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:


(Date:12/7/2016)... According to a new market research report "Emotion Detection and Recognition Market ... Application Area, End User, And Region - Global Forecast to 2021", published by ... 2016 to USD 36.07 Billion by 2021, at a Compound Annual Growth Rate ... ... MarketsandMarkets Logo ...
(Date:12/6/2016)... Dec. 6, 2016  Zimmer Biomet Holdings, Inc. (NYSE and ... an offering of €500.0 million principal amount of its 1.414% ... of its 2.425% senior unsecured notes due 2026. ... on December 13, 2016, subject to the satisfaction of customary closing ... The Company intends to use ...
(Date:12/2/2016)... India , December 1, 2016 ... Authentication type (Fingerprint, Voice), Future Technology (Iris Recognition ... and Region - Global Forecast to 2021", published ... USD 442.7 Million in 2016, and is projected ... at a CAGR of 14.06%.      ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... Dec. 8, 2016  OncoSec Medical Incorporated ("OncoSec") ... DNA-based intratumoral cancer immunotherapies, today announced financial results ... "We are delivering on our commitment to ... ImmunoPulse® IL-12. We are pleased with the early ... trial, and we are focused on advancing our ...
(Date:12/8/2016)...  Biotheranostics today announced that new data will ... Cancer Index (BCI) in identifying which patients with ... for disease recurrence and might benefit from extended ... advancing the understanding of the value of BCI ... inform decisions related to patient treatment. These data ...
(Date:12/8/2016)... UK (PRWEB) , ... December 08, 2016 , ... ... precision light to control cells — optogenetics — is key to exciting advances ... of the art, spatially patterned light projected via free-space optics stimulates small, transparent ...
(Date:12/8/2016)... -- Oxford Gene Technology (OGT), The ... range with the launch of the SureSeq myPanel™ NGS Custom ... in familial hypercholesterolemia (FH). The panel delivers single nucleotide variation ... small panel and allows customisation by ,mix and match, of ... LDLR , P C SK9 , ...
Breaking Biology Technology:
Cached News: