Echolocation signals of the free-ranging Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientialis)

• DOI: 10.1121/1.1882945
• Publication Date: 2005-05-02T13:34:49Z
• Authors: Songhai Li; Kexiong Wang; Ding Wang; Tomonari Akamatsu
• Keywords: Human echolocation

This paper describes the high-frequency echolocation signals from free-ranging Yangtze finless porpoise in Tian-e-zhou Baiji National Natural Reserve Hubei Province, China. Signal analysis showed that clicks are typical narrow-band (relative width of frequency spectrum Q = 6.6 +/- 1.56, N 548) ultrasonic pulses. The peak frequencies range 87 to 145 kHz with an average 125 6.92 kHz. durations 30 122 micros 68 14.12, as. characteristics similar those other members Phocoenidae as well distantly related delphinids, Cephalorhynchus spp. Comparison these baiji (Lipotes vexillifer), who occupies habitat porpoise, produced by remarkably higher than baiji. Difference between two species is probably linked different size preferred prey fish. Clear double-pulse and multi-pulse reverberation structures noticed, there no indication any low-frequency (< 70 kHz) components during recording period.