NMML Harbor porpoise Aerial Survey, Kodiak Island, Replicate 1, 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 Kodiak Island. 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 off Kodiak Island was 1.41 (SE = .13)
and 1.85 groups/100 km^2 (SE=6.03).
提供机构：
SCIOPS
