Description
Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: In fall 1993, the Alaskan panhandle and Prince William Sound were 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 289 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. White, P. A., and 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: 56dde455-657c-4e32-b1f1-c0eda47d7d70. OBIS-SEAMAP publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Ocean Biodiversity Information System.
Keywords
Occurrence,Vessels,Sightings,harbor porpoise,Phocoena phocoena,abundance,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/154 UTF-8 Interactive map |
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FGDC Metadata | http://seamap.env.duke.edu/dataset/154/xml UTF-8 XML |
Contacts
- Owner ●
- Originator ●
- Point Of Contact
- Metadata Provider ●
- Distributor
Geographic Coverage
Alaska,Alaskan panhandle,Prince William Sound
Bounding Coordinates | South West [55.776, -136.867], North East [58.944, -132.272] |
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Taxonomic Coverage
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
Order | Cetacea (cetaceans), Cetacea (cetaceans) |
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Species | Phocoenoides dalli (Dall's Porpoise), Phocoena phocoena (Harbor Porpoise), Megaptera novaeangliae (Humpback Whale), Orcinus orca (Killer Whale), Balaenoptera acutorostrata (Minke Whale) |
Temporal Coverage
Start Date / End Date | 1993-09-23 / 1993-10-03 |
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Project Data
No Description available
Title | NMML Harbor Porpoise Vessel, SE Alaska, Fall 1993 |
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Funding | NA |
The personnel involved in the project:
- Owner
- Owner
Sampling Methods
NA
Study Extent | NA |
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Method step description:
- NA
Collection Data
Collection Name | zd_154 |
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Collection Identifier | zd_154 |
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. |
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Alternative Identifiers | http://ipt.env.duke.edu/resource?r=zd_154 |