Abstract
Big sagebrush (Artemisia tridentata Nutt.) occupies large portions of the western United States and provides valuable wildlife habitat. However, information is lacking quantifying differences in native perennial forb characteristics between mountain big sagebrush [A. tridentata spp. vaseyana (Rydb.) Beetle] and Wyoming big sagebrush [A. tridentata spp. wyomingensis (Beetle & A. Young) S.L. Welsh] plant communities. This information is critical to accurately evaluate the quality of habitat and forage that these communities can produce because many wildlife species consume large quantities of native perennial forbs and depend on them for hiding cover. To compare native perennial forb characteristics on sites dominated by these two subspecies of big sagebrush, we sampled 106 intact big sagebrush plant communities. Mountain big sagebrush plant communities produced almost 4.5-fold more native perennial forb biomass and had greater native perennial forb species richness and diversity compared to Wyoming big sagebrush plant communities (P < 0.001). Nonmetric multidimensional scaling (NMS) and the multiple-response permutation procedure (MRPP) demonstrated that native perennial forb composition varied between these plant communities (P < 0.001). Native perennial forb composition was more similar within plant communities grouped by big sagebrush subspecies than expected by chance (A = 0.112) and composition varied between community groups (P < 0.001). Indicator analysis did not identify any perennial forbs that were completely exclusive and faithful, but did identify several perennial forbs that were relatively good indicators of either mountain big sagebrush or Wyoming big sagebrush plant communities. Our results suggest that management plans and habitat guidelines should recognize differences in native perennial forb characteristics between mountain and Wyoming big sagebrush plant communities.
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Acknowledgments
The authors thank the summer field crews for assisting with data collection. The authors were also grateful for data management by Aleta Nafus and Georjanna Pokorney. Reviews of earlier versions of this manuscript by Ed Vasquez and Dave Ganskopp were greatly appreciated. The authors also thank the anonymous reviewers for providing constructive criticism and useful suggestions on this manuscript. The authors also thank Burns- and Lakeview-District Bureau of Land Management and the Hart Mountain National Antelope Refuge for providing land for this research project. Mike Gregg, Gail Collins, and Paul Steblein assistance in accessing intact big sagebrush on Hart Mountain National Antelope Refuge was greatly appreciated. This research was funded by the USDA–Agricultural Research Service at the Eastern Oregon Agricultural Research Center.
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Davies, K.W., Bates, J.D. Native Perennial Forb Variation Between Mountain Big Sagebrush and Wyoming Big Sagebrush Plant Communities. Environmental Management 46, 452–458 (2010). https://doi.org/10.1007/s00267-010-9530-2
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DOI: https://doi.org/10.1007/s00267-010-9530-2