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NMML Small Cetacean (coastal) Aerial Survey 1999, Gulf of Alaska
Entry ID: seamap117


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Summary
Abstract: The National Marine Mammal Laboratory (NMML) conducted an aerial
survey for small cetaceans from 5 June to 4 July 1999 in Bristol Bay and along
southwestern Alaska Peninsula (out to the 1829 m (1000 fm) depth contour). A
total of 8,522 km were surveyed in a Dehavilland Twin Otter at 152.5 m (500 ft)
altitude and 185 km/hr (100 kts). Two overlapping sawtooth lines were designed
along the coastline of Bristol Bay. Both sides of each sawtooth were
approximately 37 km with a 46 km base. Large bays were also included in the
survey. Primary observers searched through bubble windows on the left and right
sides of the aircraft and reported sightings to a computer operator. To
estimate a perception bias correction factor for this study, an independent
observer was added at a belly window position to determine the number of
animals in the immediate vicinity of the trackline that were missed by the
primary observers. There were 215 sightings of harbor porpoise (260
individuals), 12 Dall's porpoise (24 individuals), and 16 Pacific whitesided
dolphins (170 individuals) while surveying tracklines. Additional cetacean
sightings included 12 gray whales (13 individuals), 18 humpback whales (29
individuals), 8 minke whales (13 individuals), and 3 killer whales (11
individuals).


Purpose: The current study (1997-99) will provide new abundance estimates for
each stock of harbor porpoise, and Dall's porpoise.

SUPPLEMENTAL INFORMATION: Although the previous harbor porpoise surveys (1991-
1993) used a vessel platform for the inside waters of Southeast Alaska
(Dahlheim et al. 1992, 1993, 1994), the current survey was conducted entirely
from aircraft. However, a concurrent vessel survey in a selected portion of
southeastern Alaska and a calibration study with the survey vessel. We report
here the results from the third year of surveys (1999).

CURRENTNESS REFERENCE: ground condition

SPATIAL REFERENCE INFORMATION -
GEODETIC MODEL
Horizontal Datum Name: D_WGS_1984
Ellipsoid Name: WGS_1984
Semi-major Axis: 6378137.000000
Denominator of Flattening Ratio: 298.257224

Related URL
Link: GET DATA
Link: GET DATA
Description: Access data from the OBIS and OBIS-SEAMAP websites.


Link: GET SERVICE > ACCESS MAP VIEWER
Description: OBIS-SEAMAP Map Service


Link: VIEW EXTENDED METADATA


Link: VIEW PROJECT HOME PAGE
Description: Ocean Biogeographic Information System - Spatial Ecological Analysis of
Megavertebrate Populations (OBIS-SEAMAP)


Link: VIEW PROJECT HOME PAGE
Description: Ocean Biogeographic Information System (OBIS)


Link: VIEW RELATED INFORMATION
Description: Biological Data Profile


Link: VIEW RELATED INFORMATION
Description: ESRI Metadata Profile


Parent DIF
This data set description is a member of a collection. The collection is described in
OBIS-SEAMAP


Geographic Coverage
 N: 59.071 S: 53.9342  E: -157.0705  W: -164.7692

Data Set Citation
Dataset Originator/Creator: National Marine Mammal Laboratory
Dataset Title: NMML Small Cetacean (coastal) Aerial Survey 1999, Gulf of Alaska
Dataset Series Name: OBIS-SEAMAP
Dataset Release Date: 2004-06-10 15:26:46.835071-04
Dataset Release Place: http://seamap.env.duke.edu/
Dataset Publisher: OBIS-SEAMAP
Data Presentation Form: vector digital data
Online Resource: http://nmml.afsc.noaa.gov/


Temporal Coverage
Start Date: 1999-06-11
Stop Date: 1999-07-04


Location Keywords
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > BERING SEA
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA


Data Resolution
Latitude Resolution: 0.000167 Decimal degrees
Longitude Resolution: 0.000167 Decimal degrees


Science Keywords
BIOLOGICAL CLASSIFICATION >ANIMALS/VERTEBRATES    [Definition]
BIOLOGICAL CLASSIFICATION >ANIMALS/VERTEBRATES >FISH    [Definition]


ISO Topic Category
BIOTA
BOUNDARIES


Platform
DHC-6 >DeHavilland Twin Otter    [Information]


Project
OBIS-SEAMAP >OBIS - Spatial Ecological Analysis of Megavertebrate Populations    [Information]


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
Constraints.


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.


Keywords
aerial survey
arial
baleia
baleines
Ballena gris
Ballena jorobada
Ballena menor
bosse
ceo
cetacean
cetaceans
common porpoise
Dall's porpoise
dauphins
dolphins
golfinho
gray whale
harbor porpoise
harbor seal
humpback whale
killer whale
marine mammals
Marsopa de Dall
marsouin commun
marsouins
minke whale
morse
n costado blanco
northern minke whale
northern sea lion
orca
Pacific white-sided dolphin
paulard
petit rorqual
phoque commun
porpoise
porpoises
res marins
steller sea lion
steller sealion
Steller's sea lion
survey
True's porpoise
walrus
whales


Data Set Progress
COMPLETE


Data Center
OBIS Spatial Ecological Analysis of Megavertebrate Populations    [Information]
Data Center URL: http://seamap.env.duke.edu/

Data Center Personnel
Name: PATRICK N. HALPIN
Phone: 919-613-8062
Email: phalpin at duke.edu
Contact Address:
Duke University
Box 90328
City: Durham
Province or State: NC
Postal Code: 27708
Country: USA



Distribution
Distribution_Format: Shapefile


Personnel
EI FUJIOKA
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: 919-613-8021
Fax: 919-684-8741
Email: efujioka at duke.edu
Contact Address:
LSRC A321
Box 90328
City: Durham
Province or State: NC
Postal Code: 27708
Country: USA


RODERICK HOBBS
Role: TECHNICAL CONTACT
Phone: 206-526-6278
Email: Rod.Hobbs at noaa.gov
Contact Address:
NATIONAL MARINE MAMMAL LABORATORY
7600 Sand Point Way NE
City: Seattle
Province or State: WA
Postal Code: 98115-6349
Country: USA



Creation and Review Dates
DIF Creation Date: 2007-01-22
Last DIF Revision Date: 2014-03-12


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