVF . Fertility Associates of Memphis is ... this fertility treatment option. , Dr. William Kutteh ...
(Date:12/19/2014)... , Dec. 19, 2014 Naurex Inc., ... novel drugs for diseases of the central nervous system, ... and chief executive officer, will present at the 33 ... presentation will take place at 3:00 p.m. PST on ... in San Francisco, Calif. ...
(Date:12/19/2014)... DUBLIN , Dec. 19, 2014 Research ... announced the addition of the "Technology Innovations ... their offering. http://photos.prnewswire.com/prnh/20130307/600769 ... Innovations in Smart Fabrics" offers a detailed assessment ... Key Findings: 1. ...
Breaking Biology Technology:Study Published in European Urology Shows that the Decipher Prostate Cancer Classifier is Predictive of Rapid Metastasis in High-Risk Men who have had Prostate Surgery 2Study Published in European Urology Shows that the Decipher Prostate Cancer Classifier is Predictive of Rapid Metastasis in High-Risk Men who have had Prostate Surgery 3Fertility Associates of Memphis Announces Partnership with Donor Egg Bank USA 2Fertility Associates of Memphis Announces Partnership with Donor Egg Bank USA 3Naurex to Present at 33rd Annual J.P. Morgan Healthcare Conference 2Technology Innovations in Smart Fabrics (Technical Insights) 2
... 25 Peptimmune, Inc., a privately held biotechnology company, ... the safety, tolerability, pharmacokinetics, and pharmacodynamics of PI-2301 in ... is a novel peptide copolymer for the treatment of ... The Phase Ib multiple-ascending dose, double-blind, placebo-controlled, ...
... ... - An Innovative Treatment for Multiple Sclerosis and Other Autoimmune Diseases , ... New York, NY/Rockville, MD (Vocus) ... the National Multiple Sclerosis Society,s subsidiary devoted to bridging the gap between research and ...
... JERUSALEM, August 25 Oramed Pharmaceuticals,Inc. (OTCBB: ORMP.OB) ... announced that it is the recipient of the 2009 ... , Oramed Pharmaceuticals is developing ... and vaccines delivered via injection. Oramed,focuses on the treatment ...
Cached Biology Technology:Peptimmune Completes Phase Ib Study of PI-2301 in Multiple Sclerosis Patients, and Presentation at ECTRIMS 2009 2Peptimmune Completes Phase Ib Study of PI-2301 in Multiple Sclerosis Patients, and Presentation at ECTRIMS 2009 3Fast Forward, LLC and Amplimmune, Inc. Join Forces to Speed New Treatments to People with MS** 2Fast Forward, LLC and Amplimmune, Inc. Join Forces to Speed New Treatments to People with MS** 3Fast Forward, LLC and Amplimmune, Inc. Join Forces to Speed New Treatments to People with MS** 4Frost and Sullivan Honors Oramed Pharmaceuticals With the 2009 European Oral Drug Delivery Technology Innovation Award 2Frost and Sullivan Honors Oramed Pharmaceuticals With the 2009 European Oral Drug Delivery Technology Innovation Award 3
Kinase Buffer can be used to assay protein kinase activity...
Goat polyclonal to SPFH2 ( Abpromise for all tested applications). Antigen: Synthetic peptide: EDEPLETATKEN, corresponding to C terminal amino acids 328-339 of Human SPFH2 Entrez Gene ID: 11...
Anti-Kusabira Orange Monoclonal Antibody Description: 100 g Research Focus: tag Storage: -20C Shipping Temperature: 4C...
alpha/beta-Tubulin Antibody Ship: Hot Store: -20 C...
Biology Products: