Preliminary Hearing Study on Gray Whales (Eschrichtius Robustus) in the Field
Hearing capabilities of several odontocetes have been investigated through behavioral response techniques (Johnson, 1967; Anderson, 1970; Hall and Johnson, 1971; Jacobs and Hall, 1972; Ljungblad et al., 1982; Thomas et al., 1988), cortical evoked potential techniques (Seeley et al., 1976), and electrophysiological methods (Bullock et al., 1968; Ridgway et al., 1981). Past studies have been limited to toothed whales and dolphins held in captivity. Because of their large size, it is unlikely that mysticete whales will be kept in captivity for long-term behavioral studies. Similarly, it also is unlikely that a baleen whale could be restrained temporarily for a physiological hearing test. Alternative, non-invasive techniques will be necessary to test hearing in baleen whales. Hearing data on baleen whales are important to judge potential impacts from underwater man-made noise on these animals.
KeywordsAmbient Noise None None Killer Whale Dive Duration Gray Whale
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