NMML Harbor Porpoise Vessel Survey, SE Alaska, Spring 1991 ...
Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: In spring 1991, Southeast Alaska, Cook Inlet, and Bristol Bay, was surveyed for harbor porpoise ( Phocoena phocoena ) from the NOAA John N. Cobb using line transect methodology. The ship...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
OBIS-SEAMAP
2021
|
Subjects: | |
Online Access: | https://dx.doi.org/10.15468/3hsqf6 https://www.gbif.org/dataset/889345d0-8008-45cc-a169-37ee0289baa5 |
Summary: | Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: In spring 1991, Southeast Alaska, Cook Inlet, and Bristol Bay, was surveyed for harbor porpoise ( Phocoena phocoena ) from the NOAA John N. Cobb using line transect methodology. The shipboard platform was 28.36 m (93 ft) in length with a bridge height of 4.27 m (14 ft). To obtain data on seasonal movements of porpoise, a limited number of transects were made in areas of known porpoise concentrations. When a sighting was made, the following variables were recorded: time, angle, number of reticles to the sighting, radar distance (nm) to the shoreline at the same angle of the sighting, the species, the count of the porpoise seen (best, high, and low), and the animal(s) direction of travel. Search effort was recoded by noting the time and location of the ship at the beginning and end of each transect. Purpose: Although harbor porpoises, Phocoena phocoena , are known to occur throughout Alaska waters, ... |
---|