02181nas a2200217   4500008004100000245016400041210006900205520132700274653001701601653001701618653004001635653002001675653001801695653001301713100001701726700002001743700001901763700002101782700002401803856013601827       2020                        eng d00aDung beetle distress signals may be correlated with sex and male morph: a case study on <i>Copris lunaris</i>               (Coleoptera: Scarabaeidae, Coprini)0 aDung beetle distress signals may be correlated with sex and male3 a<p>Insect sounds are predominantly produced by stridulations, where specialised body parts contact repeatedly to induce acoustic pulse trains. We studied the stridulatory organ and sound emissions in Copris lunaris, by focussing separately on females, and on major and minor males. Results highlighted an isometric growth of pars stridens in response to body size, and identified a wing-pygidium locking structure that assists sound emission. Sex-specific acoustic differences of some degree were detected between major males and females, as sounds emitted by majors showed higher frequencies and shorter pulses with elevated impulse rates. This cannot be immediately explained by size differences in the components of stridulatory apparatus. Rather, divergence might be an indicator of some underlying behavioural difference in response to distressing events. In minor males, acoustic properties overlapped with both females and major males, although incomplete stridulations had a lower ratio in minor than major males. This paper provides the very first perspective of the potential role of sex and male polymorphism on sound production. However, future categorisations of sounds coupled to behavioural observations of specific interactions are needed to reveal the function of sex and morph-specific differences.</p>
10abioacoustics10adung beetles10aelytro-abdominal stridulatory organ10amale dimorphism10apars stridens10aplectrum1 aKerman, Kaan1 aRoggero, Angela1 aPiccini, Irene1 aRolando, Antonio1 aPalestrini, Claudia  uhttps://www.tandfonline.com/doi/full/10.1080/09524622.2019.1710255https://www.tandfonline.com/doi/pdf/10.1080/09524622.2019.171025502500nas a2200157   4500008004100000022001400041245012700055210006900182260001600251490000700267520188300274100002202157700002402179700002102203856011802224       2004                        eng d  a1438-389600aStridulation variability and morphology: an examination in dung beetles of the genus Trypocopris (Coleoptera, Geotrupidae)0 aStridulation variability and morphology an examination in dung b  cJan-04-20040 v463 aDistress signals produced by dung beetles of the genus Trypocopris (Coleoptera, Geotrupidae) were analysed to test whether interspecific and intraspecific acoustic variability are species- and subspecies-specific and to ascertain to what extent bioacoustic parameters depend upon the morphology of the stridulatory organs (pars stridens). Bioacoustic analyses showed that the three species were clearly differentiated, despite the fact that disturbance stridulations presented the same stereotyped spectrographic pattern. Within each species, most of the subspecies and populations considered were also bioacoustically distinguishable. Subspecies and populations within each species were differentiated with regard to body size and stridulatory organ, and the length of the pars stridens was positively correlated with the width of the coxa, in turn positively correlated with body size. A few spectrographic measures were significantly constrained by the morphology of the stridulatory apparatus; in particular the duration of sound emission was positively correlated with the length of the apparatus and the sub-pulse rate was negatively related to the distance between two consecutive crests. For T. pyrenaeus, with the largest number of populations sampled, there was no significant correlation between morphological and spectrographic distances, but there were significant positive correlations between morphological and geographical distances and between morphological and genetic distances. It is hypothesized that genetic differentiation might directly affect variability of the stridulatory apparata which would also be indirectly influenced and constrained by external morphological traits (like the width of the coxa and body size). Stridulatory organs, in turn, would affect the ways a few stridulatory traits (especially the temporal ones) change in time and space.1 aCarisio, Loredana1 aPalestrini, Claudia1 aRolando, Antonio  uhttp://link.springer.com/10.1007/s10144-004-0170-3http://www.springerlink.com/index/pdf/10.1007/s10144-004-0170-3