Abstract:

This paper describes the acoustical behaviours and sound signals of a female Leptonychotes weddellii and its pup in the Fildes Peninsula,Antarctica under different ecologic behaviour. The results obtained by analysing the signals in the laboratory show that their sound signals are mainly composed of a continuous sound signal and a series of pulses. The signal of “ku……” is sounded by the female Leptonychotes weddellii when it was frightened or excited during breast feed. The frequency range is 102Hz-2.3kHz. The spectrum crests in the frequency mainly concentrate on 400Hz and 2kHz respectively. The signal of “mai……” of the pup Leplonychotes weddellii is continuous sound signal when it was separated from its mother. The frequency range is 829Hz-4.4kHz. The spectrum crests in the frequency mainly concentrates on 1.2kHz and 3.5kHz respectively. The signal of “ai……” sounded by the female Leptonychotes weddellii is continuous sound signal in calling its pup,and the frequency range is 486-1190.0Hz. The spectrum crests in the frequency mainly concentrate on 486Hz. The signal of “ai……” sounded by the pup Leptonychotes weddellii is continuous sound signal when it replied to its mother and the frequency range is 614.9-771Hz. The spectrum crest in the frequency mainly concentrates on 663.7Hz. The signal of “jue ke……” was sounded by the female Leptonychotes weddellii in consoling its pup,and the wave shape is of various change characteristics and its frequency range is 466.5Hz-897.9Hz. The spectrum crest in the frequency mainly concentrates on 673.4Hz. The signals of “du er……” sounded by the female Leptonychotes weddellii consist of a series of pulses in which the pulse width is 48ms at the beginning and 11ms at the end. Its interval is 23-28ms,and the frequency range is 861-2098.9Hz. The spectrum crest mainly concentrates on 1.6kHz.