Reactions of Hector's dolphins to acoustic gillnet pingers

Authors: 

Stone, G.S., Cavagnaro, L., Hutt, A., Kraus, S., Baldwin, K., Brown, J.

Year: 

2000

Journal/Publisher Name: 

Department of Conservation, New Zealand

Publisher Address: 

PO Box 10-420 Wellington, New Zealand

Page #s: 

28
Summary: 

White Dukane pingers with a fundamental frequency of 10kHz and harmonies of up to 160 kHz, elicited the strongest response from Hector's dolphins, compared to the black Pice and red Dukane pingers. More than half (62.5%) of the dolphins exhibited avoidance when exposed to the white pinger. However, no significant differences between pingers were found in the rate of echolocation clicks per dolphin or dolphin group, or among the peak frequencies of subset clicks.