NMML Harbor Porpoise Aerial Survey, Cook Inlet, 1991
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资源简介：
On 1 and 2 August 1991, as part of a larger study, Alaska harbor
porpoise (Phocoena phocoena) abundance was investigated during an aerial survey
throughout the coastal waters of Cook Inlet. A Twin Otter was used to fly a
single sawtooth trackline across Cook Inlet at an altitude of 152.2 m (500ft)
and at an airspeed of 100 kn. 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 for Cook Inlet was 1.33 (SE = .33) and
.54 groups/100 km^2 (SE=.31).
提供机构：
SCIOPS
