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SWFSC Cetacean Sightings during a Marine Mammal Survey in the Eastern Tropical Pacific (1468)
Entry ID: seamap211

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Abstract: This 1992 line-transect survey was designed to make abundance
estimates of the central stock of common dolphin, Delphinus delphis, in the
eastern Pacific. This stock of dolphin is taken in the tropical tuna fishery
and has suffered a substantial decline. Previous surveys covering larger areas
have permitted estimates of abundance, but with low precision. This survey was
conducted by the NOAA Southwest Fisheries Science Center aboard NOAA Ships
David Starr Jordan and McArthur for a combined total of approximately 32,000
kilometers surveyed from late July to early November 1992. 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 purpose of the cruise was to survey the area inhabited by
the central 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 U. S. and
international yellowfin tuna purse seine fleet in the eastern tropical Pacific.


Horizontal Datum Name: D_WGS_1984
Ellipsoid Name: WGS_1984
Semi-major Axis: 6378137.000000
Denominator of Flattening Ratio: 298.257224
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Caption:  Cetacean Sightings
Geographic Coverage
Spatial coordinates   
  N: 30.49   S: 2.0   E: -77.94   W: -116.3

Data Set Citation
Dataset Originator/Creator: NOAA Southwest Fisheries Science Center (SWFSC)
Dataset Title: SWFSC Cetacean Sightings during a Marine Mammal Survey in the Eastern Tropical Pacific (1468)
Dataset Series Name: OBIS-SEAMAP
Dataset Release Date: 2004-09-16 16:00:51.987444-04
Dataset Release Place:
Dataset Publisher: OBIS-SEAMAP
Data Presentation Form: vector digital data
Online Resource:
Parent DIF
This description is a member of a collection. The collection is described in

Temporal Coverage
Start Date: 1992-07-29
Stop Date: 1992-11-01
Data Resolution
Latitude Resolution: 0.000167 Decimal degrees
Longitude Resolution: 0.000167 Decimal degrees
Horizontal Resolution Range: 1 meter - < 30 meters
SHIPS Ancillary Description
Access Constraints ACCESS CONSTRAINTS: Open public unless otherwise noted.

DISTRIBUTION LIABILITY: Not to hold OBIS-SEAMAP liable for errors in the data.
While we have made every effort to ensure the quality of the database, we
cannot guarantee the accuracy of these datasets. Also please refer to Use
Use Constraints Not to use data contained in OBIS-SEAMAP in any publication, product, or
commercial application without prior written consent of the original data
provider. To cite both the data provider and OBIS-SEAMAP appropriately after
approval of use is obtained. Also please refer to Distribution Liability.
Ancillary Keywords
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Data Set Progress
Data Center
OBIS Spatial Ecological Analysis of Megavertebrate Populations Supplemental Info
Data Center URL:

Data Center Personnel
Phone: 919-613-8062
Email: phalpin at
Contact Address:
Duke University
Box 90328
City: Durham
Province or State: NC
Postal Code: 27708
Country: USA
Distribution Format: Shapefile
Phone: 919-613-8021
Fax: 919-684-8741
Email: efujioka at
Contact Address:
Box 90328
City: Durham
Province or State: NC
Postal Code: 27708
Country: USA
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Mangels, Karl F., and Tim Gerrodette. 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 2, 1992. 1994.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2007-04-11
Last DIF Revision Date: 2016-12-07
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