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    • Rangeland Ecology & Management, Volume 62 (2009)
    • Rangeland Ecology & Management, Volume 62, Number 2 (March 2009)
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    Relationships Between Nutritional Condition of Adult Females and Relative Carrying Capacity for Rocky Mountain Elk

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    Author
    Piasecke, Jessica R.
    Bender, Louis C.
    Issue Date
    2009-03-01
    Keywords
    body fat
    Cervus elaphus nelsoni
    ecological carrying capacity
    habitats
    reproduction
    
    Metadata
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    Citation
    Piasecke, J. R., & Bender, L. C. (2009). Relationships between nutritional condition of adult females and relative carrying capacity for Rocky Mountain elk. Rangeland Ecology & Management, 62(2), 145-152.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643014
    DOI
    10.2111/07-020.1
    Additional Links
    https://rangelands.org/
    Abstract
    Lactation can have significant costs to individual and population-level productivity because of the high energetic demands it places on dams. Because the difference in condition between lactating and dry Rocky Mountain elk (Cervus elaphus nelsoni) cows tends to disappear as nutritional quality rises, the magnitude of that difference could be used to relate condition to habitat quality or the capability of habitats to support elk. We therefore compared nutritional condition of > 2.5-yr-old lactating and dry cows from six free-ranging Rocky Mountain elk populations throughout the United States. Our goal was to quantify differential accrual of body fat (BF) reserves to determine whether the condition of dry and lactating cows could be used to define relevant management thresholds of habitat quality (i.e., relative carrying capacity) and consequently potential performance of elk populations. Levels of BF that lactating cows were able to accrue in autumn and the proportional difference in BF between dry and lactating cows in autumn were related (F1-2, 10 > 16.2, P > 0.001). Models indicated that elk experienced no negative effects of reproduction on condition when lactating cows were able to accrue > 13.7% BF in autumn. When lactating cows are accruing < 7.9% BF, elk are in a nutritionally stressed condition, which may be limiting population performance. Using the logistic model to predict relative proximity to ecological carrying capacity (ECC), our population-years ranged from 3-97% of ECC and proportion of the population lactating (an index of calf survival) was negatively related to proportion of ECC. Results indicate that the proportional difference in accrual of BF between lactating and dry cows can provide a sensitive index to where elk populations reside relative to the quality of their range. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/07-020.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 62, Number 2 (March 2009)

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