Occurrence

NMML Harbor Porpoise Aerial Survey, SE Alaska, Replicate 3, 1993

Latest version published by OBIS-SEAMAP on 24 April 2021 OBIS-SEAMAP
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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 165 records in English (19 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: On 1 to 26 June 1993, as part of a larger study, Alaska harbor porpoise (Phocoena phocoena) abundance was investigated during an aerial survey from Prince William Sound to Dixon Entrance. Employing a Twin Otter as the survey platform, the third of three identical sawtooth tracklines was flown at an altitude of 152.2 m (500 ft) and at an airspeed of 185 km/h. 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 from Prince William Sound to Dixon Entrance was 1.22 (SE = 0.04) and 4.02 groups/100 km2 (SE = 7.42). 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. 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 165 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., 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.

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: 6eea7c9e-2312-41e5-a11a-fe000fe0e84b.  OBIS-SEAMAP publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Ocean Biodiversity Information System.

Keywords

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

External data

The resource data is also available in other formats

OBIS-SEAMAP Dataset Page http://seamap.env.duke.edu/dataset/141 UTF-8 Interactive map
FGDC Metadata http://seamap.env.duke.edu/dataset/141/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,Alaska

Bounding Coordinates South West [54.428, -147.029], North East [60.375, -132.726]

Taxonomic Coverage

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

Order Cetacea (cetaceans), Cetacea (cetaceans)
Species Phocoenoides dalli (Dall's Porpoise), Balaenoptera physalus (Fin Whale), Phocoena phocoena (Harbor Porpoise), Megaptera novaeangliae (Humpback Whale), Orcinus orca (Killer Whale)

Temporal Coverage

Start Date / End Date 1993-06-03 / 1993-06-23

Project Data

No Description available

Title NMML Harbor Porpoise Aerial Survey, SE Alaska, Replicate 3, 1993
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_141
Collection Identifier zd_141
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. 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.
Alternative Identifiers http://ipt.env.duke.edu/resource?r=zd_141