AN ANALYSIS OF ADVERTISEMENT SONGS OF Hyalessa maculaticollis (HEMIPTERA: CICADIDAE)

DOI: 10.18173/2354-1059.2023-0067

Tóm tắt

Advertisement songs play the critical role of a prezygotic reproductive isolation mechanism. Specifically, female cicadas rely on the fluctuation of spectral and temporal properties of males’ songs for species recognition and pair formation. However, the structure of the advertisement song is often arbitrarily determined without proper delimitation criteria. Here, a new method for analyzing song structure was proposed which relied on fluctuation of spectral properties. First, time series of peak frequency and amplitude envelope were obtained from recorded songs. Then, a simple linear regression model based on those two time-series was tested for consistency of regression coefficients. This method was applied in analyzing advertisement songs of Hyalessa maculaticollis, a common cicada species whose advertisement songs contain multiple modulations in spectral properties in East Asia. Males of H. maculaticollis produced songs in separate phrases in which one phrase was equivalent to one complete song and they also changed their calling perches from tree to tree in between songs. One phrase of H. maculaticollis was divided into four main parts, in which the first two parts were repeated alternatively and the last two were produced once at the end. The proposed method suggests an effective objective way of analyzing acoustic characteristics of songs, especially for those animals with complex structures.