SWFSC Marine Mammal Survey, Delphinus 2009, Cruise 1640

NOAA Southwest Fisheries Science Center (SWFSC)

Dataset credit

NOAA Southwest Fisheries Science Center (SWFSC)


Primary contact Jeffrey Moore Southwest Fisheries Science Center, NOAA
Data entry Ei Fujioka Duke University



The 2009 "Ecosystem Survey of Delphinus Species" research survey focused
on the two species of common dolphin, Delphinus delphis and D.
, found off southern California, USA, and Baja California, Mexico.
The primary objective was to provide information to improve conservation
and management plans for these species. The project used a multidisciplinary
approach. For both Delphinus species, data were collected to estimate
abundance, pregnancy and birth rates, timing of reproduction, gene flow, and
contaminant concentrations. Oceanographic data were collected to
characterize habitat, and data on distribution and abundance of seabirds,
prey fishes, and squids were collected to further characterize the ecosystem in
which these dolphins live. Photographs of dolphin schools were taken from a
NOAA Twin Otter aircraft while the survey was being conducted. The aerial
photographs will provide count and measurement data to calibrate observer
estimates of school size and to estimate timing of reproduction and birth
rates. This research will facilitate understanding population demography of
these species in an ecosystem framework. Essential information about the
primary focal species, D. capensis, will greatly increase our knowledge
about this coastal species and the geographic extent of a Mexico-U.S.
transboundary stock. For additional information about the Delphinus cruise,
please see http://swfsc.noaa.gov/prd-delphinus.aspx.


The primary objectives of the 2009 Delphinus ecosystem cruise were (1) to
characterize the distribution, habitat and reproductive characteristics of long-
and short-beaked common dolphins, and (2) to improve non-lethal sampling
techniques for studying reproduction in wild, free-ranging cetaceans.

Supplemental information

[2021-04-13] Updated with additional attributes.

SWFSC MMTD Cruise Number: 1640
Perpendicular distance is not publicly available. Please contact the data
provider if needed.

Attribute descriptions for effort data:
dist: Length of the segment (km)
Mode: Effort mode type (C = closing mode; P = passing mode)




This section explains attributes included in the original dataset. OBIS-SEAMAP restricts the attributes available to the public to date/time, lat/lon and species names/counts only. Should you need other attributes described here, you are encouraged to contact the data provider.

Attributes described below represent those in the original dataset provided by the provider.
Only minimum required attributes are visible and downloadable online. Other attributes may be obtained upon provider's permission.

Attributes in dataset

Attribute (table column)Description
oidUnique ID number (generated by OBIS-SEAMAP)
eventS = marine mammal sighting; t = sea turtle sighting; p = pinniped sighting
datetimeDate and time of sighting (local time)
latLatitude (decimal degrees) of vessel when sighting was made
lonLongitude (decimal degrees) of vessel when sighting was made
cruiseSWFSC Marine Mammal and Turtle Divison Cruise number
sightnoSighting number (within Cruise)
nspNumber of species observed in the sighting
mixedTRUE for a multi-species sighting (nSp >= 2); FALSE otherwise (nSp = 1)
spcodeSpecies code
sp_tsnTaxonomic Serial Number added by OBIS-SEAMAP
gsspbestThe mean of all observers
gssphighThe mean of all observers
gssplowThe mean of all observers
perpdistkmPerpendicular distance (km) to sighting from trackline
bftBeaufort sea state, as assessed by looking upswell with the naked eye.
swellhghtAverage swell height from trough to crest of typical swells (estimated in feet, by eye)
visA measure of air/atmospheric clarity
groupsize_sightnoRunning count ID of all cetacean groups recorded (should be same as SightNo)
groupsize_countNumber of observers that provided a group size estimate (for calculating GsSpBest) for S events.
groupsize_count_obsNumber of unique observer codes per sighting for S events
geomGeometry field added by OBIS-SEAMAP
Marine mammals1,155
Sea turtles53
Rays and sharks0
Other species0
Non spatial0
Non species0
Date, Begin2009-09-07
Date, End2009-12-05
Temporal prec.111111
Latitude21.86 - 37.59
Longitude-122.73 - -109.73
Coord. prec.6 decimal digits
Data typeAnimal sighting
EffortYES (ID: 1070)
Traveled (km)7,035
Effort hours385
Contr. through
Sharing policy CC-BY-NC (Minimum)
Also available in OBIS
GBIF (via DOI)
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