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Creator:: Au, Whitlow W. L., Branstetter, Brian K., Benoit-Bird, Kelly, and Kastelein, Ronald A.
Abstract:: The biosonar system of dolphins and porpoises has been studied for about 5 decades and much has been learned [Au,W.W. L. )1993). The Sonar of Dolphins (Springer, New York)]. Most experiments have involved human-made targets; little is known about odontocetes’ echolocation of prey. To address this issue, acoustic backscatter from...
Resource Type:: Article
Full Text:: Institute of Marine Biology, University of Hawaii, P.O. Box 1106, Kailua, Hawaii 96734 Brian K. Branstetter

Creator:: Benoit-Bird, Kelly J., Au, Whitlow W. L., and Kastelein, Ronald A.
Abstract:: The hypothesis that sounds produced by odontocetes can debilitate fish was examined. The effects of simulated odontocete pulsed signals on three species of fish commonly preyed on by odontocetes were examined, exposing three individuals of each species as well as groups of four fish to a high-frequency click of a...
Resource Type:: Article
Full Text:: of each signal using a calibrated B&K 8103 hydrophone placed at a variety of ranges from the transmit

Creator:: Au, Whitlow W. L., Benoit-Bird, Kelly J., and Kastelein, Ronald A.
Abstract:: The target strength as a function of aspect angle were measured for four species of fish using dolphin-like and porpoise-like echolocation signals. The polar diagram of target strength values measured from an energy flux density perspective showed considerably less fluctuation with azimuth than would a pure tone pulse. Using detection...
Resource Type:: Article
Full Text:: station were made available thanks to Dick Vethaak �RIKZ�, Roeland Al- lewijn �RIKZ�, and Wanda Zevenboom

Creator:: Au, Whitlow W. L., Kastelein, Ronald A., Benoit-Bird, Kelly J., Cranford, Ted W., and McKenna, Megan F.
Abstract:: An experiment was conducted to investigate the sound pressure patterns on the melon of odontocetes by using four broadband hydrophones embedded in suction cups to measure echolocation signals on the surface of the forehead of two harbor porpoises (Phocoena phocoena). It has long been hypothesized that the special lipids found...
Resource Type:: Article
Full Text:: signal received by the reference hydrophone as s2(k) and the digitized signal of another hydrophone as si

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