10.82144/04d13dd0 dcc94d36-ba8b-4ccb-8a48-d92c0e5e98f9 https://seamap.env.duke.edu/dataset/41 50b1b06d-f311-43f2-ad72-c7f05a9c1771 zd_41 Thomas P.DohlUniversity of California, Santa CruzPrimary contact unknown@dummy.com OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu distributor Thomas P.DohlUniversity of California, Santa CruzPrimary contact unknown@dummy.com owner 2026-04-28 eng Original provider: Minerals Management Service Dataset credits: Minerals Management Service Abstract: This dataset is from the marine mammal and seabird surveys of central and northern California studies: Central/northern California - low aerial [birds and mammals] study code: CL, Contract number: 14-12-0001-29090, Principal investigator: Thomas P. Dohl, Center for Marine Studies, University of California, Santa Cruz Time period: February 1980 through June 1983 Study area: Shelf, slope, and offshore waters to a distance of 100 nm off the California coast from Point Conception to the California-Oregon boundary. Methodology: Offshore transect surveys were flown twice-monthly at two different altitudes (200 ft and about 750-1,000 ft ASL) along approximately 40 east-west transect lines extending an average of 60 nm offshore. The transects sampled on a given survey were selected randomly from a set of 92 standard (predetermined) lines spaced at intervals of 5' of latitude. Standard transects provided systematic coverage of shelf, slope, and offshore waters in the study area. Sightings of seabirds, pinnipeds, and sea otters were recorded only on low-altitude surveys. Sightings of cetaceans and turtles were recorded on both low- and high-altitude surveys. Seabird sightings were recorded only on the shaded side of the aircraft within a strip transect of 50 m width. Marine mammal and turtle sightings were recorded within an unbounded corridor on both high- and low-altitude surveys, but only the shaded side of the aircraft was searched on the low-altitude surveys. Cross-legs connecting standard transects were searched only on high-altitude surveys. Offshore cross-legs were searched on both sides of the aircraft, while only the nearshore side was searched on cross-legs along the coast. Declination angle was measured and noted for each marine mammal/turtle sightings and later used to calculate a probability density function of frequency with right-angle sighting distance. Navigation was by Loran and VLF-Omega. Databases produced: Three databases of sightings at sea were produced by these studies (data on numbers of seabirds and pinnipeds on land were also collected but are not addressed in the present study). These include: 1) sightings of cetaceans and turtles recorded on 36 high-altitude aerial surveys, 2) sightings of cetaceans, pinnipeds, sea otters, and turtles recorded on 36 low-altitude aerial surveys, and 3) sightings of seabirds on 36 low-altitude aerial surveys. Each sighting database is accompanied by files providing the search effort on transect and environmental characteristics of the waters surveyed (e.g., sea surface temperature). OccurrenceGBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xmlObservationGBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml Marine BiologyVisual sightingMarine Animal SurveyMarine mammalsSeabirdsSea turtlesVesselVisual Sighting N/A This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License. https://seamap.env.duke.edu/dataset/41 Northeastern Pacific Ocean -126.4833 42.072 42.072 34.0333 1980-02-25 1983-01-29 Scientific names are based on the Integrated Taxonomic Information System (ITIS). speciesAechmophorus occidentalisWestern grebe familyAlcidaeMurres familyAnatidaeDucks speciesArdea albaGreat egret speciesArdea herodiasGreat blue heron classAvesBirds genusAythyaDiving ducks genusBalaenopteraBaleen whales speciesBalaenoptera acutorostrataCommon minke whale speciesBalaenoptera musculusBlue whale speciesBalaenoptera physalusFin whale speciesBerardius bairdiiBaird's beaked whale speciesBrachyramphus marmoratusMarbled murrelet subspeciesBranta bernicla nigricans subspeciesBranta canadensis interior speciesCallorhinus ursinusNorthern fur seal suborderCaniformiaPinnipeds speciesCepphus columbaPigeon guillemot speciesCerorhinca monocerataRhinoceros auklet orderCetaceaCetaceans familyCheloniidaeSea turtles speciesChroicocephalus philadelphiaBonaparte's gull orderCiconiiformesCiconiiformes speciesDelphinus delphisShort-beaked common dolphin speciesDermochelys coriaceaLeatherback sea turtle speciesEnhydra lutrisSea otter speciesEschrichtius robustusGray whale speciesEumetopias jubatusSteller sea lion speciesFratercula cirrhataTufted puffin speciesFratercula corniculataHorned puffin genusFulmarus speciesFulmarus glacialisNorthern fulmar genusGaviaLoons speciesGavia immerCommon loon speciesGavia stellataRed-throated loon speciesGlobicephala melasLong-finned pilot whale speciesGrampus griseusRisso's dolphin speciesHydroprogne caspiaCaspian tern speciesLagenorhynchus obliquidensPacific white-sided dolphin familyLaridaeGulls genusLarusGulls speciesLarus argentatusHerring gull speciesLarus californicusCalifornia gull speciesLarus canusMew gull speciesLarus delawarensisRing-billed gull speciesLarus glaucescensGlaucous-winged gull speciesLarus heermanniHeermann's gull speciesLarus occidentalisWestern gull speciesLimosa fedoaMarbled godwit speciesLissodelphis borealisNorthern right whale dolphin speciesMegaptera novaeangliaeHumpback whale genusMelanittaScoters speciesMelanitta fuscaVelvet scoter speciesMelanitta nigraBlack scoter speciesMelanitta perspicillataSurf scoter speciesMergus serratorRed-breasted merganser genusMesoplodonBeaked whales speciesMirounga angustirostrisNorthern elephant seal speciesOceanodroma furcataFork-tailed storm petrel speciesOceanodroma homochroaAshy storm petrel speciesOceanodroma leucorhoaLeach's storm petrel speciesOceanodroma melaniaBlack storm petrel speciesOrcinus orcaKiller whale speciesPandion haliaetusOsprey speciesPelecanus erythrorhynchosAmerican white pelican speciesPelecanus occidentalisBrown pelican genusPhaethonTropicbirds genusPhalacrocoraxCormorants subspeciesPhalacrocorax brasilianus brasilianus speciesPhalacrocorax pelagicusPelagic cormorant speciesPhalacrocorax penicillatusBrandt's cormorant genusPhalaropusPhalaropes speciesPhalaropus fulicariusRed phalarope speciesPhalaropus lobatusRed-necked phalarope speciesPhoca vitulinaHarbor seal speciesPhocoena phocoenaHarbor porpoise speciesPhocoenoides dalliDall's porpoise speciesPhoebastria immutabilisLaysan albatross speciesPhoebastria nigripesBlack-footed albatross speciesPhyseter macrocephalusSperm whale speciesPodiceps nigricollisBlack-necked grebe familyProcellariidaeFulmars / petrels / shearwaters genusPterodroma speciesPtychoramphus aleuticusCassin's auklet speciesPuffinus bulleriBuller's shearwater speciesPuffinus carneipesFlesh-footed shearwater speciesPuffinus creatopusPink-footed shearwater speciesPuffinus griseusSooty shearwater speciesPuffinus puffinusManx shearwater speciesPuffinus tenuirostrisShort-tailed shearwater speciesRissa tridactylaBlack-legged kittiwake genusStercorariusJaegers speciesStercorarius longicaudusLong-tailed jaeger speciesStercorarius maccormickiSouth polar skua speciesStercorarius parasiticusParasitic jaeger speciesStercorarius pomarinusPomarine jaeger genusSternaTypical Terns speciesSterna forsteriForster's tern speciesSterna hirundoCommon tern speciesSterna paradisaeaArctic tern speciesSynthliboramphus antiquusAncient murrelet speciesSynthliboramphus hypoleucusXantus's murrelet speciesThalasseus elegansElegant tern speciesThalasseus maximusRoyal tern speciesUria aalgeCommon murre speciesXema sabiniSabine's gull speciesZalophus californianusCalifornia sea lion speciesZiphius cavirostrisCuvier's beaked whale To determine species composition, distribution, abundance, and seasonal variation for marine mammal and seabird populations, provide a description of habitat use, and identify areas of special biological importance to these populations in the central and northern California study area. notPlanned Thomas P.DohlUniversity of California, Santa CruzPrimary contact unknown@dummy.com NA NA NA Thomas P.Dohlowner NA 2026-04-28T11:27:06-04:00 dataset Dohl, T. 2020. MMS Low Altitude Survey 1980-1983. Version 2.1.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/04d13dd0. Bonnell, M.L., M.O. Pierson and G.D. Farrens. 1983. Pinnipeds and sea otters of central and northern California, 1980-1983: Status, abundance, and distribution. Part of Investigator’s Final Report, Marine Mammal and Seabird Study, Central and Northern California, Contract No. 14-12-0001-29090. Prepared by Center for Marine Sciences, University of California, Santa Cruz, for the Pacific OCS Region, Minerals Management ServiceOCS Study MMS 84-0044. 220 pp. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/41 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/41/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/41/eml OBIS-SEAMAP zd_41 zd_41