https://doi.org/10.82144/3c5c9a9f https://seamap.env.duke.edu/dataset/2240 https://www.gbif.org/dataset/4a9f6d0a-e993-4603-9cc3-a60a15860370 https://obis.org/dataset/de39d839-f402-4784-8af3-558702eac4ca Marie C. Hill NOAA Pacific Islands Fisheries Science Center Primary contact Marie.Hill@noaa.gov OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu distributor Marie C. Hill NOAA Pacific Islands Fisheries Science Center Primary contact Marie.Hill@noaa.gov owner 2025-07-31 eng Original provider: NOAA Pacific Islands Fisheries Science Center (PIFSC) Dataset credits: NOAA Pacific Islands Fisheries Science Center Abstract: In summer 2021, the Pacific Islands Fisheries Science Center conducted a comprehensive line-transect survey for cetaceans and seabirds within the United States exclusive economic zones of Guam and the Commonwealth of the Northern Mariana Islands. MACS 2021 sailed for 59 days at sea aboard the NOAA Ship Oscar Elton Sette in May–July, 2021, and surveyed 8,711.7 km of trackline. There were 77 cetacean sightings of at least 12 species. Occurrence GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xml Observation GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml Marine Biology Visual sighting Marine Animal Survey Marine mammals Visual Sighting Vessel N/A Data were collected under NMFS permit 20311. The data included here are the sightings and on-effort tracks recorded within WinCruz survey software and extracted from the QA/QC'd DAS file using the R package swfscDAS (https://smwoodman.github.io/swfscDAS). Attributes for fields within the trackline files: Cruise - see description in attribute table below segnum - segment number for continuous on-effort line Date - Local date m/dd/yyyy TimeStart - Local time at start of on-effort segment LatStart - Latitude in decimal degrees at starting point of on-effort segment LongStart - Longitude in decimal degrees at starting point of on-effort segment TimeEnd - Local time at end of on-effort segment LatEnd - Latitude in decimal degrees at end point of on-effort segment LongEnd - Longitude in decimal degrees at end point of on-effort segment Mode - see description in attribute table below EffType - see description in attribute table below avgSpdKt - average speed (knots) of the ship over the on-effort segment traveled avgBft - average Beaufort Sea State over the on-effort segment Other data not included here: Photos and biopsy samples were collected during some sightings. Acoustic detections were recorded from a towed hydrophone array. Sonobuoys were deployed opportunistically. Drifting Acoustic Spar Buoy Recorders (DASBRs) were deployed and recovered opportunistically. High-frequency Acoustic Recording Packages (HARPs) were recovered and redeployed off Saipan and Pagan. To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction. https://seamap.env.duke.edu/dataset/2240 Oceans,Guam,Commonwealth of the Northern Mariana Islands 141.6 149.00267 23.02917 11.09117 2021-05-09 2021-07-13 Scientific names are based on the Integrated Taxonomic Information System (ITIS). genus Balaenoptera Baleen whales family Balaenopteridae Rorquals order Cetacea Cetaceans family Delphinidae Dolphins species Feresa attenuata Pygmy killer whale species Globicephala macrorhynchus Short-finned pilot whale species Indopacetus pacificus Longman's beaked whale species Kogia sima Dwarf sperm whale genus Mesoplodon Beaked whales species Physeter macrocephalus Sperm whale species Pseudorca crassidens False killer whale species Stenella attenuata Pantropical spotted dolphin species Stenella coeruleoalba Striped dolphin species Stenella longirostris Spinner dolphin species Steno bredanensis Rough-toothed dolphin species Tursiops truncatus Common bottlenose dolphin species Ziphius cavirostris Cuvier's beaked whale The Mariana Archipelago Cetacean Survey (MACS) 2021 project was part of the multi-year Pacific Marine Assessment Program for Protected Species (PacMAPPS) plan to conduct surveys and estimate density for cetacean species in regions of joint NOAA Fisheries, Bureau of Ocean Energy Management, and U.S. Navy interest. notPlanned Marie C. Hill NOAA Pacific Islands Fisheries Science Center Primary contact Marie.Hill@noaa.gov NA NA NA Marie C. Hill owner NA zd_2240 2025-07-31T17:40:25-04:00 dataset Hill, M. 2023. PIFSC, Cetacean Survey, MACS 2021, Cruise 2102, NOAA Pacific Islands Fisheries Science Center. Version 1.1.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/3c5c9a9f. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/2240 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/2240/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/2240/eml OBIS-SEAMAP zd_2240 zd_2240 Yano KM, Hill MC, Oleson EM, McCullough JLK, and Henry AE. 2022. Cetacean and seabird data collected during the Mariana Archipelago Cetacean Survey (MACS), May–July 2021. U.S. Department of Commerce, NOAA Technical Memorandum NOAA-TM-NMFS-PIFSC-128: 59 p.