Summer 2010 Bison Population Estimate Released
Contact: Al Nash, 307-344-2015
National Park Service
Yellowstone National Park
Yellowstone’s Summer 2010 Bison Population Estimate Released
Yellowstone National Park has completed its annual summer bison population abundance estimate.
The population is estimated to be 3,900 bison. The estimate is based on a series of aerial surveys conducted in June and July.
This year’s calf production represents 15 % of the population. Fifty-six percent of the bison are distributed across the Northern Range this summer, while the remainder are found in the Central Interior herd.
The population was estimated at 3,300 bison last summer; and at 3,000 adult and yearling bison in late winter. 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 habitat conditions encountered over the course of time.
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 www.ibmp.info/.
- www.nps.gov/yell -
Did You Know?
Some groups of Shoshone Indians, who adapted to a mountain existence, chose not to acquire the horse. These included the Sheep Eaters, or Tukudika, who used dogs to transport food, hides, and other provisions. The Sheep Eaters lived in many locations in Yellowstone.