Isolamento reprodutivo em duas espécies simpátricas de Chinavia Orian (Hemiptera: Pentatomidae) : importância da comunicação vibracional e composição química da cutícula

Though little known, the issue of vibratory signals through substrates is a common form of communication in insects. Many of these signs are specific and facilitate the partner's location, recognition and mating. As in other pentatomids, reproductive stages of Chinavia ubica (Rolston, 1983) e Chinavia impicticornis (Stål, 1872) consist of pheromone emission over long distances, and vibrational signals and touch the antennas (antennation) over short distances. This study was directed to determining whether differences in the temporal characteristics of the vibrational signals of both species induce variation in the response of individuals to establish the specificity of vibrational communication is related to the temporal composition of vibratory signals. Additionally study up the cuticle of the chemical composition of these two species to establish whether the specific differences within and between the sexes that may suggest use of these compounds for recognition and discrimination among individuals in cutting phase of reproductive behavior. It was found that alteration of temporal parameters of the vibratory signals of females of both species in relation to the natural decreasing the response signals of conspecific males, support the hypothesis that the recognition and discrimination of vibration signals are related to specific temporal parameters species. Both species have similar profiles cuticular hydrocarbons with differences between species and sex suggesting its possible role as chemical signals used during cutting behavior. These results show that reproductive isolation of simpatric Chinavia species studied is a result of a multimodal signaling system which includes addition of sex pheromones, previously identified, vibrational signals and non-volatile chemical signals (cuticular hydrocarbons).