{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Keith Bouma-Gregson", "hasEmail": "mailto:kbouma-gregson@usgs.gov"}, "description": "This dataset contains multiple types of data characterizing phytoplankton in the Sacramento-San Joaquin Delta (California, USA). 1) Bright field microscopy was used to identify and enumerate phytoplankton community composition; 2) Epifluorescent microscopy was used to enumerate picophytoplankton (phytoplankton cells < 2 microns in diameter) and, 3) a categorical visual index, Microcystis Visual Index (MVI), was used to rapidly estimate the abundance of Microcystis colonies near the surface. \nRevision History\nFirst release:  June 22, 2023\nRevision 1.1:  December 28, 2023\nRevision 2.0:  December 11, 2025", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P13L6RZD", "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.689b9185d4be0224e628ea75.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_689b9185d4be0224e628ea75", "keyword": ["Aquatic Biology", "California", "Central Valley", "Ecology", "Liberty Island", "Sacramento River", "Sacramento-San Joaquin Delta", "Suisun Bay", "USGS:689b9185d4be0224e628ea75", "United States", "Water Quality", "Water Resources", "algae", "biogeochemistry", "biota", "delta", "drinking water use", "environment", "high frequency", "high-resolution", "hydrogeology", "inlandWaters", "microcystin", "nutrient content (water)", "phytoplankton", "picophytoplankton", "public supply water use", "statistical analysis", "visualization methods", "water quality"], "modified": "2025-12-11T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-122.5336, 37.4199, -120.8037, 40.2880", "theme": ["geospatial"], "title": "Phytoplankton Species Composition and Abundance in the Sacramento-San Joaquin River Delta: Microscopic Enumeration of USGS Samples, beginning in 2016 (ver. 2.0, December 2025)"}