https://doi.org/10.82144/81b20fde https://www.gbif.org/dataset/889345d0-8008-45cc-a169-37ee0289baa5 https://seamap.env.duke.edu/dataset/146 https://obis.org/dataset/6e6292da-0aae-4e37-be54-4461c661e2c5 Kimberly Goetz Duke University Primary contact ktg4@duke.edu Janice Waite National Marine Mammal Laboratory Primary contact Janice.Waite@noaa.gov OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

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seamap-contact@duke.edu https://seamap.env.duke.edu distributor Kimberly Goetz Duke University Primary contact ktg4@duke.edu owner Janice Waite National Marine Mammal Laboratory Primary contact Janice.Waite@noaa.gov owner 2025-09-11 eng Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: In spring 1991, Southeast Alaska, Cook Inlet, and Bristol Bay, was surveyed for harbor porpoise (<i>Phocoena phocoena</i>) from the NOAA John N. Cobb using line transect methodology. The shipboard platform was 28.36 m (93 ft) in length with a bridge height of 4.27 m (14 ft). To obtain data on seasonal movements of porpoise, a limited number of transects were made in areas of known porpoise concentrations. When a sighting was made, the following variables were recorded: time, angle, number of reticles to the sighting, radar distance (nm) to the shoreline at the same angle of the sighting, the species, the count of the porpoise seen (best, high, and low), and the animal(s) direction of travel. Search effort was recoded by noting the time and location of the ship at the beginning and end of each transect. 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 Vessels Sightings harbor porpoise Phocoena phocoena abundance marine mammal survey survey marine mammal cetacean N/A This dataset and associated effort data were updated on September 8, 2005. Those who downloaded them before that date should renew them. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License. https://seamap.env.duke.edu/dataset/146 Oceans,Southeast Alaska,Bristol Bay,Cook Inlet -136.76337 -130.91943 59.0227 55.21296 1991-04-20 1991-05-03 Scientific names are based on the Integrated Taxonomic Information System (ITIS). species Balaenoptera acutorostrata Common minke whale order Cetacea Cetaceans species Lagenorhynchus obliquidens Pacific white-sided dolphin species Megaptera novaeangliae Humpback whale species Orcinus orca Killer whale species Phocoena phocoena Harbor porpoise species Phocoenoides dalli Dall's porpoise Although harbor porpoises, <i>Phocoena phocoena</i>, are known to occur throughout Alaska waters, few estimates of abundance exist. In 1991, the National Marine Mammal Laboratory initiated a 3 year study on Alaska harbor porpoises. The objectives of this program were to: <br> 1) Obtain minimum population estimates in coastal waters using line transect methodology with a coefficient of variation for density estimates of less than 30% for each survey area, and <br> 2) Establish a baseline for detecting changes in abundance through time, for analysis of trends. <br><br> The ability of the observers to sight porpoise was sensitive to environmental conditions. As expected, when conditions deteriorated the number of porpoises observed declined. notPlanned Kimberly Goetz Duke University Primary contact ktg4@duke.edu Janice Waite National Marine Mammal Laboratory Primary contact Janice.Waite@noaa.gov NA NA NA Kimberly Goetz owner Janice Waite owner NA zd_146 2025-09-11T12:25:28-04:00 dataset Goetz, K. and J. Waite. 2004. NMML Harbor Porpoise Vessel Survey, SE Alaska, Spring 1991. Version 1.7.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/81b20fde. Dahlheim, M. E., P. A. White, J. M. Waite. 2009. Cetaceans of Southeast Alaska: distribution and seasonal occurrence. Journal of Biogeography36: 410-426. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/146 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/146/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/146/eml OBIS-SEAMAP zd_146 zd_146