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Movements and Spatial Use of Odontocetes in the western Main Hawaiian Islands: Results of a Three-year Study off O‘ahu and Kaua‘i

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Author
Baird, Robin W.
Webster, Daniel L.
Mahaffy, Sabre D.
Schorr, Gregory S.
Aschettino, Jessica M.
Gorgone, Antoinette M.
Date
2013-11-08
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Abstract
A long-term assessment of odontocete populations throughout the main Hawaiian Islands has involved small-boat surveys using photo-identification, genetic sampling and satellite tagging, to address questions related to population structure and habitat use, among others. Prior to 2010 we had undertaken limited field operations off O‘ahu (in 2002 and 2003), and off of Kaua‘i (in 2003, 2005 and 2008). Navy training activities may take place throughout the Hawai‘i Range Complex, however many of the training exercises are undertaken in the western main Hawaiian Islands, in particular at the Pacific Missile Range Facility (PMRF) off Kaua‘i and Ni‘ihau. As part of an effort to reduce uncertainty regarding the population structure, range, and abundance of odontocetes in the western main Hawaiian Islands, to help inform Navy impact assessments, we undertook small-boat based research efforts off O‘ahu (in 2010) and off Kaua‘i (in 2011 and 2012). These efforts utilized a variety of field methods to obtain data sets relevant to assessing these population characteristics, including photo-identification, collection of biopsy samples for genetic studies, and satellite tagging. Over the three years of the project surveys were undertaken on 66 days (406 hours), covering 6,559 km. Overall there were 191 odontocete sightings, 183 of which were identified to species. Off O‘ahu there were 30 sightings of 10 species, while off Kaua‘i and Ni‘ihau there were 153 sightings of eight species. One hundred and two biopsy samples were collected from seven different species for genetics and toxicology studies. Thirty satellite tags were deployed on five species: pygmy killer whales, false killer whales, bottlenose dolphins, rough-toothed dolphins, and short-finned pilot whales. For all five species, tag data indicate that there are island-associated populations. Our efforts substantially increased what is known about the movements and habitat use of these five species of odontocetes in the western main Hawaiian Islands
Description
Final report under Grant No. N00244-10-1-0048 from the Naval Postgraduate School
URI
http://hdl.handle.net/10945/62054
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Related items

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    Movements and spatial use of odontocetes in the western main Hawaiian Islands: results from satellite-tagging and photo-identification off Kaua‘i and Ni‘ihau in July/August 2011 

    Baird, Robert W.; Webster, Daniel L.; Schorr, Gregory S.; Aschettino, Jessica M.; Gorgone, Antoinette, M.; Mahaffey, Sabre D. (2012);
    Although considerable information is available on residency patterns and spatial use of odontocetes in the eastern half of the Hawai‘i Range Complex (HRC), much less is known about odontocetes in the western half of the ...
  • Thumbnail

    Movement and spatial use of Odontocetes in the western main Hawaiian Islands: results of a three-year study off O'ahu and Kaua'i 

    Baird, Robin W.; Webster, Daniel L.; Mahaffy, Sabre D.; Schorr, Gregory S.; Aschettino, Jessica M; Gorgone, Antoinette M. (Monterey, California, Naval Postgraduate School, 2013-11); NPS-OC-14-001CR
    Understanding the impacts of anthropogenic activities on animal populations requires knowledge of their population structure, sizes and ranges. In Hawaiian waters this type of basic information has been lacking or is ...
  • Thumbnail

    Movements and Spatial Use of Odontocetes in the Western Main Hawaiian Islands: Results from Satellite-Tagging and Photo-Identification off Kaua'i and Ni'ihau in July/August 2011. 

    Baird, Robin W.; Webster, Daniel L.; Aschettino, Jessica M.; Schorr, Gregory; Mahaffy, Sabre D.; Gorgone, Antoinette M. (Monterey, California. Naval Postgraduate SchoolDepartment of Oceanography, 2012-09); NPS-OC-12-003CR
    This report summarizes the second year of a three-year effort in the western main Hawaiian Islands to study the residency patterns and spatial use of odontocetes in the Hawaii Range Complex. Surveys were made off Kaua‘i ...
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