https://doi.org/10.82144/6c53f5bc https://seamap.env.duke.edu/dataset/213 https://www.gbif.org/dataset/e7742aab-883c-49ad-bb12-ddb6dff6129e https://obis.org/dataset/39aa2775-5188-4b85-9b5a-896d7263ad03 Jeffrey Moore Southwest Fisheries Science Center, NOAA Primary contact jeff.e.moore@noaa.gov https://www.fisheries.noaa.gov/west-coast/science-data/california-current-marine-mammal-assessment-program Dave Weller NOAA Southwest Fisheries Science Center Secondary contact dave.weller@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 Jeffrey Moore Southwest Fisheries Science Center, NOAA Primary contact jeff.e.moore@noaa.gov https://www.fisheries.noaa.gov/west-coast/science-data/california-current-marine-mammal-assessment-program owner Dave Weller NOAA Southwest Fisheries Science Center Secondary contact dave.weller@noaa.gov originator 2025-07-31 eng Original provider: NOAA Southwest Fisheries Science Center (SWFSC) Dataset credits: NOAA Southwest Fisheries Science Center (SWFSC) Abstract: This 1993 line-transect survey was designed to make abundance estimates of the northern stock of common dolphin, <i>Delphinus delphis</i>, in the eastern Pacific. This stock of dolphin is taken in the tropical tuna fishery. The index of relative abundance for this stock, computed from sightings on tuna vessels, has declined substantially in the last decade. However, because tuna vessels cover only the southern portion of the stock's range, the declines in the index may be due to a northward shift in distribution, rather than an actual decline in abundance. The 1993 survey was designed to produce the first range-wide estimates of abundance for the northern common dolphin and its recently described congener, <i>Delphinus capensis</i>. This survey was conducted by the NOAA Southwest Fisheries Science Center aboard NOAA Ships <i>McArthur</i> and <i>David Starr Jordan</i> for a combined total of approximately 32,000 kilometers surveyed from late July to early November 1993. This dataset provides the time-date and geographical coordinates, by species/stock, of all cetaceans detected during the survey, as well as the daily and intra-daily start and end points of the line-transect survey by the NOAA Ship <i>McArthur</i>. 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 Cetaceans Whales Dolphins Delphinus Population Abundance Survey Census PODS N/A SWFSC MMTD Cruise Number: 1508 Perpendicular distance will be released upon permission by the contributor. Please contact the contributor if needed. Attribute descriptions for effort data: dist: Length of the segment (km) Mode: Effort mode type (C = closing mode; P = passing mode). 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/213 Oceans,Pacific,California Current,California,Mexico,Gulf of California -130.643167 -106.9685 41.937833 21.034333 1993-07-28 1993-11-02 Scientific names are based on the Integrated Taxonomic Information System (ITIS). genus Balaenoptera Baleen whales species Balaenoptera acutorostrata Common minke whale species Balaenoptera borealis Sei whale species Balaenoptera edeni Eden's whale species Balaenoptera musculus Blue whale species Balaenoptera physalus Fin whale species Berardius bairdii Baird's beaked whale species Callorhinus ursinus Northern fur seal suborder Caniformia Pinnipeds species Caretta caretta Loggerhead sea turtle order Cetacea Cetaceans family Cheloniidae Sea turtles genus Delphinus Common dolphins species Delphinus capensis Long-beaked common dolphin species Delphinus delphis Short-beaked common dolphin species Globicephala macrorhynchus Short-finned pilot whale species Grampus griseus Risso's dolphin family Hyperoodontidae Beaked whales genus Kogia Pygmy sperm whales species Kogia breviceps Pygmy sperm whale species Lagenorhynchus obliquidens Pacific white-sided dolphin species Lepidochelys olivacea Olive ridley species Lissodelphis borealis Northern right whale dolphin species Megaptera novaeangliae Humpback whale genus Mesoplodon Beaked whales species Mesoplodon densirostris Blainville's beaked whale species Mirounga angustirostris Northern elephant seal species Orcinus orca Killer whale family Phocidae Earless seals species Phocoena phocoena Harbor porpoise species Phocoenoides dalli Dall's porpoise species Physeter macrocephalus Sperm whale species Stenella attenuata Pantropical spotted dolphin species Stenella coeruleoalba Striped dolphin subspecies Stenella longirostris orientalis species Steno bredanensis Rough-toothed dolphin species Tursiops truncatus Common bottlenose dolphin species Zalophus californianus California sea lion species Ziphius cavirostris Cuvier's beaked whale The primary objective of the cruise was to survey the area inhabited by the northern stock of common dolphins, and to make an estimate of its absolute abundance in order to assess the impact of the dolphins killed by the United States and international yellowfin tuna purse seine fleet in the eastern tropical Pacific. notPlanned Jeffrey Moore Southwest Fisheries Science Center, NOAA Primary contact jeff.e.moore@noaa.gov https://www.fisheries.noaa.gov/west-coast/science-data/california-current-marine-mammal-assessment-program NA NA NA Jeffrey Moore owner Dave Weller originator NA zd_213 2025-07-31T14:12:10-04:00 dataset Moore, J. and D. Weller. 2021. SWFSC Marine Mammal Survey, PODS 1993, Cruise 1508. Version 2.0.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/6c53f5bc. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/213 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/213/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/213/eml OBIS-SEAMAP zd_213 zd_213 Mangels, K.F., and T. Gerrodette. 1994. Report on cetacean sightings during a marine mammal survey in the Eastern Tropical Pacific Ocean aboard the NOAA Ships McArthur and David Starr Jordan, July 28-November 6, 1993. NOAA-TM-NMFS-SWFSC-211.