[PDF] Beaver In Yellowstone National Park eBook

Author : Lyman Persico
Publisher :
Page : 87 pages
File Size : 12,1 MB
Release : 2006
Category : Beavers
ISBN :

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Studies how the beavers in Yellowstone have affected stream geomorphology in the park.

Author : Douglas W. Smith
Publisher :
Page : 12 pages
File Size : 19,9 MB
Release : 2012
Category : Aspen
ISBN :

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Despite Yellowstone National Park's (YNP) long history and well studied large mammals and vegetation, beavers (Castor canadensis), an important ecosystem driver, have received relatively little study. We summarize population surveys of beavers that began in 1921 and continued up to the present. The first surveys (1921 and 1923) were from the ground and conducted in a limited area in the northern portion (northern range; NR) of the park. Twenty-five colonies were found and beavers were considered abundant and using aspen (Populus tremuloides) and willow (Salix spp.) as a food source and building material. A follow up survey in 1953 found 6 NR sites, but none of the earlier sites from the 1920s were active and no aspen use was reported. Some locations were reported from the park interior. A limited ground survey was conducted in 1979-80. In 1988-89 and 1994 two incomplete, mostly ground surveys were conducted and estimated 71 and 44 colonies, respectively, in YNP. In 1996, 1998, 1999, 2001, 2003, 2005, 2007 and 2009 complete, park-wide aerial surveys were conducted and active colonies ranged from 44 (1996) to 127 (2007) with an increasing trend. Therefore, in a period of about 90 years (1920s?2000s) the beaver population in the northern portion of the park appears to have declined then increased probably because of a willow recovery.

Author : Douglas W. Smith
Publisher :
Page : 8 pages
File Size : 19,85 MB
Release : 1997
Category : Beavers
ISBN :

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"The number of active beaver (Castor canadensis) colonies in Yellowstone National Park was determined by aerial survey in late October and early November 1996. This was the first near-complete autumn aerial count of beavers in park history. Flying time for the survey was 14.9 house, plus 4 hours ferry time from Bozeman, Montana, for a total of 18.9 hours. Total number of beaver colonies with food caches was 49; three other sites had beaver sign (beaver dam or cutting) indicating that beavers were probably present, but no lodge or food cache was sighted. Ninety percent of the park's beavers were located in three areas: 1) the Yellowstone River southeast of Yellowstone Lake, 2) the Beechler area, and 3) creeks and rivers in the northwest corner of the park which included the Madison and Gallatin rivers, and Cougar, Campanula, and Gneiss creeks. There was only one beaver colony on Yellowstone's Northern Range. All colonies were associated with willow (Salix spp.)."--Page 1.

Author : Milton Philo Skinner
Publisher :
Page : 3 pages
File Size : 40,48 MB
Release : 1924
Category : Beavers
ISBN :

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This article is about a colony of beavers at Lava Creek in Yellowstone National Park.