Data Acquisition And Analysis System Of Insect Acoustic Signal And Its Application In Acoustic Communication Of Nilaparvata Lugens (Stal)

A data acquisition and analysis system of insect acoustic signal (DAASIAS)with friendly interface, simple operation and multifunction was developed. It could sample and analyze insect acoustic signals in real time. By DAASIAS both observing insect behavior and analyzing signal could be conducted at the same time. DAASIAS was applied firstly in sampling and analyzing the brown planthopper Nilaparvata lugens (St l) signals. The results showed that DAASIAS was steady and provided a powerful platform for deeply studying insect sound communication.Female and male of the brown planthopper could respond each other by courtship signal after hearing heterosexual courtship signals. Male could distinguish female direction by signal and look for her actively. Finally they mated. Male courtship signal could make male compete. The second male vibration signal (SMVS) could not only stimulate female and male to give their love sound, but also gave rise to male unease and competition. Male giving SMVS was more competitive. SMVS was often heard when many males congregated together.Female courtship signal of the brown planthopper was made of many continuous regular pulses and male's signal was made of similar syllabics and had two types with different time domain characteristics. Second male vibrational signal differed from male courtship signal with wide spectrum range and regular syllabics frequency.Time domain characteristics of signals in different individuals even the same individual were different. But frequency domain characters included pulse repetition frequency and main vibration frequency were stable. Pulse repetition frequency of middle section of male courtship signal declined from start to end, the average declining range was 4.0 Hz.Through cutting and combining to courtship signals, we found sensitive acoustic section to female was the middle part of male courtship signal and to male was female courtship signal. Synthesized signals with different pulse repetition frequencies (PRF) and main vibration frequencies (MVF) were presented to the brown planthopper. The results showed that PRF was a sensitive and important signal characteristic in mating choice. The PRF and MVF sensitive ranges of male signals were 70~90Hz, 200~1700Hz separately, and of female signals were about 22Hz, 100~300Hz separately.