NMML Harbor Porpoise Aerial Survey, Kodiak Island, Replicate 2, 1992 ...

Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: On 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 Kodiak Island. Employing a Twin...

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Bibliographic Details
Main Authors: Goetz, Kimberly, Waite, Janice
Format: Dataset
Language:English
Published: OBIS-SEAMAP 2021
Subjects:
Occurrence,Aircraft,Sightings,harbor porpoise,Phocoena phocoena,abundance,aerial survey,marine mammal survey,survey,marine mammal,cetacean
Observation
Occurrence
Kodiak
Phocoena phocoena
Alaska
Online Access:https://dx.doi.org/10.15468/rxt7dx
https://www.gbif.org/dataset/f4cc557b-1c28-4a3e-a0b6-16c511005193
Description
Summary:Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: On 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 Kodiak Island. Employing a Twin Otter as the survey platform, the second of three 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 Kodiak Island was 1.41 (SE = 0.13) and 1.85 groups/100 km2 (SE = 6.03). Purpose: Although harbor porpoises, Phocoena phocoena , are known to occur throughout Alaska waters, few estimates of abundance exist. In 1991, the National Marine Mammal ...

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