NMML Small Cetacean Aerial Survey 1997 ...

• Main Author: Hobbs, Roderick
• Format: Dataset
• Language: English
• Published: OBIS-SEAMAP 2021
• Subjects: Occurrence,Aircraft,Sightings,harbor porpoise,survey,aerial survey,cetacean; Observation; Occurrence; Bering Sea; Gulf of Alaska; Beluga; Beluga*; Alaska
• Online Access: https://dx.doi.org/10.15468/44vz4g; https://www.gbif.org/dataset/cb6a64b7-d290-4b7c-a23c-052882c96d83

Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: Aerial surveys was conducted in 1997 progressing from east to west, to estimate abundance of the Southeast Alaska (SEA, 9,844 km survey effort), Gulf of Alaska (GOA, 10,127 km survey effort), and Bering Sea (BS, 7849 km survey effort) harbor porpoise stocks. In addition, 1355 km of survey effort during a Cook Inlet beluga survey were analyzed to add to the coverage for the GOA stock. Data from an independent observer concentrating on the trackline was used to estimate perception bias. Significant differences in g(0) and effective strip width (ESW) were found between the survey conducted in 1997 and the 1998 and 1999 surveys, therefore 1997 was treated separately. In both analyses, g(0) was dependent on visibility reported by observers, and in the 1997 data ESW was dependent as well. The 1997 survey included the inland waters of southeastern Alaska and the eastern Gulf of Alaska from Dixon ...