{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "U.S. Geological Survey, Western Ecological Research Center", "hasEmail": "mailto:gs-b-werc_data_management@usgs.gov"}, "description": "These data represent density per square meter of individuals of a suite of kelp and macroinvertebrate species on fixed 10-meter by 2-meter benthic transects on permanent subtidal monitoring sites around San Nicolas Island between 1980 and 2019. There are a total of nine sites, each of which has five 20 square meter band transects. Six of the sites were first sampled in 1980, one additional was added in 1987, and the other two were added in 2014. The sites have usually been monitored twice per year, most often in October and April. The target species list is as follows: \nStrongylocentrotus franciscanus (also known as Mesocentrotus franciscanus)\nStrongylocentrotus purpuratus\nApostichopus parvimensis\nPycnopodia helianthoides\nPatiria miniata\nPisaster giganteus\nAstrometis sertulifera\nDermasterias imbricata\nHaliotis corrugata\nHaliotis rufescens\nMegathura crenulata\nMegastraea undosa\nCystoseira osmundacea (also known as Stephanocystis osmundacea)\nEisenia arborea\nLaminaria spp.\nMacrocystis pyrifera <1 m tall\nMacrocystis pyrifera >1 m tall\nPterygophora californica\nYoung Laminariales (species uncertain)\nIn fall 2014, the following additional organisms were added to the target list:\nLytechinus anamesus\nKelletia kelletii\nCrassadoma gigantea\nAplysia californica \nTealia lofotensis (also known as Urticina eques)\nTethya aurantia (also known as Tethya aurantium)\nSargassum horneri", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P13TBWNZ", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.670993ded34e969edc5a2d42.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_670993ded34e969edc5a2d42", "keyword": ["Attached Sea Urchins", "Benthic Macroalgae", "California", "Northeast Pacific", "Pacific", "San Nicolas Island", "Southern California Coastal", "USGS:670993ded34e969edc5a2d42", "benthic ecosystems", "biota", "brown algae and kelp", "kelp forest", "sea urchins and sand dollars"], "modified": "2025-03-06T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-119.580100, 33.216000, -119.444100, 33.273900", "theme": ["geospatial"], "title": "San Nicolas Island benthic transect densities 1980-2019"}