{"datasetrec":{"DasID":3342,"Acronym":null,"StandardTitle":"NMML Harbor Porpoise Aerial Survey, Alaska Peninsula, Replicate 1, 1992","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 off the south side of the Alaska Peninsula conducted to study the Alaska harbor porpoise (Phocoena phocoena) in summer 1992.","EngDescr":"Abstract\r\n\r\nOn 6 July to 9 August 1992, as part of a larger study, Alaska harbor porpoise (Phocoena phocoena) abundance was investigated during an aerial survey off the south side of the Alaska Peninsula. Employing a Twin Otter as the survey platform, the first of two identical sawtooth tracklines was flown at an altitude of 152.2 m (500 ft) and at an airspeed of 185 km/h. Line-transect methodology was used, and only those observations made during optimal conditions were analyzed. Density of harbor porpoises was calculated using line transect estimates based on perpendicular distances of sightings to the cruise track of the airplane. On average, porpoise group size and density off the south side of the Alaska Peninsula was 1.1 (SE = 0.10) and 2.03 groups/100 km2 (SE = 1.65).\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\nDuring the present study, it was not fiscally possible to survey all areas of the state in any one year. Accordingly, we selected sections of the state to survey in consecutive years to maximize the likelihood of including all of the animals for a particular area surveyed while minimizing the likelihood of significant movement between areas among survey years.","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. York, R. Towell, J. Waite, and J. Breiwick. 2000. Harbor porpoise (Phocoena phocoena) abundance in Alaska: Bristol Bay to southeast Alaska, 1991-1993. Marine Mammal Science. 16(1): 28-45","AccessConstraints":null,"UDate":"2012-11-14","CDate":"2012-11-13","CurrencyDate":null,"RevisionDate":null,"DateLastModified":{"date":"2026-06-05 01:37:23.644310","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":"<a rel=\"license\" href=\"https://creativecommons.org/licenses/by-nc/4.0/\" target=\"_blank\"><img alt=\"Creative Commons License\" style=\"border:0px;height:15px;width:80px;vertical-align:middle;\" src=\"https://www.marinespecies.org/aphia/images/cc/by-nc.png\" /></a> This dataset is licensed under a <a rel=\"license\" href=\"https://creativecommons.org/licenses/by-nc/4.0/\" target=\"_blank\">Creative Commons Attribution-NonCommercial 4.0 International License</a>.","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":2773,"StartYear":1992,"EndYear":1992,"StartDay":29,"EndDay":29,"StartDate":"1992-07-29","EndDate":"1992-07-29","DasDate":null,"Resolution":null,"ResolutionNL":null,"Notes":null,"StartMonth0":7,"StartMonth":"July","StartMonthNL":"Juli","EndMonth0":7,"EndMonth":"July","EndMonthNL":"Juli","Progress":"Completed","ProgressNL":"Afgelopen"}],"geographical":[{"GeoTerm":"Pacific Ocean","DasGeoID":6024,"DasGeoTerm":null,"DasID":3342,"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":248355,"BRefID":248355,"1":"Based on this dataset","Relation":"Based on this dataset","2":2,"RelationID":2,"3":"<b>Dahlheim, M. <i>et al.</i></b> (2000). Harbor porpoise (<i>Phocoena phocoena</i>) abundance in Alaska: Bristol Bay to southeast Alaska, 1991-1993. <i>Mar. Mamm. Sci. 16(1)</i>: 28-45. <a href=\"http://dx.doi.org/10.1111/j.1748-7692.2000.tb00902.x\" target=\"_blank\">http://dx.doi.org/10.1111/j.1748-7692.2000.tb00902.x</a>","RR":"<b>Dahlheim, M. <i>et al.</i></b> (2000). Harbor porpoise (<i>Phocoena phocoena</i>) abundance in Alaska: Bristol Bay to southeast Alaska, 1991-1993. <i>Mar. Mamm. Sci. 16(1)</i>: 28-45. <a href=\"http://dx.doi.org/10.1111/j.1748-7692.2000.tb00902.x\" target=\"_blank\">http://dx.doi.org/10.1111/j.1748-7692.2000.tb00902.x</a>","4":"Harbor porpoise (<i>Phocoena phocoena</i>) abundance in Alaska: Bristol Bay to southeast Alaska, 1991-1993","StT":"Harbor porpoise (<i>Phocoena phocoena</i>) abundance in Alaska: Bristol Bay to southeast Alaska, 1991-1993","5":"Dahlheim, M.; York, A.; Towell, R.; Waite, J.; Breiwick, J.","RSA":"Dahlheim, M.; York, A.; Towell, R.; Waite, J.; Breiwick, J.","6":"Gebaseerd op deze dataset","DutchTerm":"Gebaseerd op deze dataset","7":2000,"AnaDate":2000,"8":null,"MonDate":null,"9":". <i>Mar. Mamm. Sci. 16(1)</i>: 28-45. <a href=\"http://dx.doi.org/10.1111/j.1748-7692.2000.tb00902.x\" target=\"_blank\">http://dx.doi.org/10.1111/j.1748-7692.2000.tb00902.x</a>","":". <i>Mar. Mamm. Sci. 16(1)</i>: 28-45. <a href=\"http://dx.doi.org/10.1111/j.1748-7692.2000.tb00902.x\" target=\"_blank\">http://dx.doi.org/10.1111/j.1748-7692.2000.tb00902.x</a>","10":"http://dx.doi.org/10.1111/j.1748-7692.2000.tb00902.x","doi":"http://dx.doi.org/10.1111/j.1748-7692.2000.tb00902.x"}],"urls":[{"URL":"https://obis.org/dataset/603686c5-e5ee-431d-9436-b9168acddfe9","externalID":"603686c5-e5ee-431d-9436-b9168acddfe9","URLTypeCode":null,"URLType":"Online dataset","URLTypID":19,"downloadURL":null,"FileName":null},{"URL":"seamap.env.duke.edu/dataset/135","externalID":"135","URLTypeCode":null,"URLType":"Dataset information","URLTypID":17,"downloadURL":null,"FileName":null}],"pictures":null,"urlmaps":null,"spatreps":null,"fileformats":null,"resmessage":"","complete":1}