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Echolocation rates of two harbor porpoises (Phocoena phocoena)
Akamatsu, T.; Hatakeyama, Y.; Kojima, T.; Soeda, H. (1994). Echolocation rates of two harbor porpoises (Phocoena phocoena). Mar. Mamm. Sci. 10(4): 401-411. hdl.handle.net/10.1111/j.1748-7692.1994.tb00497.x
In: Marine Mammal Science. Society for Marine Mammalogy: Lawrence, Kan.. ISSN 0824-0469, more
Peer reviewed article  

Available in Authors 

Keywords
    Phocoena phocoena (Linnaeus, 1758) [WoRMS]; Marine

Authors  Top 
  • Akamatsu, T.
  • Hatakeyama, Y.
  • Kojima, T.
  • Soeda, H.

Abstract
    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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