SPL (in dB) of acoustic signals in Chinese alligator social communication. Long-distance signal (bellowing) had a higher SPL than short-distance signals (tooting, hissing, mooing and whining). Head slapping and bubble blowing were omitted here because they are produced by slapping or blowing water. (Mann-Whitney -Test, , , two-tailed). Numbers above bars indicate sample sizes.
Posture of the bellowing activity of the Chinese alligator, with a head oblique tail arched posture.
(Color online) Wave form and spectrogram of the long-distance signal—bellowing. (a) Wave form of a bout with three bellows; (b) and (c) show the wave form and spectrogram of the second bellow of the bout, respectively.
(Color online) Wave form (1) and spectrogram (2) of the short-distance signals. Panels (a), (b), (c) and (d) show wave forms and spectrograms of tooting, hissing, mooing, and whining, respectively (head slapping and bubble blowing were omitted here because they are produced by slapping or blowing water).
Temporal and frequency features of acoustic signals in Chinese alligator social communication.
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