{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Sarah E Janssen", "hasEmail": "mailto:sjanssen@usgs.gov"}, "description": "Methylmercury (MeHg) and total mercury (HgT) stable isotope measurements were made by the USGS Mercury Research Lab (MRL) in different organs on the Giant Petrels (Macronectes spp.) to examine internal mercury cycling in these seabirds. These data were collected as a compliment to x-ray spectroscopy measurements made by the University of Grenoble, France. The tissues and feathers of the southern giant petrels exhibit large variability in mercury-202 isotope values (\u03b4202HgT), which are typically used to ascertain Hg sources in the environment. These values follow a pattern across all individuals based on tissue type: feathers (\u03b4202HgT = 2.74 \u00b1 0.16\u2030, n =5, mean \u00b1 standard deviation) > brain (\u03b4202HgT = 1.09 \u00b1 0.77\u2030, n = 3)  > liver (\u03b4202HgT = 0.04 \u00b1 0.11\u2030, n = 5) > kidneys (\u03b4202HgT= 0.01 \u00b1 0.25\u2030, n = 5)> muscle (\u03b4202HgT = -0.80 \u00b1 0.23\u2030, n = 5). The \u03b4202HgT for liver tissues are within the range of literature data for seabirds (\u22120.64\u2030 < \u03b4202Hgl < 0.68\u2030), whereas \u03b4202Hg for feathers are modestly higher than those measured previously for seabirds (1.10\u2030 < \u03b4202Hgf < 2.35\u2030). Notably, muscle tissues exhibit considerably lower \u03b4202HgT values than liver tissues (on average 0.84\u2030), counter to observations to other birds and mammals, and were as much as ~\u22124\u2030 enriched in light isotopes compared to feathers. The \u03b4202MeHg values, associated with just the MeHg contents within the tissues, for organs and feathers were constrained between 0.90 and 3.05 \u2030 (n =9).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9UEG9Q1", "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.60a3e801d34ea221ce45b9cc.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_60a3e801d34ea221ce45b9cc", "keyword": ["Antarctica", "Kerguelen Islands", "USGS:60a3e801d34ea221ce45b9cc", "biochemistry", "food web", "isotopic analysis", "mercury contamination"], "modified": "2021-09-23T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "67.693176249275, -50.138465657489, 71.648254374118, -48.309065449085", "theme": ["geospatial"], "title": "Mercury and Methylmercury Stable Isotope Measurements in Giant Petrels"}