{"datasetrec":{"DasID":3346,"Acronym":null,"StandardTitle":"NMML Harbor Porpoise Vessel, SE Alaska, Fall 1993","OrigTitle":null,"OrigTitleLangID":null,"OrigTitleLangCode":null,"OrigTitleLang":null,"OrigTitleLangNL":null,"VersionName":"1","ContactEmail":null,"VersionDate":null,"VersionDay":13,"VersionMonth":11,"VersionYear":2012,"SizeReference":null,"EngAbstract":"Data from an aerial survey from Alaskan panhandle and Prince William Sound conducted to study the Alaska harbor porpoise (Phocoena phocoena) in fall 1993.","EngDescr":"Abstract\r\n\r\nIn fall 1993, the Alaskan panhandle and Prince William Sound were surveyed for harbor porpoise (Phocoena phocoena) 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.\r\n\r\n\r\nPurpose\r\n\r\nAlthough harbor porpoises, Phocoena phocoena, 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:\r\n1) 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\r\n2) Establish a baseline for detecting changes in abundance through time, for analysis of trends.\r\n\r\nThe ability of the observers to sight porpoise was sensitive to environmental conditions. As expected, when conditions deteriorated the number of porpoises observed declined.","OrigAbstract":null,"OrigDescr":null,"Comments":null,"ReleaseDate":null,"ReleaseDate0":null,"OrigDescrLang":null,"EmbargoDate":null,"OrigDescrLangNL":null,"OrigLangCode":null,"OrigLangCodeExtended":null,"OrigLangID":null,"DescrCompFlag":0,"DescrTransFlag":0,"Citation":"Dahlheim, M., A. White, P. A., and J. M. Waite. 2009. Cetaceans of Southeast Alaska: distribution and seasonal occurrence. Journal of Biogeography. 36: 410-426","AccessConstraints":null,"UDate":"2012-11-14","CDate":"2012-11-13","CurrencyDate":null,"RevisionDate":null,"DateLastModified":{"date":"2026-05-14 01:44:00.153333","timezone_type":1,"timezone":"+02:00"},"CheckedFlag":0,"PublicFlag":1,"VlizCoreFlag":1,"MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"StatusID":1,"DasType":"Data","DasTypeID":1,"DasOrigin":"Research","Progress":"Completed","AccessConstraint":"Attribution-NonCommercial (CC BY-NC)","AccConstrEN":"Attribution-NonCommercial (CC BY-NC)","AccConstrDisplay":"\"Creative This dataset is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.","License":"https://creativecommons.org/licenses/by-nc/4.0","AccConstrDescription":"This license lets others remix, tweak, and build upon your work non-commercially, and although their new works must also acknowledge you and be non-commercial, they don’t have to license their derivative works on the same terms","Lineage":null,"AccConID":24},"dois":null,"spcols":null,"keywords":[{"ThesaurusTerm":"I, North Pacific","ThesTypID":34,"ThesType":"ASFA Geoterms","Code":null,"Description":null,"OrigThesTerm":"I, North Pacific","DutchTerm":null,"URI":null,"DasKeywordDescr":null}],"parents":null,"children":null,"othrel":null,"othrelrev":[{"DasID":1865,"Acronym":"OBIS-SEAMAP","StandardTitle":"Spatial Ecological Analysis of Megavertebrate Populations","Relation":"Published dataset","RelationY":"Published in","RelID":13,"doi":null,"vlizDoi":null}],"ownerships":[{"OrderNr":1,"Surname":null,"Firstname":null,"Initials":null,"PerPublicFlag":null,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":null,"OrigNameLangCode":null,"OrigNameLangID":null,"FullOrigName":null,"InsOwnerCNT":2,"PersID":null,"InsID":1120,"FullInstitute":"National Oceanic and Atmospheric Administration; National Marine Mammal Laboratory","RoleID":20,"Role":"Data owner","OrigName":null,"StandardName":"National Marine Mammal Laboratory","FullAcronym":"NOAA","ORC":null,"ROR":null},{"OrderNr":2,"Surname":"Goetz","Firstname":"Kimberly","Initials":"K.","PerPublicFlag":1,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":null,"OrigNameLangCode":null,"OrigNameLangID":null,"FullOrigName":null,"InsOwnerCNT":1,"PersID":26646,"InsID":5830,"FullInstitute":"Duke University","RoleID":24,"Role":"Contact","OrigName":null,"StandardName":"Duke University","FullAcronym":null,"ORC":null,"ROR":null},{"OrderNr":3,"Surname":"Waite","Firstname":"Janice","Initials":"J.","PerPublicFlag":1,"AdrID":153127,"Email":"Janice.Waite@noaa.gov","InsPublicFlag":1,"Acronym":null,"OrigNameLangCode":null,"OrigNameLangID":null,"FullOrigName":null,"InsOwnerCNT":2,"PersID":26645,"InsID":1120,"FullInstitute":"National Oceanic and Atmospheric Administration; National Marine Mammal Laboratory","RoleID":24,"Role":"Contact","OrigName":null,"StandardName":"National Marine Mammal Laboratory","FullAcronym":"NOAA","ORC":null,"ROR":null}],"taxterms":[{"DasTaxtTypID":1,"DasTaxtType":"Taxonomic coverage","TaxtID":19013,"TaxTerm":"Cetacea","AphiaID":2688,"DutchTerm":"Walvissen"}],"frameworks":null,"otherterms":null,"temporal":[{"DasDateID":2777,"StartYear":1993,"EndYear":1993,"StartDay":23,"EndDay":3,"StartDate":"1993-09-23","EndDate":"1993-10-03","DasDate":null,"Resolution":null,"ResolutionNL":null,"Notes":null,"StartMonth0":9,"StartMonth":"September","StartMonthNL":"September","EndMonth0":10,"EndMonth":"October","EndMonthNL":"Oktober","Progress":"Completed","ProgressNL":"Afgelopen"}],"geographical":[{"GeoTerm":"Pacific Ocean","DasGeoID":6028,"DasGeoTerm":null,"DasID":3346,"GeotID":2250,"X":null,"Y":null,"MaxX":null,"MaxY":null,"StationName":null,"Precision":null,"CoordSystID":null,"GeoDatumID":null,"OrigCoordMinX":null,"OrigCoordMinY":null,"OrigCoordMaxX":null,"OrigCoordMaxY":null,"OrderNr":null,"Projection":null,"GeoDatum":null,"GeoObjectID":1903,"OrigGeoTerm":"Pacific Ocean","DutchTerm":null}],"meastypes":null,"dasthemes":[{"DasThemeID":70,"DasTheme":"Biology > Mammals","DasTheme0":"Mammals","DutchTerm":"Zoogdieren"}],"projects":null,"refs":[{"0":248356,"BRefID":248356,"1":"Based on this dataset","Relation":"Based on this dataset","2":2,"RelationID":2,"3":"Dahlheim, M.E.; White, P.A.; Waite, J.M. 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