Occurrence

NMML Harbor Porpoise Vessel Survey, SE Alaska, Spring 1991

Latest version published by OBIS-SEAMAP on 24 April 2021 OBIS-SEAMAP
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Publication date:
24 April 2021
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Download the latest version of this resource data as a Darwin Core Archive (DwC-A) or the resource metadata as EML or RTF:

Data as a DwC-A file download 382 records in English (36 KB) - Update frequency: not planned
Metadata as an EML file download in English (14 KB)
Metadata as an RTF file download in English (12 KB)

Description

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, 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. The ability of the observers to sight porpoise was sensitive to environmental conditions. As expected, when conditions deteriorated the number of porpoises observed declined. Supplemental information: This dataset and associated effort data were updated on September 8, 2005. Those who downloaded them before that date should renew them.

Data Records

The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 382 records.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.

Versions

The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

Dahlheim, M. E., P. A. White, J. M. Waite. 2009. Cetaceans of Southeast Alaska: distribution and seasonal occurrence. Journal of Biogeography. 36: 410-426.

Rights

Researchers should respect the following rights statement:

The publisher and rights holder of this work is OBIS-SEAMAP. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC 4.0) License.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 889345d0-8008-45cc-a169-37ee0289baa5.  OBIS-SEAMAP publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Ocean Biodiversity Information System.

Keywords

Occurrence,harbor porpoise,Phocoena phocoena,abundance,marine mammal survey,survey,marine mammal,cetacean,Vessels,Sightings; Observation; Occurrence

External data

The resource data is also available in other formats

OBIS-SEAMAP Dataset Page http://seamap.env.duke.edu/dataset/146 UTF-8 Interactive map
FGDC Metadata http://seamap.env.duke.edu/dataset/146/xml UTF-8 XML

Contacts

Kimberly Goetz
  • Owner
  • Originator
  • Point Of Contact
Primary contact
Duke University
Janice Waite
  • Owner
  • Originator
  • Point Of Contact
Primary contact
National Marine Mammal Laboratory
OBIS-SEAMAP
  • Metadata Provider
  • Distributor
Marine Geospatial Ecology Lab, Duke University
A328 LSRC building
27708 Durham
NC
US

Geographic Coverage

Southeast Alaska,Bristol Bay,Cook Inlet

Bounding Coordinates South West [55.213, -136.763], North East [59.023, -130.919]

Taxonomic Coverage

Scientific names are based on the Integrated Taxonomic Information System (ITIS).

Order Cetacea (cetaceans), Cetacea (cetaceans)
Species Phocoenoides dalli (Dall's Porpoise), Phocoena phocoena (Harbor Porpoise), Megaptera novaeangliae (Humpback Whale), Orcinus orca (Killer Whale), Balaenoptera acutorostrata (Minke Whale), Lagenorhynchus obliquidens (Pacific White-sided Dolphin)

Temporal Coverage

Start Date / End Date 1991-04-20 / 1991-05-03

Project Data

No Description available

Title NMML Harbor Porpoise Vessel Survey, SE Alaska, Spring 1991
Funding NA

The personnel involved in the project:

Kimberly Goetz
  • Owner
Janice Waite
  • Owner

Sampling Methods

NA

Study Extent NA

Method step description:

  1. NA

Collection Data

Collection Name zd_146
Collection Identifier zd_146
Parent Collection Identifier OBIS-SEAMAP

Additional Metadata

marine, harvested by iOBIS

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. The ability of the observers to sight porpoise was sensitive to environmental conditions. As expected, when conditions deteriorated the number of porpoises observed declined.
Alternative Identifiers http://ipt.env.duke.edu/resource?r=zd_146