Description
Original provider: National Marine Mammal Laboratory Dataset credits: National Marine Mammal Laboratory Abstract: The National Marine Mammal Laboratory (NMML) conducted an aerial survey for small cetaceans from 5 June to 4 July, 1999 in Bristol Bay and along southwestern Alaska Peninsula (out to the 1,829 m [1,000 fm] depth contour). A total of 8,522 km were surveyed in a Dehavilland Twin Otter at 152.5 m (500 ft) altitude and 185 km/hr (100 kts). Two overlapping sawtooth lines were designed along the coastline of Bristol Bay. Both sides of each sawtooth were approximately 37 km with a 46 km base. Large bays were also included in the survey. Primary observers searched through bubble windows on the left and right sides of the aircraft and reported sightings to a computer operator. To estimate a perception bias correction factor for this study, an independent observer was added at a belly window position to determine the number of animals in the immediate vicinity of the trackline that were missed by the primary observers. There were 215 sightings of harbor porpoise (260 individuals), 12 Dall's porpoise (24 individuals), and 16 Pacific white-sided dolphins (170 individuals) while surveying tracklines. Additional cetacean sightings included 12 gray whales (13 individuals), 18 humpback whales (29 individuals), 8 minke whales (13 individuals), and 3 killer whales (11 individuals). Purpose: The current study (1997-1999) will provide new abundance estimates for each stock of harbor porpoise and Dall's porpoise. 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. However, a concurrent vessel survey in a selected portion of southeastern Alaska and a calibration study with the survey vessel. We report here the results from the third year of surveys (1999). References: Dahlheim, M., A. York, J. Waite, and C. Goebel-Diaz. 1992. Abundance and distribution of harbor porpoise (Phocoena phocoena) in southeast Alaska, Cook Inlet and Bristol Bay. Annual report to the MMPA Assessment Program, Office of Protected Resources, NMFS, NOAA, 1335 East-West Highway, Silver Spring, MD 20910. Dahlheim, M., A. York, J. Waite, and R. Towell. 1993. Abundance and distribution of harbor porpoise (Phocoena phocoena) in southeast Alaska, Kodiak Island, and the south side of the Alaska Peninsula, 1992. Annual report to the MMPA Assessment Program, Office of Protected Resources, NMFS, NOAA, 1335 East-West Highway, Silver Spring, MD 20910. Dahlheim, M., A. York, J. Waite, and R. Towell. 1994. Abundance and distribution of harbor porpoise (Phocoena phocoena) in southeast Alaska and the offshore waters of Dixon Entrance to Prince William Sound, 1993. Annual report to the MMPA Assessment Program, Office of Protected Resources, NMFS, NOAA, 1335 East-West Highway, Silver Spring, MD 20910.
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 434 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. 2013. NMML Small Cetacean Aerial Survey 1999. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/117) 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: 5c488b46-101b-470d-8b2b-ccf279488c04. OBIS-SEAMAP publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Ocean Biodiversity Information System.
Keywords
Occurrence,aerial survey,survey,arial,cetacean,porpoise,Aircraft,Sightings; Observation; Occurrence
External data
The resource data is also available in other formats
OBIS-SEAMAP Dataset Page | http://seamap.env.duke.edu/dataset/117 UTF-8 Interactive map |
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FGDC Metadata | http://seamap.env.duke.edu/dataset/117/xml UTF-8 XML |
Contacts
- Owner ●
- Originator ●
- Point Of Contact
- Metadata Provider ●
- Distributor
Geographic Coverage
Alaska,Gulf of Alaska,Southeast Alaska,Bristol Bay,Bering Sea
Bounding Coordinates | South West [53.934, -164.769], North East [59.071, -157.071] |
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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 | Balaenoptera acutorostrata (Minke Whale), Eumetopias jubatus (Steller Sea Lion), Eschrichtius robustus (Gray Whale), Lagenorhynchus obliquidens (Pacific White-sided Dolphin), Megaptera novaeangliae (Humpback Whale), Orcinus orca (Killer Whale), Odobenus rosmarus (Walrus), Phocoenoides dalli (Dall's Porpoise), Phocoena phocoena (Harbor Porpoise), Phoca vitulina (Harbor Seal) |
Temporal Coverage
Start Date / End Date | 1999-06-11 / 1999-07-04 |
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Project Data
No Description available
Title | NMML Small Cetacean Aerial Survey 1999 |
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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_117 |
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Collection Identifier | zd_117 |
Parent Collection Identifier | OBIS-SEAMAP |
Additional Metadata
marine, harvested by iOBIS
Purpose | The current study (1997-1999) will provide new abundance estimates for each stock of harbor porpoise and Dall's porpoise. 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. However, a concurrent vessel survey in a selected portion of southeastern Alaska and a calibration study with the survey vessel. We report here the results from the third year of surveys (1999). References: Dahlheim, M., A. York, J. Waite, and C. Goebel-Diaz. 1992. Abundance and distribution of harbor porpoise (Phocoena phocoena) in southeast Alaska, Cook Inlet and Bristol Bay. Annual report to the MMPA Assessment Program, Office of Protected Resources, NMFS, NOAA, 1335 East-West Highway, Silver Spring, MD 20910. Dahlheim, M., A. York, J. Waite, and R. Towell. 1993. Abundance and distribution of harbor porpoise (Phocoena phocoena) in southeast Alaska, Kodiak Island, and the south side of the Alaska Peninsula, 1992. Annual report to the MMPA Assessment Program, Office of Protected Resources, NMFS, NOAA, 1335 East-West Highway, Silver Spring, MD 20910. Dahlheim, M., A. York, J. Waite, and R. Towell. 1994. Abundance and distribution of harbor porpoise (Phocoena phocoena) in southeast Alaska and the offshore waters of Dixon Entrance to Prince William Sound, 1993. Annual report to the MMPA Assessment Program, Office of Protected Resources, NMFS, NOAA, 1335 East-West Highway, Silver Spring, MD 20910. |
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Alternative Identifiers | http://ipt.env.duke.edu/resource?r=zd_117 |