Table 2.

Definitions of acoustic descriptors used in analysis of manatee calf vocalizations.

Measurement	Description
Duration (ms)	Derived by subtracting the start and end time from the selection boundary
Center frequency (Hz)	The frequency that divides the selection into two frequency intervals of equal energy
Bandwidth (Hz)	Difference between the maximum and minimum frequency
Maximum frequency (Hz)	Maximum frequency of the call measured from the power spectrum
Minimum frequency (Hz)	Minimum frequency of the call measured from the power spectrum
Frequency modulation (Hz)	Calculated by subtracting the peak frequency contour min frequency from the peak frequency contour max frequency
Start and end peak frequency (Hz)	Start and end peak frequency obtained from pitch tracking algorithm within the selection boundaries