{"datasetrec":{"DasID":3307,"Acronym":null,"StandardTitle":"NMML Small Cetacean Aerial Survey 1999","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":"Dataset from an aerial survey for small cetaceans from 5 June to 4 July, 1999 in Bristol Bay and along southwestern Alaska Peninsula conducted by the National Marine Mammal Laboratory (NMML).","EngDescr":"\r\nThe 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).\r\n\r\n\r\nPurpose\r\n\r\nThe current study (1997-1999) will provide new abundance estimates for each stock of harbor porpoise and Dall's porpoise.\r\n\r\nAlthough 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).","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":null,"AccessConstraints":null,"UDate":"2012-11-13","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":"<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":"Hobbs","Firstname":"Roderick","Initials":"R.","PerPublicFlag":1,"AdrID":153360,"Email":"Rod.Hobbs@noaa.gov","InsPublicFlag":1,"Acronym":null,"OrigNameLangCode":null,"OrigNameLangID":null,"FullOrigName":null,"InsOwnerCNT":2,"PersID":26842,"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"},{"DasTaxtTypID":1,"DasTaxtType":"Taxonomic coverage","TaxtID":19014,"TaxTerm":"Pinnipedia","AphiaID":148736,"DutchTerm":"Zeeroofdieren"}],"frameworks":null,"otherterms":null,"temporal":[{"DasDateID":2738,"StartYear":1999,"EndYear":1999,"StartDay":11,"EndDay":4,"StartDate":"1999-06-11","EndDate":"1999-07-04","DasDate":null,"Resolution":null,"ResolutionNL":null,"Notes":null,"StartMonth0":6,"StartMonth":"June","StartMonthNL":"Juni","EndMonth0":7,"EndMonth":"July","EndMonthNL":"Juli","Progress":"Completed","ProgressNL":"Afgelopen"}],"geographical":[{"GeoTerm":"Pacific Ocean","DasGeoID":5986,"DasGeoTerm":null,"DasID":3307,"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":null,"urls":[{"URL":"https://obis.org/dataset/0124b64b-16f3-40ec-b1a1-d8e9b2b7171f","externalID":"0124b64b-16f3-40ec-b1a1-d8e9b2b7171f","URLTypeCode":null,"URLType":"Online dataset","URLTypID":19,"downloadURL":null,"FileName":null},{"URL":"seamap.env.duke.edu/dataset/117","externalID":"117","URLTypeCode":null,"URLType":"Dataset information","URLTypID":17,"downloadURL":null,"FileName":null}],"pictures":null,"urlmaps":null,"spatreps":null,"fileformats":null,"resmessage":"","complete":1}