NMML Harbor Porpoise Aerial Survey, SE Alaska, 1991
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下载链接：
https://seamap.env.duke.edu/dataset/142
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资源简介：
Original provider:
National Marine Mammal Laboratory
Dataset credits:
National Marine Mammal Laboratory
Abstract:
On 15 August 1991, as part of a larger study, Alaska harbor porpoise (<i>Phocoena phocoena</i>) abundance was investigated during an aerial survey of waters off southeastern Alaska. A Twin Otter was used to fly a single sawtooth trackline 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.
提供机构：
OBIS-SEAMAP
创建时间：
2025-07-31
