{"refrec":{"BRefID":260942,"RR":"<b>Akamatsu, T.; Hatakeyama, Y.; Kojima, T.; Soeda, H.</b> (1994). Echolocation rates of two harbor porpoises (<i>Phocoena phocoena</i>). <i>Mar. Mamm. Sci. 10(4)</i>: 401-411. <a href=\"http://dx.doi.org/10.1111/j.1748-7692.1994.tb00497.x\" target=\"_blank\">http://dx.doi.org/10.1111/j.1748-7692.1994.tb00497.x</a>","BEntID":252960,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Mar. Mamm. Sci. 10(4)</i>: 401-411. <a href=\"http://dx.doi.org/10.1111/j.1748-7692.1994.tb00497.x\" target=\"_blank\">http://dx.doi.org/10.1111/j.1748-7692.1994.tb00497.x</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Akamatsu, T.; Hatakeyama, Y.; Kojima, T.; Soeda, H.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Akamatsu, T. <i>et al.</i>","Englishabstract":"The rate of occurrence of click trains of two harbor porpoises (<i>Phocoena phocoena</i>) 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. 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