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Visual and genetic surveys for odontocete cetaceans in American Samoa 2003-06
Johnston, D.W., J. Robbins, M.E. Chapla, D.K. Mattila, and K.R. Andrews. 2008. Diversity, habitat associations and stock structure of odontocete cetaceans in the waters of American Samoa, 2003-2006. Journal of Cetacean Research and Management. 10:59-66
Contact: Chapla, Marie

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Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Data of photo-identification and biopsy surveys of odontocete cetaceans inhabiting waters of American Samoa. more

Very little is known about the species composition, distribution, abundance, and stock structure of odontocete cetaceans inhabiting the United States Exclusive Economic Zone's (EEZ) waters of American Samoa. While some information on species presence in this region has been gleaned from anecdotal sightings and whaling and stranding records, the diversity of odontocete cetaceans in the waters of American Samoa has never been formally investigated. We conducted a series of small boat photo-identification and biopsy surveys for cetaceans in the nearshore waters of Tutuila during 2003-2006. As well, ship-based visual surveys were conducted in the waters surrounding the Manu'a Islands, Rose Atoll, and Swains Island in the summer of 2006. A total of 52 groups of odontocete cetaceans were encountered during small boat surveys, including spinner dolphins (Stenella longirostris), rough-toothed dolphins (Steno bredanensis), sperm whales (Physeter macrocephalus), false killer whales (Pseudorca crassidens), bottlenose dolphins (Tursiops sp.), dwarf sperm whales (Kogia sima), and unidentified odontocetes. A total of six groups of cetaceans were encountered during ship-based surveys, including false killer whales, pilot whales (Globicephala macrorhynchus), sperm whales, and unidentified odontocetes. Photographs, taken during both small boat and ship-based surveys, were analyzed for quality, and individuals with distinctive markings were selected for entry into the photo-identification catalogue. The resulting catalog includes 46 spinner dolphins, 41 rough-toothed dolphins, 2 bottlenose dolphins, 5 false killer whales, 4 pilot whales, 1 dwarf sperm whale, and 4 sperm whales. Thirteen (13) spinner dolphins and 14 rough-toothed dolphins were sighted in multiple years. For spinner dolphins, genetic data were used to estimate genetic diversity and effective population size and to compare these values with those of spinner dolphins in the Hawaiian Islands. Diversity and populations size estimates were higher in American Samoa than in Hawai'i, suggesting a larger population size at American Samoa. Dataset credit = Pacific Islands Fisheries Science Center & Hawaiian Islands Humpback Whale National Marine Sanctuary

Biology > Mammals
Marine, I, Pacific, Globicephala Lesson, 1828, Megaptera novaeangliae, Physeter macrocephalus Linnaeus, 1758, Pseudorca crassidens, Stenella Gray, 1866, Steno bredanensis, Tursiops Gervais, 1855

Geographical coverage
I, Pacific [Marine Regions]

Temporal coverage
18 September 2003 - 11 October 2006

Taxonomic coverage
Globicephala Lesson, 1828 [WoRMS]
Megaptera novaeangliae (Borowski, 1781) [WoRMS]
Physeter macrocephalus Linnaeus, 1758 [WoRMS]
Pseudorca crassidens (Owen, 1846) [WoRMS]
Stenella Gray, 1866 [WoRMS]
Steno bredanensis (G. Cuvier in Lesson, 1828) [WoRMS]
Tursiops Gervais, 1855 [WoRMS]

Federal Government of the United States of America; Department of Commerce; National Oceanic and Atmospheric Administration; National Marine Fisheries Service; Pacific Islands Fisheries Science Center (PIFSC), moredata owner

Related datasets
Published in:
OBIS-SEAMAP: Spatial Ecological Analysis of Megavertebrate Populations, more

Based on this dataset:
Johnston, D.W. et al. (2008). Diversity, habitat associations and stock structure of odontocete cetaceans in the waters of American Samoa, 2003-06. J. Cetacean Res. Manage. 10(1): 59-66, more


Dataset information:

Dataset status: Completed
Data type: Data
Data origin: Research: field survey
Metadatarecord created: 2012-11-28
Information last updated: 2012-11-28
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