• An aerial view of Old Faithful erupting taken from Observation Point with the Old Faithful Inn to the side.

    Yellowstone

    National Park ID,MT,WY

Yellowstone's Summer 2011 Bison Population Estimate Released

Subscribe RSS Icon | What is RSS
Date: August 16, 2011
Contact: Al Nash or Dan Hottle, (307) 344-2015

National Park Service
U.S. Department of the Interior

Yellowstone National Park
P.O. Box 168
Yellowstone National Park, WY 82190
 
FOR IMMEDIATE RELEASE
August 16, 2011           11-086
Al Nash or Dan Hottle (307) 344-2015

----------------------------------------------------
YELLOWSTONE NATIONAL PARK NEWS RELEASE
----------------------------------------------------

Yellowstone’s Summer 2011 Bison Population Estimate Released


Yellowstone National Park has completed its annual summer bison population abundance monitoring.

The population is estimated to be 3,700 bison. The estimate is based on a series of aerial surveys. There are an estimated 2,300 bison on the Northern Range this summer, with 1,400 in the Central Interior herd.

Winter mortality was estimated at 500 bison. There were 583 calves-of-the-year observed in a June aerial survey.

The population was estimated at 3,900 bison last summer. The peak population estimate of 5,000 bison was recorded in the summer 2005.  

The observed rate of population change this past year is within the natural range of expectation for wild bison. The rate at which wildlife populations increase in abundance is a reflection of the combined effects of reproduction and mortality, and is heavily influenced by age structure of the population, and environmental conditions encountered over the course of time.
 
This population estimate is used to inform adaptive management strategies under the Interagency Bison Management Plan (IBMP). Specific management actions may be modified based on expected late winter population levels as corroborated by the summer population estimate.
 
The IBMP is a cooperative plan designed to conserve a viable, wild bison population while protecting Montana’s brucellosis-free status.

The cooperating agencies operating under the IBMP are the National Park Service, the U.S. Forest Service, the Animal and Plant Health Inspection Service, the Montana Department of Livestock, the Montana Department of Fish, Wildlife and Parks, the InterTribal Buffalo Council, the Confederated Salish Kootenai Tribes, and the Nez Perce Tribe. More information on the IBMP can be found at http://ibmp.info.


- www.nps.gov/yell -


Twitter: @YellowstoneNPS
RSS Feed: http://www.nps.gov/feeds/getNewsRSS.htm?id=yell
----------------------------------------------------------
EXPERIENCE YOUR AMERICA (tm)
The National Park Service cares for special places saved by the American people so that all may experience our heritage.

Did You Know?

Summer Crowd at Old Faithful.

At peak summer levels, 3,500 employees work for Yellowstone National Park concessioners and about 800 work for the National Park Service.