Table 1. Descriptions of acoustic properties measured.

Properties of calls
Call duration (ms)	Time between onset of first pulse and offset of last pulse in a call
Call rise time (ms)	Time between onset of first pulse and pulse of maximum amplitude
Call fall time (ms)	Time between pulse of maximum amplitude and offset of last pulse
50% Call rise time (ms)	Time between call onset and the half-amplitude point of earliest maximum peak in the call waveform
50% Call fall time (ms)	Time between the half-amplitude point of the last maximum peak in the call waveform and pulse offset
Pulses per call	Count of pulses (k)
Pulse rate (pulses/s)	(k– 1)/t, where t is the time between onset of first pulse and onset of last pulse
Dominant frequency (kHz)	Maximum frequency using Raven’s selection spectrum function over the duration of the entire call