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Rocky Intertidal Community Monitoring at Channel Islands National Park 2013 Annual Report

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Rocky Intertidal Community Monitoring at Channel Islands National Park 2013 Annual Report National Park Service U.S. Department of the Interior Natural Resource Stewardship and Science Rocky Intertidal Community Monitoring at Channel Islands National Park 2013 Annual Report Natural Resource Data Series NPS/MEDN/NRDS—2020/1305 The production of this document cost $100,113, including costs associated with data collection, processing, analysis, and subsequent authoring, editing, and publication. ON THE COVER Hermit crab (Pagurus samuelis) and anemone (Anthopleura sola) Photograph by: J. Altstatt Rocky Intertidal Community Monitoring at Channel Islands National Park 2013 Annual Report Natural Resource Data Series NPS/MEDN/NRDS—2020/1305 Stephen G. Whitaker National Park Service Channel Islands National Park 1901 Spinnaker Drive Ventura, CA 93001 December 2020 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 Data Series is intended for the timely release of basic data sets and data summaries. Care has been taken to assure accuracy of raw data values, but a thorough analysis and interpretation of the data has not been completed. Consequently, the initial analyses of data in this report are provisional and subject to change. 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 informal peer review by subject-matter experts who were not directly involved in the collection, analysis, or reporting of the data. Data in this report were collected and analyzed using methods based on established, peer-reviewed protocols and were analyzed and interpreted within the guidelines of the protocols. 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 the Mediterranean Coast Network website and the Natural Resource Publications Management website. If you have difficulty accessing information in this publication, particularly if using assistive technology, please email [email protected]. Please cite this publication as: Whitaker, S. G. 2020. Rocky intertidal community monitoring at Channel Islands National Park: 2013 annual report. Natural Resource Data Series NPS/MEDN/NRDS—2020/1305. National Park Service, Fort Collins, Colorado. NPS 159/173902, December 2020 ii Contents Page Figures................................................................................................................................................... iv Tables ..................................................................................................................................................viii Executive Summary .............................................................................................................................. ix Acknowledgments ................................................................................................................................ xii List of Acronyms ................................................................................................................................xiii Introduction ............................................................................................................................................ 1 Methods .................................................................................................................................................. 4 Study Area ...................................................................................................................................... 4 Monitoring ...................................................................................................................................... 4 Data Analysis................................................................................................................................ 11 Results and Discussion ........................................................................................................................ 12 Photoplots ..................................................................................................................................... 12 Motile Invertebrates...................................................................................................................... 42 Haliotis cracherodii...................................................................................................................... 42 Lottia gigantea.............................................................................................................................. 55 Pisaster ochraceus........................................................................................................................ 61 Phyllospadix spp. .......................................................................................................................... 69 Shorebirds and Pinnipeds ............................................................................................................. 74 Visitation ...................................................................................................................................... 80 Literature Cited .................................................................................................................................... 83 Appendix A. Program Notes .............................................................................................................. A-1 Appendix B. Trip Reports .................................................................................................................. B-1 iii Figures Page Figure 1. Rocky Intertidal Community Monitoring site locations in Channel Islands National Park. ........................................................................................................................................ 1 Figure 2. Dan Richards scoring photoplots at Ford Point, Santa Rosa Island. ..................................... 8 Figure 3. Stephen Whitaker measuring giant owl limpets at Otter Harbor, San Miguel Island. ..................................................................................................................................................... 9 Figure 4. Stephen Whitaker and Jessie Altstatt sampling a surfgrass transect at Trailer, Santa Cruz Island. ................................................................................................................................ 10 Figure 5. Percent cover of Mytilus californianus along with Phragmatopoma californica and bare rock in fixed plots within the Mytilus zone at each site in spring. ........................................ 13 Figure 6. Percent cover of Mytilus californianus along with Phragmatopoma californica and bare rock in fixed plots within the Mytilus zone at each site in fall. ............................................. 14 Figure 7. Departure from the long-term mean for Mytilus californianus. .......................................... 15 Figure 8. Departure from the long-term mean for Mytilus californianus. .......................................... 16 Figure 9. Percent cover of Silvetia compressa along with other dominant taxa and bare rock in fixed plots within the Silvetia zone at each site in spring. ....................................................... 17 Figure 10. Percent cover of Silvetia compressa along with other dominant taxa and bare rock in fixed plots within the Silvetia zone at each site in fall. ............................................................ 18 Figure 11. Departure from the long-term mean for Silvetia compressa.............................................. 19 Figure 12. Departure from the long-term mean for Silvetia compressa.............................................. 20 Figure 13. Percent cover of Hesperophycus californicus along with other dominant taxa and bare rock in fixed plots within the Hesperophycus zone at each site in spring. ............................ 21 Figure 14. Percent cover of Hesperophycus californicus along with other dominant taxa and bare rock in fixed plots within the Hesperophycus zone at each site in fall. ................................ 22 Figure 15. Departure from the long-term mean for Hesperophycus californicus. .............................. 23 Figure 16. Departure from the long-term mean for Hesperophycus californicus. .............................. 24 Figure 17. Percent cover of Endocladia along with other dominant taxa and bare rock in fixed plots within the Endocladia zone at each site in spring. ............................................................. 25 Figure 18. Percent cover of Endocladia along with other dominant taxa and bare rock in fixed plots within the Endocladia zone at each site in fall. ................................................................
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