ECHOLOCATION RATES OF TWO HARBOR PORPOISES ( PHOCOENA PHOCOENA )
1994; Wiley; Volume: 10; Issue: 4 Linguagem: Inglês
10.1111/j.1748-7692.1994.tb00497.x
ISSN1748-7692
AutoresTomonari Akamatsu, Yoshimi Hatakeyama, Takahito Kojima, Hideo Soeda,
Tópico(s)Bat Biology and Ecology Studies
ResumoA bstract The rate of occurrence of click trains of two harbor porpoises ( Phocoena phocoena ) were counted during 14 nights. We developed an echolocation signal detection system that was harnessed to a porpoise and activated a light when the animal emitted an echolocation signal. This device, referred to as a click‐light, detects echolocation signals above 150 dB re 1 μPa in the 28–180 kHz range. Echolocation rates, i.e., occurrences of click trains, changed frequently, ranging from 0 to 25 per minute. Echolocation rates were affected by feeding, individual difference, and enclosure type such as the net enclosure and the pool. The porpoise echolocation rates seemed to show acclimation.
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