In spring 1991, Southeast Alaska, Cook Inlet, and Bristol Bay, was surveyed for harbor porpoise (<i>Phocoena phocoena</i>) from the NOAA John N. Cobb using line transect methodology. The shipboard platform was 28.36 m (93 ft) in length with a bridge height of 4.27 m (14 ft). To obtain data on seasonal movements of porpoise, a limited number of transects were made in areas of known porpoise concentrations. When a sighting was made, the following variables were recorded: time, angle, number of reticles to the sighting, radar distance (nm) to the shoreline at the same angle of the sighting, the species, the count of the porpoise seen (best, high, and low), and the animal(s) direction of travel. Search effort was recoded by noting the time and location of the ship at the beginning and end of each transect.
Although harbor porpoises, <i>Phocoena phocoena</i>, are known to occur throughout Alaska waters, few estimates of abundance exist. In 1991, the National Marine Mammal Laboratory initiated a 3 year study on Alaska harbor porpoises. The objectives of this program were to: <br>
1) Obtain minimum population estimates in coastal waters using line transect methodology with a coefficient of variation for density estimates of less than 30% for each survey area, and <br>
2) Establish a baseline for detecting changes in abundance through time, for analysis of trends. <br><br>
The ability of the observers to sight porpoise was sensitive to environmental conditions. As expected, when conditions deteriorated the number of porpoises observed declined.
This dataset and associated effort data were updated on September 8, 2005. Those who downloaded them before that date should renew them.
Dahlheim, M. E., P. A. White, J. M. Waite2009Cetaceans of Southeast Alaska: distribution and seasonal occurrencehttp://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1173&context=usdeptcommercepubJournal of Biogeography36: 410-426
ground condition
1991-04-20
1991-05-03
None planned
-136.76337-130.9194359.022755.21296-136.76337-130.9194359.022755.21296
PlatformVesselsSightingsUser definedharbor porpoisePhocoena phocoenaabundancemarine mammal surveysurveymarine mammalcetaceanUser definedSoutheast AlaskaBristol BayCook Inlet
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
<a href='http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1173&context=usdeptcommercepub' target='reference'>Dahlheim, M. E., P. A. White, J. M. Waite. 2009. Cetaceans of Southeast Alaska: distribution and seasonal occurrence. Journal of Biogeography. 36: 410-426</a>
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
Janice Waite
National Marine Mammal Laboratory
mailing and physical address
7600 Sand Point Way N.E.
Seattle
WA
98115-6349
USA
206-526-6554
Janice.Waite@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 datasetKingdomAnimalia202423PhylumChordata158852SubphylumVertebrata331030ClassMammalia179913SubclassTheria179916InfraclassEutheria179925OrderCetacea180403SuborderMysticeti552298FamilyBalaenopteridae180522GenusBalaenoptera180523SpeciesBalaenoptera acutorostrata180524GenusMegaptera180529SpeciesMegaptera novaeangliae180530SuborderOdontoceti180404FamilyDelphinidae180415GenusLagenorhynchus180441SpeciesLagenorhynchus obliquidens180444GenusOrcinus180468SpeciesOrcinus orca180469FamilyPhocoenidae552307GenusPhocoena180472SpeciesPhocoena phocoena180473GenusPhocoenoides180479SpeciesPhocoenoides dalli180480
Dahlheim, M. E., P. A. White, J. M. Waite2009Cetaceans of Southeast Alaska: distribution and seasonal occurrencehttp://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1173&context=usdeptcommercepubJournal of Biogeography36: 410-426Halpin, 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 distributionsOceanography22(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 addressLSRC A328DurhamNCUSA27708efujioka@duke.edu919-613-8021
http://www.nbii.gov/
Biological Data Profile
2004-08-092012-08-15
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/146GCS_WGS_1984Decimal degrees0.0001670.000167D_WGS_1984WGS_19846378137.000000298.257224National Marine Mammal LaboratorydatasetlinenodupldateeventtimedtimebeaufortweatherportvisstarvisshipheadlatdeglatmindlatlondeglonmindlongpdisshorpdismetsdisshorsdismetpobsrecordersobsspeciescommontsnSpecies ITIS TSNscientificgroupbowanglereticlesnumretdistshordisshormestdisanedismetraddisperpdisdirtravobservbesthighlowspeedcommentsexcludedoidUnique ID number (generated by SEAMAP)