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dc.contributor.advisor Au, Whitlow en_US Lammers, Marc O. en_US 2008-10-24T23:59:11Z 2008-10-24T23:59:11Z 2003 en_US
dc.identifier en_US
dc.description Thesis (Ph. D.)--University of Hawaii at Manoa, 2003. en_US
dc.description Mode of access: World Wide Web. en_US
dc.description Includes bibliographical references. en_US
dc.description Electronic reproduction. en_US
dc.description Also available by subscription via World Wide Web en_US
dc.description xvii, 187 leaves, bound ill. 29 cm en_US
dc.description.abstract This dissertation explores the design of dolphin social acoustic signals by addressing the question: how have the signals used by these animals been adapted to the physical, sensory and social environments they inhabit? To obtain answers to this question, the behavior and acoustic signals of spinner dolphins (Stenella longirostris) and spotted dolphins (Stenella frontalis) were examined. A rhythmic pattern of behavior is described for a population of spinner dolphins resident off the island of O'ahu. The population is tied to both trophic and physiographical resources associated with the island's coastline, where groups fuse and fragment in predicable patterns over the course of a daily cycle of activity and rest. Acoustic signals are thought to playa critical role in the coordination of animals within and between groups. A broadband analysis of the whistles and burst pulses of these two species reveals that they span a much broader range of frequencies than typically discussed in the literature. A considerable amount of energy is found in the higher frequency harmonics of whistles, as well as in the ultrasonic bands of burst pulses. Many burst pulses in fact have energy exclusively at ultrasonic frequencies and are thus inaudible to human hearing. Most if not all of the frequency hearing sensitivity typical for dolphins appears to be exploited in the design of their social acoustic signals. Evidence is also presented on the directionality of whistles together with a discussion on how the directional transmission of harmonics may provide important cues to listening animals about the orientation and direction of movement of a signaler. The "mixed-directionality" of dolphin whistles is proposed as a signal design feature that may be very important for the coordination of individuals within groups. Finally, a discussion is presented on how these findings fit together to provide a more complete picture of the nature of dolphin social acoustic signals. Their functional design is considered along with the features that make them well suited for echolocation and communication underwater. A roadmap is provided for future investigators who wish to further explore the design of dolphin social acoustic signals. en_US
dc.format electronic resource en_US
dc.language.iso en-US en_US
dc.publisher University of Hawaii at Manoa en_US
dc.relation Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Zoology (Ecology, Evolution and Conservation Biology); no. 4298 en_US
dc.rights All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner. en_US
dc.rights.uri en_US
dc.title The behavior and broadband acoustic signaling of Hawaiʻian spinner dolphins (Stenella longirostris) en_US
dc.type Thesis en_US
dc.type.dcmi Text en_US
dc.contributor.department Zoology en_US 2003-05 en_US
local.identifier.callnumber AC1 .H3 no. 4298 en_US
local.thesis.degreelevel PhD en_US

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