"We know for sure that this myoelastic mechanism is working, and it clears things up for future research on the structure of calls," she says.
Bats where place into two groups according to the structure of calls: FM bats (Mops condylurus, Chaerephon major, Mops niveiventer) and FM/QCF bats (Scotophilus dinganii and Scotophilus leucogaster).
Whether the acoustic structure of calls is related to female cycle stage was not investigated.
The temporal structure of calls was also affected by mate guarding (Table 4, Fig. 5b).
In this case, do quality-related changes to the acoustic structure of calls induce a modification of vocal cues to identity from year to year?
Our results show that the timing of the fertile phase is not encoded in either the temporal or in the spectral structure of calls.
Thirdly, socially affiliated individuals may converge in the acoustic structure of calls they produced, a patterns seen in typical vocal learners, such as songbirds, bats, or cetaceans.
However, inasmuch as calls here serve as an indicator of the MRS, it is insufficient to show variation in structure of calls; rather this variation must also have some bearing on mate choice.
When identity and quality cues are not conveyed in different and independent components of the vocalisations, quality-related changes to the acoustic structure of calls may induce modifications of the vocal cues to identity.
The spectral structure of calls was investigated using spectrograms (fast Fourier transform (FFT) method; window length, 0.01; time step, 1,000; frequency step, 500; Gaussian window; and dynamic range, 50 dB).
