Analysis of High-Elevation Wilderness Meadows to Inform Meadow Monitoring and Management of Pack Stock
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National Park Service U.S. Department of the Interior Natural Resource Stewardship and Science Data Analysis and Assessment of High Elevation Wilderness Meadows Surveyed from 2008 to 2011, Yosemite National Park Resources Management and Science Natural Resource Report NPS/YOSE/NRR—2014/926 ON THE COVER Photograph of Dorothy Lake Meadow, July 2010. Photograph courtesy of the National Park Service. Data Analysis and Assessment of High Elevation Wilderness Meadows Surveyed from 2008 to 2011, Yosemite National Park Resources Management and Science Natural Resource Report NPS/YOSE/NRR—2014/926 Tim J. Kuhn National Park Service, Yosemite National Park Resources Management and Science 5083 Foresta Road El Portal, California 95318 Liz Ballenger National Park Service, Sequoia and Kings Canyon National Parks Resources Management and Science P.O. Box 89 Sequoia National Park, California, 93262 Rick Scherer Conservation Science Partners 5 Old Town Square, Suite 205 Fort Collins, CO 80524 John N. Williams, Ph.D., Pacific Agroecology LLC Instituto Politécnico Nacional, CIIDIR-Unidad Oaxaca Hornos No. 10, Col. Noche Buena Santa Cruz Xoxocotlán 71230 Oaxaca, Mexico February 2015 U.S. Department of the Interior National Park Service Natural Resource Stewardship and Science Fort Collins, Colorado The National Park Service, Natural Resource Stewardship and Science office in Fort Collins, Colorado, publishes a range of reports that address natural resource topics. These reports are of interest and applicability to a broad audience in the National Park Service and others in natural resource management, including scientists, conservation and environmental constituencies, and the public. The Natural Resource Report Series is used to disseminate comprehensive information and analysis about natural resources and related topics concerning lands managed by the National Park Service. The series supports the advancement of science, informed decision-making, and the achievement of the National Park Service mission. The series also provides a forum for presenting more lengthy results that may not be accepted by publications with page limitations. All manuscripts in the series receive the appropriate level of peer review to ensure that the information is scientifically credible, technically accurate, appropriately written for the intended audience, and designed and published in a professional manner. This report received formal peer review by subject-matter experts who were not directly involved in the collection, analysis, or reporting of the data. Views, statements, findings, conclusions, recommendations, and data in this report do not necessarily reflect views and policies of the National Park Service, U.S. Department of the Interior. Mention of trade names or commercial products does not constitute endorsement or recommendation for use by the U.S. Government. This report is available in digital format from Yosemite National Park website (http://www.nps.gov/yose/naturescience/meadows.htm), and the Natural Resource Publications Management website (http://www.nature.nps.gov/publications/nrpm/). To receive this report in a format optimized for screen readers, please email [email protected]. Please cite this publication as: Kuhn, T. J., L. Ballenger, R. Scherer, and J. N. Williams. 2015. Data analysis and assessment of high elevation wilderness meadows surveyed from 2008 to 2011; Resource management and science, Yosemite National Park. Natural Resource Report NPS/YOSE/NRR—2014/926. National Park Service, Fort Collins, Colorado. NPS 104/128094, February 2015 ii Contents Page Figures................................................................................................................................................... iv Tables ..................................................................................................................................................... v Appendices ........................................................................................................................................... vii Executive Summary ............................................................................................................................viii Acknowledgments ...............................................................................................................................xiii 1. Introduction ...................................................................................................................................... 14 1.1 Sierra Nevada meadows: characteristics and importance....................................................... 15 1.2 Meadow ecological condition ................................................................................................. 15 1.3 Pack stock use and meadows .................................................................................................. 17 1.4 Meadow vulnerability to use-related disturbance ................................................................... 20 1.5 Management context: suitability for use and meadows-of-concern ....................................... 21 2. Methods ............................................................................................................................................ 23 2.1 Study Area and Meadow Selection ........................................................................................ 23 2.2 Field sampling ........................................................................................................................ 25 2.3 Data Analysis Procedures ....................................................................................................... 30 3. Results .............................................................................................................................................. 41 3.1 Summary Scores—ecological condition, vulnerability to disturbance, and use- related disturbance ........................................................................................................................ 41 3.2 Relationships among scores and use levels ............................................................................ 51 3.3 Management context: Suitability for use and meadows-of-concern ...................................... 54 4. Discussion ........................................................................................................................................ 57 4.1 Use of metrics and summary scores to prioritize monitoring ................................................. 57 4.2 Relationships among scores, reported stock use levels, and disturbance ............................... 58 4.3 Management context: suitability for use and meadows-of-concern ....................................... 59 4.4 Research needs and study limitations ..................................................................................... 61 5.0 Conclusion ..................................................................................................................................... 63 Literature Cited .................................................................................................................................... 64 iii Figures Page Figure 2-1. Locator map for study meadows in the Tuolumne Watershed of Yosemite National Park.. ..................................................................................................................................... 24 Figure 2-2. Locator map for study meadows in the Merced Watershed of Yosemite National Park.. ..................................................................................................................................... 24 Figure 3-1. Principal component analysis results for metrics in the meadow ecological condition assessment category. ............................................................................................................ 42 Figure 3-2. Principal component analysis results for metrics in the streambank ecological condition assessment category. ............................................................................................................ 43 Figure 3-3. Principal component analysis results for metrics in the vulnerability to disturbance assessment category. ......................................................................................................... 43 Figure 3-4. Principal component analysis results for metrics in the use-related disturbance assessment category. ............................................................................................................................ 44 Figure 3-5. Meadow ecological condition summary scores. ............................................................... 47 Figure 3-6. Streambank ecological condition summary scores. .......................................................... 48 Figure 3-7. Vulnerability to disturbance summary scores. .................................................................. 49 Figure 3-8. Use-related disturbance summary scores. ......................................................................... 50 Figure 3-9. Biplot of suitability for use ratings .................................................................................... 55 iv Tables Page Table 1-1. Factors driving ecological processes, function, and desired ecosystem services associated with meadow condition. ..................................................................................................... 16 Table 1-2. Corroborated and inferred relationships between pack