Exact(5)
Males only vocalise during the breeding season and the sexually selected call they produce is known as a groan [32], [33].
Using the analysis tool in SonoBat, we manually placed the cursors on the time-frequency sonogram of the selected call to determine minimum, maximum, maximum energy frequencies, and pulse duration.
Firstly, we compared selected call parameters with female oestrogen to progestogen levels in order to identify the relationship between call structure and female hormonal status.
Specifically, we correlated selected call parameters with the female oestrogen to progestogen ratio (obtained from faecal samples), which are known to be elevated during the female's fertile phase.
The regular DFA that included 163 calls (one randomly selected call per bout) indicated that 55.7% of calls were correctly classified to their eliciting context (cross-validated: 44.2%), significantly better than the chance value of 33% (binomial test of cross-validated classification: P = 0.003, N = 163).
Similar(55)
Using a sub-sample of 23 nestlings for which we randomly selected calls we confirmed that our call selection lead to similar estimation of call parameters (see additional file 4).
In the second phase, additional sensors are selected, called connectors.
On the software plugins also, the bright channel was selected (called "Brilliant" on the ReValver AC30), all tone controls were set to 12 o'clock, and different recordings were made while varying the channel gain.
In 2007, "Alternative D" for the reconstructed interchange was selected, calling for I-295 to cross over the north south Freeway.
Models of honest advertisement predict that sexually selected calls should signal male quality.
The acoustic structure of sexually selected calls often contains information on different phenotypic traits of the caller that is potentially available to other individuals [4], [16], [24], [43].
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