Original provider:\nNOAA Southeast Fisheries Science Center (NEFSC)\n\nDataset credits:\nNOAA Southeast Fisheries Science Center (SEFSC)\n\nAbstract:\nAs part of the Atlantic Marine Assessment Program for Protected Species (AMAPPS), the Southeast Fisheries Science Center (SEFSC) conducted a shipboard survey of the U.S. waters of the Western North Atlantic (WNA) from approximately the 200m isobath out to the U.S. Exclusive Economic Zone (EEZ). The survey was conducted between June 12 and September 5, 2021 onboard the NOAA Ship Gordon Gunter, split into three survey legs.\n\nDue to the COVID-19 pandemic, the scientific staff sheltered-in-place (SIP) before the start of the survey and before leg 3. Multiple days were lost due to mechanical problems with the ship and unfavorable weather conditions. The final portion of this survey transited through the Gulf of America (formerly Gulf of Mexico). The survey was designed for a two-team independent visual observer approach with distance sampling to estimate the detection probabilities for marine mammal sightings.\n\nA sighting constituted a single or group of marine mammals (whales and dolphins) seen at the same location and time. This dataset includes marine mammal visual observation data and effort points with surveying conditions that can be used in abundance and density modeling per visual line-transect survey protocols.\n\nThis dataset also includes opportunistic marine mammal photographs and non-marine mammal sightings such as sea turtles. Sea bird observers conducted counts of all birds detected within a 300m strip transect from the ship during all legs of the survey (see additional references and data below). The scientific echosounder (EK) recorded data during the nighttime from the end of the survey day until commencement of acoustic effort, the following morning (CIMAS, NOAA Southeast Fisheries Science Center, 2024). Environmental data was collected at predetermined stations using a conductivity, temperature, and depth sensor (CTD) unit (Wanninkhof, Sullivan, and Pierrot, 2021).\n
","language":"eng","homepage":"https://seamap.env.duke.edu/dataset/2373","citation":{"text":"Dias L, Garrison L, OBIS-SEAMAP (2026). NOAA Ship Gordon Gunter Vessel Line-transect Survey 2021 (GU2103). OBIS-SEAMAP. 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Debra; Garrison, Lance; Soldevilla, Melissa; Dias, Laura Aichinger; Rappucci, Gina. 2026. Cetacean visual observations using line-transect survey methods onboard the NOAA Ship Gordon Gunter (GU) during the Atlantic Marine Assessment Program for Protected Species (AMAPPS) in the Western North Atlantic Ocean (survey GU2103) from 2021-06-13 to 2021-09-04 (NCEI Accession 0309425). National Centers for Environmental Information. Dataset","identifier":"https://doi.org/10.25921/gwbg-7k67","citationProvidedBySource":false}],"curatorialUnits":[],"taxonomicCoverages":[{"description":"Scientific names are based on the Integrated Taxonomic Information System (ITIS).","coverages":[{"scientificName":"Balaenoptera","commonName":"Baleen whales","rank":{"verbatim":"genus","interpreted":"GENUS"}},{"scientificName":"Balaenoptera physalus","commonName":"Fin whale","rank":{"verbatim":"species","interpreted":"SPECIES"}},{"scientificName":"Caretta caretta","commonName":"Loggerhead sea turtle","rank":{"verbatim":"species","interpreted":"SPECIES"}},{"scientificName":"Cetacea","commonName":"Cetaceans","rank":{"verbatim":"order","interpreted":"ORDER"}},{"scientificName":"Cheloniidae","commonName":"Sea turtles","rank":{"verbatim":"family","interpreted":"FAMILY"}},{"scientificName":"Delphinidae","commonName":"Dolphins","rank":{"verbatim":"family","interpreted":"FAMILY"}},{"scientificName":"Delphinus 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novaeangliae","commonName":"Humpback whale","rank":{"verbatim":"species","interpreted":"SPECIES"}},{"scientificName":"Mesoplodon","commonName":"Beaked whales","rank":{"verbatim":"genus","interpreted":"GENUS"}},{"scientificName":"Mesoplodon densirostris","commonName":"Blainville's beaked whale","rank":{"verbatim":"species","interpreted":"SPECIES"}},{"scientificName":"Mesoplodon europaeus","commonName":"Gervais' beaked whale","rank":{"verbatim":"species","interpreted":"SPECIES"}},{"scientificName":"Mysticeti","commonName":"Baleen whales","rank":{"verbatim":"suborder","interpreted":"SUBORDER"}},{"scientificName":"Odontoceti","commonName":"Toothed whales","rank":{"verbatim":"suborder","interpreted":"SUBORDER"}},{"scientificName":"Orcinus orca","commonName":"Killer whale","rank":{"verbatim":"species","interpreted":"SPECIES"}},{"scientificName":"Physeter macrocephalus","commonName":"Sperm whale","rank":{"verbatim":"species","interpreted":"SPECIES"}},{"scientificName":"Pseudorca 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dolphin","rank":{"verbatim":"species","interpreted":"SPECIES"}},{"scientificName":"Ziphiidae","commonName":"Beaked whales","rank":{"verbatim":"family","interpreted":"FAMILY"}},{"scientificName":"Ziphius cavirostris","commonName":"Cuvier's beaked whale","rank":{"verbatim":"species","interpreted":"SPECIES"}}]}],"geographicCoverages":[{"description":"North Atlantic Ocean,United States of America","boundingBox":{"minLatitude":24.28098,"maxLatitude":38.89468,"minLongitude":-86.70882,"maxLongitude":38.89468,"globalCoverage":false}}],"temporalCoverages":[{"@type":"range","start":"2021-06-13T00:00:00.000+00:00","end":"2021-09-04T00:00:00.000+00:00"}],"keywordCollections":[{"thesaurus":"GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xml","keywords":["Occurrence"]},{"thesaurus":"GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml","keywords":["Observation"]},{"thesaurus":"N/A","keywords":["Marine Biology","Vessel","Distance 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Page","charset":"UTF-8","url":"https://seamap.env.duke.edu/dataset/2373","format":"Interactive map"},{"name":"FGDC Metadata","charset":"UTF-8","url":"https://seamap.env.duke.edu/dataset/2373/fgdc","format":"XML"},{"name":"EML Metadata","charset":"UTF-8","url":"https://seamap.env.duke.edu/dataset/2373/eml","format":"XML"}],"dataLanguage":"eng","purpose":"The primary goal was to conduct visual line-transect survey for abundance estimation, and distribution of cetaceans in the U.S. waters of the Atlantic Ocean.
","additionalInfo":"marine, harvested by iOBIS. This is a reformatted version of the archive stored in U.S. National Centers for \nEnvironmental Information (NCEI; https://doi.org/10.25921/gwbg-7k67).\n\nSightings reported as Mobula birostris (AphiaID: 1026118) were mapped to Manta birostris (TSN: 160992) for consistency with the ITIS taxonomy adopted by OBIS‑SEAMAP.\n\nSightings reported as Selachii (AphiaID: 368408) were mapped to Elasmobranchii (TSN: 159786) for consistency with the ITIS taxonomy adopted by OBIS‑SEAMAP.\nNon-animal observations are removed.","pubDate":"2026-01-07T00:00:00.000+00:00","maintenanceUpdateFrequency":"NOT_PLANNED","maintenanceDescription":"","license":"http://creativecommons.org/publicdomain/zero/1.0/legalcode","dwca":{"coreType":"http://rs.tdwg.org/dwc/terms/Occurrence","extensions":[],"modified":"2026-10-12T02:32:42.073+00:00"},"approximateCounts":{"occurrenceCount":650}}