Abstract
Stridulatory signals are involved in conspecific interactions between bark beetles (Coleoptera: Curculionidae, Scolytinae). In this study, we compared the qualitative profiles of acoustic signals in three species from the genus Polygraphus Er. Sympatry can be periodically observed in two of them –P. proximus and P. subopacus. Sporadically they occur on the same plants. P. nigrielytris colonize distinctly different host plant species; however, on the island of Sakhalin it inhabits the same biotopes. The purpose of the study is to identify species-specific parameters and the extent of differences in stridulatory signals of these species. Airborne signals produced during the contact of males of the same species were experimentally recorded. Among tested parameters of stridulatory signals, as the most species-specific were noted: chirp duration, number of tooth-strikes per chirp, and intertooth-strike interval.
Highlights
For P. proximus and P. subopacus males selected for recording, the accuracy of sexual separation was 100%
For P. nigrielytris, this study indicates the presence of stridulation and the morphological features of the structures involved in the sound production for the first time (Table 1)
The species-specificity of stridulatory signals may be an additional parameter for reproductive isolation of species that occasionally occur on the same tree species
Summary
Airborne sounds and solid-borne vibrations are widely used by animals as communication signals (Dumortier, 1963; Greenfield, 2002; Cocroft & Rodriguez, 2005).According to one of the latest generalized assessments vibrational signals, are used as a communication channel by 92% of all described insect species (Cocroft & Rodriguez, 2005).Numerous studies on this type of communication analyze variability of inter and intra species signals among grasshoppers, crickets, and cicadas (Gerhardt & Huber, 2002; Greenfield, 2002, 2016; Boulard, 2005; Heller, 2005; Henry, 2005; Hoikkala, 2005; Sueur, 2005; Stewart &Sandberg, 2005). According to one of the latest generalized assessments vibrational signals, are used as a communication channel by 92% of all described insect species (Cocroft & Rodriguez, 2005). It is worth taking into account that there are bimodal signals that cause an extremely weak response from the recipient during the broadcast separately of airborne component of signal or substrate borne vibration. They may have a high synergistic effect during reception in complicity
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