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SWFSC Marine Mammal Survey, PODS 1993, Cruise 1508
Citation
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

Access data
Archived data
Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Description
Data of a line-transect survey designed to make abundance estimates of the northern stock of common dolphin, Delphinus delphis, in the eastern Pacific in 1993. more

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. 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.

Scope
Themes:
Biology > Mammals, Biology > Reptiles
Keywords:
Marine, I, Pacific, Cetacea, Pinnipedia, Testudines

Geographical coverage
I, Pacific [Marine Regions]

Temporal coverage
28 July 1993 - 2 November 1993

Taxonomic coverage
Cetacea [WoRMS]
Pinnipedia [WoRMS]
Testudines [WoRMS]

Contributors
National Oceanic and Atmospheric Administration; Fisheries Service; Southwest Fisheries Science Center (SWFSC), moredata owner

Related datasets
Published in:
OBIS-SEAMAP: Spatial Ecological Analysis of Megavertebrate Populations, more

Publication
Based on this dataset:
Mangels, K.F.; Gerrodette, T. (1994). Report on cetacean sightings during a marine mammal survey in the Eastern Tropical Pacific Ocean and the Gulf of California aboard the NOAA ships McArthur and David Starr Jordan, July 28-November 6, 1993. NOAA Technical Memorandum, 211. National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southwest Fisheries Center: California. iv, 10 + tables + figures + appendices pp., more

Dataset status: Completed
Data type: Data
Data origin: Research
Metadatarecord created: 2012-11-14
Information last updated: 2015-04-13
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