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Environmental Management

, Volume 32, Issue 1, pp 152–169 | Cite as

Model-Based Assessment of Aspen Responses to Elk Herbivory in Rocky Mountain National Park, USA

  • Peter J. WeisbergEmail author
  • Michael B. Coughenour
Environmental Assessment

Abstract

In Rocky Mountain National Park (RMNP), aspen (Populus tremuloides Michx.) has been observed to be declining on elk (Cervus elaphus nelsoni) winter range for many decades. To support elk management decisions, the SAVANNA ecosystem model was adapted to explore interactions between elk herbivory and aspen dynamics. The simulated probability of successful vegetative regeneration for senescent aspen stands declines sharply when elk densities reach levels of 3–5 elk/km2, depending on model assumptions for the seasonal duration of elk foraging activities. For aspen stands with a substantial component of younger trees, the simulated regeneration probability declines more continuously with increasing elk density, dropping below 50% from densities at 8–14 elk/km2.At the landscape scale, simulated aspen regeneration probability under a scenario of extensive seasonal use was little affected by elk population level, when this level was above 300–600 elk (25%–50% current population) over the ca. 107 km2 winter range. This was because elk distribution was highly aggregated, so that a high density of elk occupied certain areas, even at low population levels overall. At approximately current elk population levels (1000–1200 elk), only 35%–45% of senescent aspen stands are simulated as having at least a 90% probability of regeneration, nearly all of them located on the periphery of the winter range. Successful management for aspen persistence on core winter range will likely require some combination of elk population reduction, management of elk distribution, and fencing to protect aspen suckers from elk browsing.

Keywords

Herbivory National park management Simulation models Ungulate population management Populus tremuloides Cervus elaphus Plant–animal interactions 

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Notes

Acknowledgements

We thank W. J. Ripple and two anonymous reviewers for providing helpful comments. W. Baker, T. Johnson, R. Monello, and F. Singer reviewed earlier versions of the manuscript. D. Barnett, G. Chong, M. Kaye, M. Khalkhan, R. Monello, C. Olmsted, M. Rock, W. Shepperd, F. Singer, T. Stohlgren and K. Suzuki provided critical data. This research was funded by Rocky Mountain National Park and EPA Project No. R827449-01-0.

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Copyright information

© Springer-Verlag New York, Inc. 2003

Authors and Affiliations

  1. 1.Mountain Forest Ecology Group, Department of Forest SciencesSwiss Federal Institute of Technology, ETH-Zentrum HG F21.5, CH-8092 ZurichSwitzerland
  2. 2.Natural Resource Ecology LaboratoryColorado State UniversityFort Collins, Collins, 80523-1499, USA

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