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NMML Harbor porpoise Aerial Survey, Kodiak Island, Replicate 1, 1992

Entry ID: seamap132

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Summary

Abstract: 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).

Purpose: Although harbor porpoises, Phocoena phocoena, are known to occur
throughout Alaska waters (Fiscus et al. 1976; Leatherwood and Reeves 1978;
Lawry et al. 1982; Leatherwood et al. 1983), few estimates of abundance exist.
In 1991, the National Marine Mammal Laboratory initiated a 3-yr study on Alaska
harbor porpoises. The objectives of this program were to: 1) Obtain minimum
...

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Link: GET DATA

Description: Access data from the OBIS and OBIS-SEAMAP websites.

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Geographic Coverage

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Spatial coordinates

N: 58.69

S: 56.28

E: -151.49

W: -155.02

Data Set Citation

Dataset Originator/Creator: National Marine Mammal Laboratory

Dataset Title: NMML Harbor porpoise Aerial Survey, Kodiak Island, Replicate 1, 1992

Dataset Series Name: OBIS-SEAMAP

Dataset Release Date: 2004-08-09 16:46:17.916039-04

Dataset Release Place: http://seamap.env.duke.edu/

Dataset Publisher: OBIS-SEAMAP

Data Presentation Form: vector digital data

Online Resource: http://nmml.afsc.noaa.gov/

Parent DIF

This data set description is a member of a collection. The collection is described in
OBIS-SEAMAP

Temporal Coverage

Start Date: 1992-07-06

Stop Date: 1992-07-30

Location Keywords

CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA > KODIAK ISLAND

Science Keywords

AGRICULTURE > SOILS

BIOSPHERE > TERRESTRIAL ECOSYSTEMS > DESERTS

ISO Topic Category

FARMING

BIOTA

Platform

FIELD SURVEYS

FIELD INVESTIGATION

Project

USGS_PBS > Place-Based Studies

Ancillary Keywords

GIS

Desert

Data Set Progress

IN WORK

Data Center

Mojave Desert, Western Region Geography, Geography Division, U.S. Geological Survey, U.S. Department of the Interior

Data Center URL: http://geography.wr.usgs.gov/mojave/

Data Center Personnel
Name: ALAN MIKUNI Phone: 650-329-4254 Fax: 650-329-4249 Email: amikuni at usgs.gov Contact Address: U.S. Geological Survey Mail Stop 531 345 Middlefield Road City: Menlo Park Province or State: CA Postal Code: 94025-3561 Country: USA