HOME >> BIOLOGY >> NEWS
Presence of wolves allows aspen recovery in Yellowstone

CORVALLIS, Ore. The wolves are back, and for the first time in more than 50 years, young aspen trees are growing again in the northern range of Yellowstone National Park.

The findings of a new study, just published in Biological Conservation, show that a process called the ecology of fear is at work, a balance has been restored to an important natural ecosystem, and aspen trees are surviving elk browsing for the first time in decades.

The research, done by forestry researchers at Oregon State University, supports theories about trophic cascades of ecological damage that can be caused when key predators in this case, wolves are removed from an ecosystem, and show that recovery is possible when the predators are returned. The results are especially encouraging for the health of Americas first national park, but may also have implications for other areas of the West and other important predators.

After an absence of 70 years, wolves were re-introduced to Yellowstone Park in 1995, and elk populations began a steady decline, cut in half over the past decade. Also, the presence of a natural predator appears to have altered the behavior of the remaining elk, which in their fear of wolves tend to avoid browsing in certain areas where they feel most vulnerable. The two factors together have caused a significant reduction in elk browsing on young aspen shoots, allowing them to survive to heights where some are now above the animal browsing level.

This is really exciting, and its great news for Yellowstone, said William Ripple, a professor in the OSU College of Forestry. Weve seen some recovery of willows and cottonwood, but this is the first time we can document significant aspen growth, a tree species in decline all over the West. Weve waited a long time to see this, but now were optimistic that things may be on the right track.

The study found significant numbers of aspen, especially in streamside riparian zones, tha
'"/>

Contact: William Ripple
bill.ripple@oregonstate.edu
541-737-3056
Oregon State University
26-Jul-2007


Page: 1 2 3

Related biology news :

1. Specialized, bone-crushing wolves of Alaska disappeared long ago
2. Ice Age extinction claimed highly carnivorous Alaskan wolves
3. Researchers determine why wolves not dispersing as fast as expected in Yellowstone
4. Contagious cancer in dogs confirmed; origins traced to wolves centuries ago
5. Killing wolves may not protect livestock efficiently
6. Gray wolves maintain the food chain in winter
7. The lost genetic legacy of American gray wolves
8. Cannibalism of the young allows individual fish to specialize
9. Social tolerance allows bonobos to outperform chimpanzees on a cooperative task
10. Expedition allows teachers to participate in polar research
11. Remarkable physiology allows crucian carp to survive months without oxygen

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Presence wolves allows aspen recovery Yellowstone

(Date:7/24/2014)... -- Keryx Biopharmaceuticals, Inc. (Nasdaq:KERX) (the "Company") announced the ... Phase 3 study of Zerenex (ferric citrate), the Company,s ... of hyperphosphatemia in patients with end-stage renal disease (ESRD) ... delivery with FErric CiTrate in EsrD) was published online ... of Nephrology ( JASN ). , ...
(Date:7/24/2014)... has different effects on different species of fish, ... of Bristol and Exeter which tested fish anti-predator ... a flying seagull predator model when exposed to ... European minnows. , Lead author Dr Irene ... "Noise levels in many aquatic environments have increased ...
(Date:7/24/2014)... own microbial terroir, meaning the microbial populations found on ... product, creating the final flavor according to research published ... Environmental Microbiology . This is the first time investigators ... , Many sake makers inoculate with both bacteria ... the University of California, Davis, but he and his ...
Breaking Biology News(10 mins):Zerenex™ (ferric citrate) long-term Phase 3 study results published in JASN 2Zerenex™ (ferric citrate) long-term Phase 3 study results published in JASN 3Zerenex™ (ferric citrate) long-term Phase 3 study results published in JASN 4The microbes make the sake brewery 2
(Date:7/24/2014)... to settle into equilibriuma state of unchanging balance ... of non-equilibrium conditions where new possibilities lie. Non-equilibrium ... such as temperature fluctuations, freezing and melting, or ... body temperature, airplanes to fly, and the Earth ... even though these conditions exist naturally and are ...
(Date:7/24/2014)... Research and Markets has announced ... Analytical Instruments Market 2014-2018" report to their offering. ... Genomics is the study of the gene and its ... and functions of proteomes or sets of proteins by ... involves the mapping of genes and DNA sequencing to ...
(Date:7/24/2014)... 2014 SRI International has been awarded a ... of Allergy and Infectious Diseases (NIAID), part of the ... potential therapies for HIV infection and AIDS. The contract ... AIDS and the complications and opportunistic infections associated with ... transmission of HIV. According to the ...
(Date:7/24/2014)... 2014 Three companies from the angelMD ... Big C Competition. Out of 700 competition entrants, Chiron ... the semi-final round. In this round twenty teams are ... complete with mentoring from thought-leaders and medical entrepreneurs from ... the angelMD commitment to the Livestrong vision around the ...
Breaking Biology Technology:New approach to form non-equilibrium structures 2Global Genomics and Proteomics Analytical Instruments Market 2014-2018: Key Vendors are Agilent, Bio-Rad , F. Hoffmann, La Roche, Illumina, PerkinElmer and Thermo Fisher Scientific 2National Institute of Allergy and Infectious Diseases Awards SRI International Contract to Study New Therapies for HIV and AIDS 2National Institute of Allergy and Infectious Diseases Awards SRI International Contract to Study New Therapies for HIV and AIDS 33 angelMD Startups Make Livestrong Big C Semi-finals 2
Cached News: