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    • Rangeland Ecology & Management, Volume 67 (2014)
    • Rangeland Ecology & Management, Volume 67, Number 6 (November 2014)
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    Testing for Thresholds in a Semiarid Grassland: The Influence of Prairie Dogs and Plague

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    Author
    Augustine, D. J.
    Derner, J. D.
    Detling, J. K.
    Issue Date
    2014-11
    Keywords
    ecological sites
    grazing intensity
    resilience
    shortgrass steppe
    state-and-transition models
    western Great Plains
    
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    Citation
    Augustine, D. J., Derner, J. D., & Detling, J. K. (2014). Testing for Thresholds in a Semiarid Grassland: The Influence of Prairie Dogs and Plague. Rangeland Ecology & Management, 67(6), 701–709.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/656971
    DOI
    10.2111/REM-D-14-00032.1
    Additional Links
    https://rangelands.org/
    Abstract
    State-and-transition models for semiarid grasslands in the North American Great Plains suggest that the presence of herbivorous black-tailed prairie dogs (Cynomys ludovicianus) on a site 1) creates a vegetation state characterized by increased dominance of annual forbs and unpalatable bunchgrasses and increased bare soil exposure and 2) requires long-term (> 40 yr) prairie dog removal to transition back to a vegetation state dominated by palatable perennial grasses. Here, we examine 1) how the recent history of prairie dog occupancy on a site (1–10 yr) influences the magnitude of prairie dog effects on vegetation composition and 2) how occupancy history affects vegetation dynamics following extirpation of prairie dogs. We used a natural experiment in the shortgrass steppe of northeastern Colorado, USA, where prairie dogs were extirpated from multiple sites during an outbreak of epizootic plague. On sites occupied by prairie dogs for 1–4 yr prior to extirpation, plant cover and composition recovered to conditions similar to unoccupied sites within a single growing season. Larger reductions in perennial C4 grasses occurred on sites occupied for the prior 7–10 yr compared to sites with shorter occupancy histories (< 6 yr). On sites occupied for the prior 7–10 yr, C4 perennial grasses recovered after 5 yr following prairie dog extirpation; in addition, C3 perennial graminoids and forbs remained more abundant (compared to sites with no history of prairie dogs) throughout the 5-yr period. Our findings showcase that prior site occupancy (up to 10 yr) by prairie dogs did not induce irreversible shifts in vegetation state in this semiarid grassland. Rather, vegetation changes induced by prairie dogs represent primarily a phase shift in landscapes where prairie dog populations are regulated by epizootic plague. © 2014 Society for Range Management
    Type
    Article
    text
    Language
    en
    ISSN
    0022-409x
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-14-00032.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 67, Number 6 (November 2014)

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