Dataset record
- Type
- Dataset
- title in English
- NMML Harbor Porpoise Aerial Survey, Bristol Bay, Replicate 3, 1991
- Description in English
- Abstract
From 4 to 13 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 Bristol Bay. A Twin Otter was used as the survey platform and was flown at an altitude of 152.2 m (500 ft) and at an airspeed of 185 km/h. The third of three identical sawtooth track lines was flown along the south side of Bristol Bay. 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 Bristol Bay was 1.17 (SE = 0.35) and 4.48 groups/100 km2 (SE = 1.38).
Purpose
Although harbor porpoises, Phocoena phocoena, are known to occur throughout Alaska waters, few estimates of abundance exist. In 1991, the National Marine Mammal Laboratory initiated a 3 year study on Alaska harbor porpoises. The objectives of this program were to:
1) Obtain minimum population estimates in coastal waters using line transect methodology with a coefficient of variation for density estimates of less than 30% for each survey area, and
2) Establish a baseline for detecting changes in abundance through time, for analysis of trends.
During the present study, it was not fiscally possible to survey all areas of the state in any one year. Accordingly, we selected sections of the state to survey in consecutive years to maximize the likelihood of including all of the animals for a particular area surveyed while minimizing the likelihood of significant movement between areas among survey years.
- Abstract in English
- Data from an aerial survey throughout the coastal waters of Bristol Bay conducted to study the Alaska harbor porpoise (Phocoena phocoena) in August 1991.
- License
- https://spdx.org/licenses/CC-BY-NC-4.0.html
- bibliographicCitation
- Dahlheim, M., A. York, R. Towell, J. Waite, and J. Breiwick. 2000. Harbor porpoise (Phocoena phocoena) abundance in Alaska: Bristol Bay to southeast Alaska, 1991-1993. Marine Mammal Science. 16(1): 28-45
- Version
- 1
Temporal coverage
- Temporal
-
- Start date
- 1991-08-06
- End date
- 1991-08-12
Themes
- theme
- Biology > Mammals
Taxonomic terms
- Taxon
keywords
- Cetacea