{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Julieta M Gomez-Fragoso", "hasEmail": "mailto:jgomez-fragoso@usgs.gov"}, "description": "This dataset contains tabulated-data of dissolved oxygen concentrations collected at Levittown Lake, Toa Baja, Puerto Rico. The standard light-dark method was used to determine the primary productivity in phytoplankton. The method consists in the in-situ incubation of two light-and-dark bottles for approximately four hours. Dissolved oxygen concentrations were estimated using the Winkler method. A total of twelve in-situ incubations were conducted on a monthly basis from April  2010 to June 2011. For each bottle incubated, two or three titrations were conducted and an average of the dissolved concentrations is calculated.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9MC6JZ6", "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.609b214ad34ea221ce37314a.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_609b214ad34ea221ce37314a", "keyword": ["Levittown", "Puerto Rico", "Salt Pond", "Toa Baja", "USGS:609b214ad34ea221ce37314a", "aquatic ecosystems", "biological production", "ecology", "phytoplankton", "planktonic ecosystems", "pond", "productivity (ecosystems)", "water-quality data"], "modified": "2022-11-29T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-66.20104, 18.44444, -66.17958, 18.47766", "theme": ["geospatial"], "title": "In-situ incubation of light-and-dark bottles for the estimation of phytoplankton productivity in Levittown Lake, Toa Baja, Puerto Rico"}