Kenner, M.C. Leischner, T.C. Collins, K.F. Miles, A.K. Myers, S.L. Randell, Z. Sanchez, K. Story, A.A. Tomoleoni, J.A. 2024 spreadsheet n/a U.S. Geological Survey data release https://doi.org/10.5066/P13TBWNZ Ryan E. Langendorf James A. Estes Jane C. Watson Michael C. Kenner Brian B. Hatfield M. Tim Tinker Ellen Waddle Megan L. DeMarche Daniel F. Doak 20250303 Publication Proceedings of the National Academy of Sciences (PNAS) Vol. 122, Issue 10 n/a Proceedings of the National Academy of Sciences https://doi.org/10.1073/pnas.2413360122 The monitoring program at San Nicolas Island (SNI) was conceived in anticipation of the potential reintroduction of southern sea otters to the island. Subtidal monitoring was initiated in autumn of 1980 at six sampling sites positioned around the island to sample communities exposed to a range of wave exposures and other oceanographic conditions. Three additional sites were subsequently added. Following their reintroduction in 1987, the sea otter population at the island remained low for several years but 154 were counted there in 2019. There are nine permanent sites that are monitored on rocky reefs around San Nicolas Island. Six of these (Nav Fac, West End Urchin, West End Kelp, West Dutch Harbor, East Dutch Harbor, and Daytona) were installed and first sampled in 1980. The two West End sites are physically joined, with the end bolt of the main 50 m transect of the Urchin site being also the beginning of the Kelp site’s main transect. The Dutch Harbor sites are not contiguous but are on adjacent rock reefs separated by approximately 140 m of sand. A seventh site, Sandy Cove, was added in 1986. Data collected from the project’s inception in October 1980 to October 2011 were published in Kenner et al. (2013). In fall 2014, two additional sites were added that are contiguous with two of the original sites. North Nav Fac was installed with the end of its main transect line sharing the beginning of the Nav Fac site and South Daytona was added in a similar relation to the Daytona Site. This yielded eight paired sites or four “supersites” in addition to Sandy Cove. Most of the data is collected separately on the individual sites but can be pooled at the larger supersite level. The original sites consisted of a 50-m main transect with five 10-m x 2-m benthic band transects (swaths), ten 1-m2 random point contact (RPC) quadrats and five 50-m fish transects. The two new sites do not have fish transects associated with them but are otherwise identical. Temperature data and sea urchin and other invertebrate size data are collected at the supersite level. Sites have usually been sampled twice a year, in spring and fall since their installation but have been missed several times due to weather, budgetary constraints, or mechanical issues with boats. References: Kenner, M.C., Estes, J.A., Tinker, M.T., Bodkin, J.L., Cowen, R.K., Harrold, C., Hatfield, B.B., Novak, M., Rassweiler, A. and Reed, D.C., 2013. A multi-decade time series of kelp forest community structure at San Nicolas Island, California. Ecological Archives E, 94(11), p.244. https://doi.org/10.1890/13-0561R.1 These data were collected as part of a long-term kelp forest ecosystem monitoring project. They provide the user an indication of the composition, persistence, and changes in populations of macroinvertebrates, macroalgae, and an invasive alga (Sargassum horneri) in the near-shore rocky community around San Nicolas Island, CA. 19800826 20191005 ground condition In work Irregular Naval Base Ventura County, San Nicolas Island, California -119.580100 -119.444100 33.273900 33.216000 ISO 19115 Topic Category biota oceans USGS Thesaurus marine biology invertebrates community ecology population and community ecology ocean temperature benthic ecosystems aquatic ecosystems fish Coastal and Marine Ecological Classification Standard Marine Nearshore Marine Nearshore Subtidal Attached Tunicates Attached Sea Urchins Benthic Macroalgae Benthic/Attached Biota Marine Realms Information Bank (MRIB) keywords kelp forest brown algae and kelp benthos invertebrates sponges gastropods mollusks sea anemones sea urchins and sand dollars fish starfish ray-finned fish ["bony fish"] cartilaginous fish USGS Metadata Identifier USGS:6709880bd34e969edc5a2d17 Common geographic areas San Nicolas Island Southern California Coastal California Northeast Pacific Pacific No access constraints. Please see 'Distribution Info' for details. No use constraints. Questions pertaining to appropriate use or assistance with understanding limitations or interpretation of the data are to be directed to the individuals/organization listed in the Point of Contact section. U.S. Geological Survey, Western Ecological Research Center Data Manager mailing address

3020 State University Drive, Modoc Hall, suite 4004

Sacramento CA 95819 US 279-782-0904 gs-b-werc_data_management@usgs.gov Thanks to the following for foresight, organizational support and/or diving assistance: James Estes, Tim Tinker, Chris Harrold, James Bodkin, and many volunteer divers. Thanks to the U.S. Navy for access to the island and funding from 2014 to present. Windows 10 MS Excel 365 SNI_1-meter_Counts.csv 539 kb GS ScienceBase U.S. Geological Survey mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. CSV https://doi.org/10.5066/P13TBWNZ None 20251203 Michael C Kenner U.S. Geological Survey, SOUTHWEST REGION Wildlife Biologist mailing address

2885 Mission Street

Santa Cruz CA 95060 US 831-254-5184 831-459-2249 mkenner@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999