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 1,829 m [1,000 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 white-sided 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).
The current study (1997-1999) will provide new abundance estimates for each stock of harbor porpoise and Dall's porpoise. <br><br>
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).<br><br>
References: <br>
Dahlheim, M., A. York, J. Waite, and C. Goebel-Diaz. 1992. Abundance and distribution of harbor porpoise (<i>Phocoena phocoena</i>) in southeast Alaska, Cook Inlet and Bristol Bay. Annual report to the MMPA Assessment Program, Office of Protected Resources, NMFS, NOAA, 1335 East-West Highway, Silver Spring, MD 20910.<br>
Dahlheim, M., A. York, J. Waite, and R. Towell. 1993. Abundance and distribution of harbor porpoise (<i>Phocoena
phocoena</i>) in southeast Alaska, Kodiak Island, and the south side of the Alaska Peninsula, 1992. Annual report to the MMPA Assessment Program, Office of Protected Resources, NMFS, NOAA, 1335 East-West Highway, Silver Spring, MD 20910.<br>
Dahlheim, M., A. York, J. Waite, and R. Towell. 1994. Abundance and distribution of harbor porpoise (<i>Phocoena
phocoena</i>) in southeast Alaska and the offshore waters of Dixon Entrance to Prince William Sound, 1993. Annual report to the MMPA Assessment Program, Office of Protected Resources, NMFS, NOAA, 1335 East-West Highway, Silver Spring, MD 20910.
Hobbs, R2013NMML Small Cetacean Aerial Survey 1999http://seamap.env.duke.edu/dataset/117OBIS-SEAMAP117http://seamap.env.duke.edu/dataset/117OBIS-SEAMAP
ground condition
1999-06-11
1999-07-04
None planned
-164.7692-157.070559.07153.9342-164.7692-157.070559.07153.9342
PlatformAircraftSightingsUser definedaerial surveysurveyarialcetaceanporpoiseUser definedAlaskaGulf of AlaskaSoutheast AlaskaBristol BayBering Sea
Open public unless otherwise noted. See Use Constraints for details.
1. Not to use data obtained from OBIS-SEAMAP in any publication, product, or commercial application without proper attribution to the original data provider(s) and OBIS-SEAMAP unless the datasets are explicitly shown under the CC0 policy. Citations or credits are suggested as attribution. If the data you downloaded come from multiple datasets, a citation or credit to each of the datasets is required.
Suggested citation for this dataset:
Hobbs, R. 2013. NMML Small Cetacean Aerial Survey 1999. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/117) on yyyy-mm-dd.
Suggested citation for OBIS-SEAMAP:
Halpin, P.N., A.J. Read, E. Fujioka, B.D. Best, B. Donnelly, L.J. Hazen, C. Kot, K. Urian, E. LaBrecque, A. Dimatteo, J. Cleary, C. Good, L.B. Crowder, and K.D. Hyrenbach. 2009. OBIS-SEAMAP: The world data center for marine mammal, sea bird, and sea turtle distributions. Oceanography 22(2):104-115
2. To forward the citation of any publication / report that made use of the data / tools provided by OBIS-SEAMAP for inclusion in our list of references.
3. Not to hold OBIS-SEAMAP or the original data providers 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.
4. The burden for determining fitness for use of the downloaded data for any analyses lies entirely with the user. OBIS-SEAMAP or the original data providers do not support outcomes of your analyses that used the data you downloaded from OBIS-SEAMAP.
5. To consider inclusion of the accompanying transect (effort) dataset if available into the methodology of your analyses.
6. Not to redistribute the data you downloaded from OBIS-SEAMAP through any media without contect from OBIS-SEAMAP and the original data providers unless the datasets are explicitly shown under the CC0 policy.
Shapefile
Roderick Hobbs
National Marine Mammal Laboratory
mailing and physical address
7600 Sand Point Way NE
Seattle
WA
98115-6349
USA
206-526-6278
Rod.Hobbs@noaa.gov
National Marine Mammal Laboratory
Integrated Taxonomic Information SystemIntegrated Taxonomic Information Systemhttp://www.itis.usda.gov/Downloaded April, 2004Refer to the contact information of the dataset
Halpin, P.N., A.J. Read, E. Fujioka, B.D. Best, B. Donnelly, L.J. Hazen, C. Kot, K. Urian, E. LaBrecque, A. Dimatteo, J. Cleary, C. Good, L.B. Crowder, and K.D. Hyrenbach2009OBIS-SEAMAP: The world data center for marine mammal, sea bird, and sea turtle distributionsvector digital dataOceanography22(2):104-115http://www.tos.org/oceanography/article/obis-seamap-the-world-data-center-for-marine-mammal-sea-bird-and-sea-turtle
Ei FujiokaDuke Universitymailing and physical addressA328 LSRCDurhamNC27708USAefujioka@duke.edu919-613-8021
http://www.nbii.gov/
Biological Data Profile
2007-04-202012-03-28
OBIS-SEAMAPNicholas School of Environment, Duke Univ.mailing and physical addressA328, LSRCDurhamNC27708USA919-613-8021seamap-contact@duke.eduNot 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.FreeGo to the OBIS-SEAMAP web sitezipzipped shapefilehttp://seamap.env.duke.edu/dataset/117GCS_WGS_1984Decimal degrees0.0001670.000167D_WGS_1984WGS_19846378137.000000298.257224National Marine Mammal LaboratorydatetimelatitudelongitudecountspeciesSpecies observedoidUnique ID number (generated by SEAMAP)