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    • Journal of Range Management, Volume 44 (1991)
    • Journal of Range Management, Volume 44, Number 5 (September 1991)
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    Grazing effects and range trend assessment on California bighorn sheep range

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    Author
    Wikeem, B. M.
    Pitt, M. D.
    Issue Date
    1991-09-01
    Keywords
    Ovis canadensis
    Ovis canadensis californiana
    community ecology
    British Columbia
    grasslands
    plant ecology
    species diversity
    ecological succession
    feces composition
    vigor
    plant communities
    shrubs
    botanical composition
    grazing
    grasses
    forage
    feeding preferences
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    Citation
    Wikeem, B. M., & Pitt, M. D. (1991). Grazing effects and range trend assessment on California bighorn sheep range. Journal of Range Management, 44(5), 466-470.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644721
    DOI
    10.2307/4002746
    Additional Links
    https://rangelands.org/
    Abstract
    This study investigated the effect of grazing by California bighorn sheep (Ovis canadensis californiana) on plant community structure. Over 28 months from 1977 to 1979, bighorn diet consisted of 79 species, including 14 grasses, 47 forbs and bryophytes, plus 18 trees and shrubs. Grasses, forbs, and shrubs comprised 66.6, 18.9, and 14.5% of the diet, respectively. Three years of bighorn sheep grazing reduced (P < 0.05) leaf and culm lengths of bluebunch wheatgrass (Agropyron spicatum (Pursh) Scribn. & Smith). Grazing generally reduced leaf length, basal diameter, culm (stem) length, and culm (stem) numbers of prairie Junegrass (Koeleria cristata Pers.), Sandberg's bluegrass (Poa sandbergii Vasey), needle-and-thread (Stipa comata Trin. & Rupr.), Thompson's paintbrush (Castilleja thompsonii Pennell), silky lupine (Lupinus sericeus Pursh), and snow buckwheat (Eriogonum niveum Dougl.). Vigor of arrowleaf balsamroot (Balsamorhiza sagittata (Pursh) Nutt.) was unaffected by grazing, despite its dietary importance. Total plant frequency remained unchanged between 1976 and 1983 in areas grazed by bighorn sheep, and in grazing exclosures. Total grass frequency declined from 46.5 to 30.8% within the exclosures, but increased from 44.7 to 48.8% in response to bighorn sheep grazing. Forb frequency remained unchanged after 7 years of bighorn sheep grazing while frequency of yarrow (Achillea millefolium L.) increased more inside exclosures than on the grazed area. Botanical composition of shrubs increased on grazed and ungrazed areas from 1976 to 1983, but frequency was unaffected by bighorn sheep grazing. Snow buckwheat and Wyeth buckwheat (Eriogonum heracleoides Nutt.) declined in response to bighorn sheep grazing. Successional trends caused by California bighorn sheep grazing differed from trends expected from cattle grazing.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002746
    Scopus Count
    Collections
    Journal of Range Management, Volume 44, Number 5 (September 1991)

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