Contour variations and acoustic characteristics of whistle sounds emitted by Pacific white-sided dolphins in shallow coastal waters of the Sea of Japan

We aimed to clarify the acoustic characteristics and repertoire of the whistle of Pacific white-sided dolphins (PWSDs). Although complex multiloop whistles were not recorded, whistle contours were classified into seven types. Considering the extremely low whistle vocalization rates, dolphins may choose whistles instead of pulsed sounds in limited contexts.

Marine Mammal Science