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Beluga whale (Delphinapterus leucas) aerial survey in Cook Inlet, Alaska, conducted by Alaska Fisheries Scientific Center, Marine Mammal Laboratory from 1993-06-02 to 2022-06-18 (NCEI Accession 0133936)
The National Marine Fisheries Service (NMFS) has conducted aerial counts of Cook Inlet beluga whales (Delphinapterus leucas) from 1993 to 2022 (excluding 2013). Nearly all counts were conducted during the month of June. The routine nature of these counts and the consistency in research protocol lend themselves to inter-annual trend analyses. Beginning in 2005, an aerial survey was added during the month of August to document calving groups within the upper Inlet (north of East and West Foreland). Research protocol has been based on paired observers on the shoreward side of the aircraft and a single observer and computer operator on the offshore side independently searching for marine mammals. Data on environmental conditions, time, location, species, and inclinometer angle were collected for each sighting. The counting protocol included multiple passes near each beluga group while simultaneously collecting video footage. The counting system and observer performance has been tested through paired, independent observational effort. Aerial observer counts are used to calculate median counts for each beluga group to provide a daily index for the population prior to calculating the abundance estimate. Video has been used to count the number of animals in the group to correct for missed animals in the observer counts (perception bias). One video camera had a lens set at a wide angle to view the entire beluga group while the second video camera was zoomed to approximately 10x to magnify a subsample of individual whales in the group. The zoomed video has been used to examine color ratios of white adults relative to smaller and darker juveniles and calves and correct for those individuals missed due to their size or coloration. Aerial counts and video footage of beluga whales provide the fundamental data used to calculate the abundance of and a calving index for the Cook Inlet population. The abundance estimates are applied to trends analyses to determine the status of the stock. Three datasets are included here that contain basic survey data such as latitude, longitude and sightings, as well as the counts of beluga whale groups made by the aerial observers and the results from video analysis from data collected on surveys.
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Beluga whale (Delphinapterus leucas) presence and survey effort collected during visual surveys from aerial platforms by the Alaska Beluga Whale Committee in the Eastern Bering Sea from 1992-05-27 to 2000-06-20 (NCEI Accession 0276222)
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During the years 1992-1995 and 1999-2000, the National Oceanic and Atmospheric Administration provided funds for the Alaska Beluga Whale Committee (ABWC) to conduct studies of belugas in Alaska. Part of the ABWC research program consisted of aerial surveys of western Alaska beluga stocks, including the Eastern Bering Sea (EBS) stock. In 1992, several aerial surveys were conducted during three periods: 27-29 May, 17-21 June, and 18-22 September to assess the distribution of belugas during those periods. The surveys found relatively few belugas in May and September, but a large number of belugas in June. Based on those results, surveys in subsequent years were conducted only in June: 14-18 June 1993, 11-16 June 1994, 5-8 and 20-22 June 1995, 15-17 June 1999, and 17-20 June 2000. This dataset contains aerial survey data from the surveys described above.
Cook Inlet Beluga Opportunistic Sightings, 1975 to 2015 (NCEI Accession 0142326)
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As a part of National Marine Fisheries Service (NMFS) management of the endangered Cook Inlet beluga whale population, a database of opportunistic beluga whale sightings was compiled from reports made by the general public, aircraft patrols, wildlife surveys, and military and industry monitoring studies. Sightings are reported to NMFS Alaska Regional (AKR) office personnel either by voice- or e-mail. Sighting data are then transcribed and sent to the NMFS National Marine Mammal Laboratory (NMML) for entry into the database. Data are first assessed for quality during transcription by NMFS AKR personnel. Secondary review and confirmation is undertaken by NMFS NMML personnel prior to entry of data into the Access Database.
Photo-identification of Beluga Whales in Cook Inlet, Alaska: groups encountered and individuals identified since 2018
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This collection documents the date, group ID, group size, group composition, and location for each group of beluga whale encountered during surveys conducted in Upper Cook Inlet Alaska during ice-free months. It also documents individuals identified in photographs taken during these surveys. Data were collected in field notes, vessel GPS track lines (where appropriate) and GIS software and is available in spreadsheet format.