SWFSC Marine Mammal Survey, PODS 1993, Cruise 1508

Jeffrey Moore

doi:10.15468/wfs5es

SWFSC Marine Mammal Survey, PODS 1993, Cruise 1508

Citation

Gerrodette, T. 2004. SWFSC Marine Mammal Survey, PODS 1993, Cruise 1508. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/213) on yyyy-mm-dd. https://doi.org/10.15468/wfs5es accessed via GBIF.org on 2025-07-15.

Description

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, Delphinus delphis, 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, Delphinus capensis. This survey was conducted by the NOAA Southwest Fisheries Science Center aboard NOAA Ships McArthur and David Starr Jordan 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 McArthur. Purpose: 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. Supplemental information: [2021-04-12] Updated with additional attributes. 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)

Purpose

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.

Sampling Description

Study Extent

NA

Sampling

NA

Method steps

NA

Additional info

marine, harvested by iOBIS

Taxonomic Coverages

Scientific names are based on the Integrated Taxonomic Information System (ITIS).

Stenella longirostris orientalis
rank: subspecies
Stenella coeruleoalba
common name: Striped Dolphin rank: species
Steno bredanensis
common name: Rough-toothed Dolphin rank: species
Delphinus capensis
common name: Long-beaked Common Dolphin rank: species
Delphinus delphis
common name: Short-beaked Common Dolphin rank: species
Tursiops truncatus
common name: Common Bottlenose Dolphin rank: species
Stenella attenuata
common name: Pantropical Spotted Dolphin rank: species
Grampus griseus
common name: Risso's Dolphin rank: species
Lagenorhynchus obliquidens
common name: Pacific White-sided Dolphin rank: species
Lissodelphis borealis
common name: Northern Right Whale Dolphin rank: species
Globicephala macrorhynchus
common name: Short-finned Pilot Whale rank: species
Orcinus orca
common name: Killer Whale rank: species
Phocoena phocoena
common name: Harbor Porpoise rank: species
Phocoenoides dalli
common name: Dall's Porpoise rank: species
Physeter macrocephalus
common name: Sperm Whale rank: species
Kogia breviceps
common name: Pygmy Sperm Whale rank: species
Hyperoodontidae
rank: family
Delphinus
common name: common dolphins rank: genus
Mesoplodon
common name: beaked whales rank: genus
Mesoplodon densirostris
common name: Blainville's Beaked Whale rank: species
Ziphius cavirostris
common name: Cuvier's Beaked Whale rank: species
Berardius bairdii
common name: Baird's Beaked Whale rank: species
Balaenoptera
common name: baleen whales rank: genus
Balaenoptera acutorostrata
common name: Minke Whale rank: species
Balaenoptera edeni
common name: Eden's whale rank: species
Balaenoptera borealis
common name: Sei Whale rank: species
Balaenoptera physalus
common name: Fin Whale rank: species
Balaenoptera musculus
common name: Blue Whale rank: species
Megaptera novaeangliae
common name: Humpback Whale rank: species
Cetacea
common name: cetaceans rank: order
Cetacea
common name: cetaceans rank: order
Cetacea
common name: cetaceans rank: order
Kogia
common name: pygmy sperm whales rank: genus
Stenella attenuata
common name: Pantropical Spotted Dolphin rank: species
Cetacea
common name: cetaceans rank: order
Cetacea
common name: cetaceans rank: order
Balaenoptera
common name: baleen whales rank: genus
Caretta caretta
common name: Loggerhead Sea Turtle rank: species
Callorhinus ursinus
common name: Northern Fur Seal rank: species
Lepidochelys olivacea
common name: Olive Ridley rank: species
Mirounga angustirostris
common name: Northern Elephant Seal rank: species
Caniformia
common name: pinnipeds rank: suborder
Phocidae
common name: earless seals rank: family
Cheloniidae
common name: Sea Turtles rank: family
Zalophus californianus
common name: California Sea Lion rank: species

Geographic Coverages

Pacific,California Current,California,Mexico,Gulf of California

Bibliographic Citations

Contacts

Jeffrey Moore
originator
position: Primary contact
Southwest Fisheries Science Center, NOAA
email: jeff.e.moore@noaa.gov
homepage: https://www.fisheries.noaa.gov/west-coast/science-data/california-current-marine-mammal-assessment-program

OBIS-SEAMAP
metadata author
Marine Geospatial Ecology Lab, Duke University
A328 LSRC building
Durham
27708
NC
US
email: seamap-contact@duke.edu
homepage: https://seamap.env.duke.edu

OBIS-SEAMAP
distributor
Marine Geospatial Ecology Lab, Duke University
A328 LSRC building
Durham
27708
NC
US
email: seamap-contact@duke.edu
homepage: https://seamap.env.duke.edu

Jeffrey Moore
owner
position: Primary contact
Southwest Fisheries Science Center, NOAA
email: jeff.e.moore@noaa.gov
homepage: https://www.fisheries.noaa.gov/west-coast/science-data/california-current-marine-mammal-assessment-program

Jeffrey Moore
administrative point of contact
position: Primary contact
Southwest Fisheries Science Center, NOAA
email: jeff.e.moore@noaa.gov
homepage: https://www.fisheries.noaa.gov/west-coast/science-data/california-current-marine-mammal-assessment-program