Echolocation rates of two harbor porpoises (Phocoena phocoena)
In: Marine Mammal Science. Society for Marine Mammalogy: Lawrence. ISSN 0824-0469; e-ISSN 1748-7692, more
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| Keywords |
Phocoena phocoena (Linnaeus, 1758) [WoRMS]
Marine/Coastal |
| Authors | | Top |
- Akamatsu, T.
- Hatakeyama, Y.
- Kojima, T.
- Soeda, H.
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| 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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