Description
Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: Aerial surveys was conducted in 1997 progressing from east to west, to estimate abundance of the Southeast Alaska (SEA, 9,844 km survey effort), Gulf of Alaska (GOA, 10,127 km survey effort), and Bering Sea (BS, 7849 km survey effort) harbor porpoise stocks. In addition, 1355 km of survey effort during a Cook Inlet beluga survey were analyzed to add to the coverage for the GOA stock. Data from an independent observer concentrating on the trackline was used to estimate perception bias. Significant differences in g(0) and effective strip width (ESW) were found between the survey conducted in 1997 and the 1998 and 1999 surveys, therefore 1997 was treated separately. In both analyses, g(0) was dependent on visibility reported by observers, and in the 1997 data ESW was dependent as well. The 1997 survey included the inland waters of southeastern Alaska and the eastern Gulf of Alaska from Dixon Entrance to Cape Suckling Purpose: A 3-year survey began in 1997 to complete a new abundance estimate by 1999. This survey will also include an abundance estimate for Dalls porpoise (Phocoenoides dalli). Once the 3 years of surveys are completed, the data will be used to estimate annual abundance of harbor porpoise and Dalls porpoise, which is one of the key pieces of information needed to manage marine mammal-fishery interactions, as required under the Marine Mammal Protection Act. Supplemental information: Although the previous harbor porpoise surveys (1991- 1993) used a vessel platform for the inside waters of Southeast Alaska (Dahlheim et al. 1992, 1993, 1994), the current survey was conducted entirely from aircraft.
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 602 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:
Hobbs, R. 2004. NMML Small Cetacean Aerial Survey 1997. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/115) on yyyy-mm-dd.
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: cb6a64b7-d290-4b7c-a23c-052882c96d83. 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,survey,aerial survey,cetacean; Observation; Occurrence
External data
The resource data is also available in other formats
| OBIS-SEAMAP Dataset Page | http://seamap.env.duke.edu/dataset/115 UTF-8 Interactive map |
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| FGDC Metadata | http://seamap.env.duke.edu/dataset/115/xml UTF-8 XML |
Contacts
- Owner ●
- Originator ●
- Point Of Contact
- Metadata Provider ●
- Distributor
Geographic Coverage
Alaska,Eastern Alaska,Gulf of Alaska,Dixon Entrance,Cape Suckling
| Bounding Coordinates | South West [54.454, -143.953], North East [60.133, -131.005] |
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Taxonomic Coverage
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
| Order | Cetacea (cetaceans), Cetacea (cetaceans) |
|---|---|
| Genus | Mesoplodon (beaked whales) |
| Species | Balaenoptera physalus (Fin Whale), Eumetopias jubatus (Steller Sea Lion), Eschrichtius robustus (Gray Whale), Lagenorhynchus obliquidens (Pacific White-sided Dolphin), Megaptera novaeangliae (Humpback Whale), Orcinus orca (Killer Whale), Phocoenoides dalli (Dall's Porpoise), Physeter macrocephalus (Sperm Whale), Phocoena phocoena (Harbor Porpoise), Phoca vitulina (Harbor Seal) |
Temporal Coverage
| Start Date / End Date | 1997-05-28 / 1997-07-28 |
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Project Data
No Description available
| Title | NMML Small Cetacean Aerial Survey 1997 |
|---|---|
| Funding | NA |
The personnel involved in the project:
- Owner
Sampling Methods
NA
| Study Extent | NA |
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Method step description:
- NA
Collection Data
| Collection Name | zd_115 |
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| Collection Identifier | zd_115 |
| Parent Collection Identifier | OBIS-SEAMAP |
Additional Metadata
marine, harvested by iOBIS
| Purpose | A 3-year survey began in 1997 to complete a new abundance estimate by 1999. This survey will also include an abundance estimate for Dalls porpoise (Phocoenoides dalli). Once the 3 years of surveys are completed, the data will be used to estimate annual abundance of harbor porpoise and Dalls porpoise, which is one of the key pieces of information needed to manage marine mammal-fishery interactions, as required under the Marine Mammal Protection Act. |
|---|---|
| Alternative Identifiers | http://ipt.env.duke.edu/resource?r=zd_115 |