@article {57661, title = {Anatomy of the stridulation apparatus of the beech leaf-mining weevil and characterization of, and behavioral responses to, stridulation sounds}, year = {2019}, abstract = {

We investigated auditory signals and morphology of the stridulatory apparatus of the European beech leaf-mining weevil, Orchestes fagi L. (Coleoptera: Curculionidae), an invasive herbivore now established in Nova Scotia, Canada, to determine their potential for enhancing survey tools to monitor the spread of the species in Canada. We recorded and described sounds produced by adult O. fagi, analyzed the morphology of the stridulatory mechanism for intersexual differences and asymmetry, and examined behavioral responses elicited in conspecifics by playback of stridulation recordings. Adult O. fagi produced sounds under three conditions: male in distress, female in distress, and male in the presence of female. Female distress chirps lasted significantly longer than male distress chirps and male chirps in the presence of females, but peak frequencies and mean number of chirps per s did not differ significantly among the three groups. Morphology of the stridulation structures in male and female O. fagi was compared using scanning electron microscopy. Orchestes fagi have an elytro-tergal file- and scraper-type sound production apparatus, through which sound is produced upon anterior motion of the abdomen. Female O. fagi have a \‘pars stridens\’ that is longer and has more ridges than males. Width and number of ridges per length of pars stridens did not differ between the sexes. Evidence of asymmetry was found in male pars stridens, with the right side being longer than the left. Playback of recorded sounds to adult weevils suggests female O. fagi were repelled by sounds produced by distressed males.

}, keywords = {auditory recording, beechweevil, Coleoptera, Curculionidae, distressstridulation, insectbehavior, insectbioacoustics, Orchestes fagi, pars stridens, playback, scanningelectron microscopy, sexual dimorphism}, doi = {10.1111/eea.12844}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/eea.12844}, author = {Goodwin, Joel T.L. and Hillier, N. Kirk and Roscoe, Lucas E. and Sweeney, Jon D.} } @article {57342, title = {Substrate vibrations mediate behavioral responses via femoral chordotonal organs in a cerambycid beetle}, journal = {Zoological Letters}, volume = {2}, year = {2016}, month = {Jan-12-2016}, abstract = {

Background
Vibrational senses are vital for plant-dwelling animals because vibrations transmitted through plants allow them to detect approaching predators or conspecifics. Little is known, however, about how coleopteran insects detect vibrations.

Results
We investigated vibrational responses of the Japanese pine sawyer beetle, Monochamus alternatus, and its putative sense organs. This beetle showed startle responses, stridulation, freezing, and walking in response to vibrations below 1 kHz, indicating that they are able to detect low-frequency vibrations. For the first time in a coleopteran species, we have identified the sense organ involved in the freezing behavior. The femoral chordotonal organ (FCO), located in the mid-femur, contained 60\–70 sensory neurons and was distally attached to the proximal tibia via a cuticular apodeme. Beetles with operated FCOs did not freeze in response to low-frequency vibrations during walking, whereas intact beetles did. These results indicate that the FCO is responsible for detecting low-frequency vibrations and mediating the behavioral responses. We discuss the behavioral significance of vibrational responses and physiological functions of FCOs in M. alternatus.

Conclusions
Our findings revealed that substrate vibrations mediate behavioral responses via femoral chordotonal organs in M. alternatus.

}, keywords = {Behavior, Coleoptera, Sense organ, vibration}, doi = {10.1186/s40851-016-0053-4}, url = {http://zoologicalletters.biomedcentral.com/articles/10.1186/s40851-016-0053-4}, author = {Takanashi, Takuma and Fukaya, Midori and Nakamuta, Kiyoshi and Skals, Niels and Nishino, Hiroshi} }