. The bison of Yellowstone National Park. American bison; Mammals. Habitat Relationships 107. Fig. 50. A bison trail, one in a network connecting the most-used parts of the Hayden Valley area. ations made of range conditions in Lamar, Pelican, and Hayden val- leys by the Soil Conservation Serv- ice (1963, 1964) indicated large areas of upland (usually steeper slopes and southwest exposures) in the poor and fair condition classes, producing less than 25% and 26- 50%, respectively, of potential or climax vegetation. Soil erosion and disturbance (particularly in Peli- can and Hayden valleys) by a
. The bison of Yellowstone National Park. American bison; Mammals. Habitat Relationships 107. Fig. 50. A bison trail, one in a network connecting the most-used parts of the Hayden Valley area. ations made of range conditions in Lamar, Pelican, and Hayden val- leys by the Soil Conservation Serv- ice (1963, 1964) indicated large areas of upland (usually steeper slopes and southwest exposures) in the poor and fair condition classes, producing less than 25% and 26- 50%, respectively, of potential or climax vegetation. Soil erosion and disturbance (particularly in Peli- can and Hayden valleys) by animal trampling and rodent activity was noted. Wetlands and subirrigated (a range classification term for some naturally occurring moist sites) lands were in good to excel- lent condition. The condition of these wintering valleys was attrib- uted to use by elk and, particularly in Pelican and Hayden valleys, to winter use by bison. An evaluation of the Firehole was not made by Soil Conservation personnel, but general observations indicated that essentially the same condi- tions prevailed. The effects which bison had on the vegetative cover of the winter ranges they inhabited, as the above surveys showed, were mostly con- fined to upland sagebrush-bunch- grass sites. Both the surveys and the present study indicated that the sedge-producing wet bottom- lands and swales showed little ef- fect. Observations made during the study indicated that bison use, particularly by mixed herd groups, occurred most frequently and for longer periods on these wet sites, which were the main source of forage. The condition of the less-used upland areas suggest- ed that these sites were particular- ly vulnerable to impact and might. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Meagher, Margaret Mary; United States. National Pa
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Keywords: ., bookauthorunitedstatesnatio, bookcentury1900, booksubjectmammals
