NMML Harbor Porpoise Aerial Survey, Alaska Peninsula, Replicate 2, 1992
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资源简介：
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 the south side of the Alaska Peninsula. Employing a Twin Otter as the
survey platform, the second of two 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 off the
south side of the Alaska Peninsula was 1.1 (SE = .10) and 2.03 groups/100 km^2
(SE=1.65).
提供机构：
SCIOPS
