Kerchev Ivan A
Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of Russian Academy of Sciences, Tomsk, Russia.
Environ Entomol. 2019 Feb 13;48(1):181-188. doi: 10.1093/ee/nvy178.
Invasion of Polygraphus proximus (Blandford) has caused an extensive destruction in the aboriginal forest ecosystems of South Siberia. The goal of this study was to better understand the acoustic communication of P. proximus by analyzing the beetles' sound-production mechanisms and comparing sounds produced during different behaviors. Comparisons applied waveform analysis and quantitation of temporal parameters such as syllable, chirp duration, interchirp interval, number of tooth-strike per chirp, strike rate, and the duration of intervals between strikes. We recorded the acoustic signals of the bark beetle in three behavioral contexts: stress (handling), rivalry (male-male interactions), and courtship (male-female interactions). Acoustic signals produced during stress, rivalry behavior, and courtship chirps have very similar waveforms but are distinguishable according to temporal parameters (e.g., number of strikes in chirps and duration of intervals between them). During courtship, males produce two types of chirps. The first type was produced in all three contexts. The second chirp type was registered only in male-female interactions just before copulation. Precopulation signals produced by rubbing of the tibia against the elytral margin were registered for the first time in a bark beetle. The role of the precopulation signal was the clearest. The established modulations of signals in stress trials in comparison with the similar courtship and rivalry chirps are apparently due to effects of insect body movement against restraint. We hypothesize that the chirp temporal parameters in courtship and rivalry may be used by the sender to reveal his presence or physical characteristics to a receiver (female or rival male).
西伯利亚近距多纹象（Blandford）的入侵对南西伯利亚的原始森林生态系统造成了广泛破坏。本研究的目的是通过分析该甲虫的发声机制并比较不同行为期间产生的声音，更好地了解西伯利亚近距多纹象的声学通讯。比较采用了波形分析以及对音节、啁啾持续时间、啁啾间隔、每次啁啾的敲击齿数、敲击率和敲击间隔持续时间等时间参数的定量分析。我们在三种行为情境下记录了树皮甲虫的声学信号：应激（处理）、竞争（雄-雄互动）和求偶（雄-雌互动）。在应激、竞争行为和求偶啁啾期间产生的声学信号具有非常相似的波形，但根据时间参数（例如，啁啾中的敲击次数及其间隔持续时间）是可区分的。在求偶期间，雄性产生两种类型的啁啾。第一种类型在所有三种情境下都会产生。第二种啁啾类型仅在交配前的雄-雌互动中记录到。通过胫骨与鞘翅边缘摩擦产生的交配前信号首次在一种树皮甲虫中记录到。交配前信号的作用最为明显。与类似的求偶和竞争啁啾相比，在应激试验中确定的信号调制显然是由于昆虫身体在受限情况下运动的影响。我们假设求偶和竞争中的啁啾时间参数可能被发送者用来向接收者（雌性或竞争雄性）揭示其存在或身体特征。
