2019 年 70 巻 4 号 p. 221-234
The attractiveness of frog sounds to biting Uranotaenia mosquitoes and Corethrella midges was determined using natural and synthesized sounds. The traps with each species’ call of eight frog species or a series of them, were set in a forest of Iriomote Island. Out of 17 mosquito species collected, Uranotaenia macfarlanei Edwards was the predominant species. Most Ur. macfarlanei females were collected by characteristic calls which had dominant frequency of about 1,000 Hz. We synthesized 23 sounds which varied in frequency spectrum (original burst, sinusoidal, and noise), wave form, repeated rhythm, and loudness of sounds. The burst sound was synthesized by editing the original scream of male Fejervarya sakishimensis Matsui et al., which had two dominant frequencies of 1,038 Hz and 2,312 Hz. The sinusoidal sound had a dominant frequency of 1,000 Hz, while the noise sound had no dominant frequency. Uranotaenia macfarlanei females were collected with the original burst and sinusoidal sounds more than noise sound. They were also well attracted when loudness was higher than about 75 dB SPL. The original burst sound also attracted Corethrella nippon Miyagi more than sinusoidal and noise sounds. Prediction model indicated that low loudness sounds still attracted C. nippon compared to Ur. macfarlanei.
