NMML Harbor Porpoise Aerial Survey, SE Alaska, Replicate 1, 1993
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资源简介：
On 1 to 26 June 1993, as part of a larger study, Alaska harbor
porpoise (Phocoena phocoena) abundance was investigated during an aerial survey
from Prince William Sound to Dixon Entrance. Employing a Twin Otter as the
survey platform, the first of three identical saw-tooth tracklines was flown 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 from Prince
William Sound to Dixon Entrance was 1.22 (SE = .04) and 4.02 groups/100 km^2
(SE=7.42).
提供机构：
SCIOPS
