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Fig. 3. Cycle-to-cycle frequencies (fC) of single sound pulses
for representative S. borellii and S. vicinus at 25° C.
The fC is not constant and decreases by 5–10% late
in the call (especially so in this S. vicinus individual). The
instantaneous jumps in frequency late in the pulses (asterisks) are believed
to be associated with the disengagement of file and plectrum. This is followed
by a period of undriven vibration, during which the sound amplitude drops
exponentially. Although the patterns given in this figure are typical, a
number of individuals of both species showed different degrees of
fC stability and sometimes lacked a noticeable change in
frequency at the start of the sound amplitude's exponential decay.
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