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:7/25/2014)... girls reach puberty is influenced by ,imprinted genes,a subset of ... gene. This is the first evidence that imprinted genes ... of this study were published today in the journal ... menarche, is a marker for the timing of puberty in ... varies between girls, is an inherited trait, and is linked ...
(Date:7/25/2014)... time, Spanish researchers have detected an unknown interaction between ... are introduced into a droplet of salt water and ... crystallisation to create biomineralogical biosaline 3D morphologically complex formations, ... bacteria are revived. The discovery was made by chance ... of the Astrobiology journal and may help ...
(Date:7/24/2014)... wildlife loss leads to conflict among people around the ... Society (WCS) Health & Ecosystems: Analysis of Linkages (HEAL) ... approach to tackle global biodiversity decline. , The harvest ... world,s people and provides protein for more than a ... no surprise that today,s unprecedented loss of wildlife, is ...
Breaking Biology News(10 mins):Could age of first period influence development of diseases in older women? 2Bacteria manipulate salt to build shelters to hibernate 2New study draws links between wildlife loss and social conflicts 2
(Date:7/24/2014)...  Now available is a stem cell therapy that ... , located in Guadalajara, Mexico , ... new health option: stem cell therapies for sports ... suffer from joint and muscle injuries due to professional ... rotator cuff, tennis elbow, and knee injuries. Throughout life ...
(Date:7/24/2014)... Security forces worldwide rely on sophisticated equipment, trained ... other public areas against terrorist attacks. A revolutionary ... about to make their job much easier. , ... Patolsky of Tel Aviv University ,s School of ... developed by the Herzliya company Tracense, picks up ...
(Date:7/24/2014)... Yan, Distinguished Professor of Engineering at the University ... to solve problems in energy engineering, environmental sustainability ... on zeolites, porous rock with a well-defined, crystalline ... is so precisely decided that zeolites can separate ... of an angstrom (one-tenth of a nanometer), making ...
(Date:7/24/2014)... -- Research and Markets has announced the ... Instruments Market 2014-2018" report to their offering. ... is the study of the gene and its functions ... functions of proteomes or sets of proteins by using ... the mapping of genes and DNA sequencing to understand ...
Breaking Biology Technology:Stem Cells In Sports Injuries, Joints And Muscular Pain 2Stem Cells In Sports Injuries, Joints And Muscular Pain 3Nano-sized chip 'sniffs out' explosives far better than trained dogs 2University of Delaware researcher describes new approach for creating organic zeolites 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 2
Cached News: