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ECHOLOCATION RATES OF TWO HARBOR PORPOISES ( PHOCOENA PHOCOENA )
Author(s) -
Akamatsu Tomonari,
Hatakeyama Yoshimi,
Kojima Takahito,
Soeda Hideo
Publication year - 1994
Publication title -
marine mammal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.723
H-Index - 78
eISSN - 1748-7692
pISSN - 0824-0469
DOI - 10.1111/j.1748-7692.1994.tb00497.x
Subject(s) - porpoise , phocoena , human echolocation , biology , enclosure , acoustics , fishery , harbour , physics , telecommunications , engineering , computer science , programming language
A 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.