The relationship between echolocation frequency (represented by dominant frequency, DF for short) and body size (body mass, forearm length and body length) in 8 species of horseshoe bats ( Rhinolophus cornutus, R. aff...The relationship between echolocation frequency (represented by dominant frequency, DF for short) and body size (body mass, forearm length and body length) in 8 species of horseshoe bats ( Rhinolophus cornutus, R. affinis, R. thomasi, R. rouxi, R. blythii, R. ferrumequinum, R. pearsoni, R. rex ) was examined. The eight species were captured in caves in five regions (Guiyang, Anlong, Xingyi, Anshun and Zhenning) of Guizhou Province in July and August 1999 and June 2000. The species were identified based on the descriptions in Mammals of GuiZhou (Luo et al .)and Key to the Identification of Chiroptera (Wang, unpublished). The bats were captured at the entrance to the caves at about 8 pm (the time when bats usually leave the caves), and were then put into a recording room near the capture locations where they could fly freely. Recordings of their echolocation calls were made bout 2 hours later using an ultra sound detector (U30, Ultra Sound Advice, UK) which recorded the calls of bats that were flying directly at the microphone at a distance of 1 m. Each bat was recorded 5 times and the signals were fed into a portable ultra sound processor (PUSP, Ultra Sound Advice, UK). The duration for recording was 1 1 s with a sampling frequency of 44 1 kHz. By replaying the recorded tapes the best quality recordings (the loudest and clearest with the least background noise) were replayed at 1/10 speed and re recorded using a digital sound recorder (Sony, MD 1, frequency response range: 30～20 000 Hz). The re recorded echolocation signals were analyzed using the sound processing software Cool Edit 2000, developed by the American Syntrillium Software Company. Ultra sound analysis referred to the sound spectrograms (frequency time graph), time domain spectrograms (energy time graph), energy spectrograms (energy frequency graph), and Hanning window to obtain an analytic precision of 256 Hz. The analysis attenuation was 60 dB. The DF, pulse duration and interpulse interval of the echolocation calls were recorded and the duty cycle展开更多
Echolocation calls of Myotis frater emitted during the search phase consist of brief frequency-modulated pulses. The sound signals are comprised of three harmonics of which the first one is of the highest intensity an...Echolocation calls of Myotis frater emitted during the search phase consist of brief frequency-modulated pulses. The sound signals are comprised of three harmonics of which the first one is of the highest intensity and occurs in all echolocation calls. The frequency of this fundamental harmonic ranges from 110.8 to 50.2 kHz, and its duration is about 3.5 ms. The second and the third harmonics are relatively weak, occurring in 50.0% and 25.0% of echolocation calls respectively, with frequencies ranging from 138.4 to 116.6 kHz for the second harmonic and from 193.6 to 170.8 kHz for the third harmonic. We presume that, according to the echolocation call features, Myotis frater probably forages the insects on the ground of complex environments.展开更多
2008年4月,对四川绵阳采集到的斑蝠回声定位声波特征进行了初步研究。采用超声波监听仪(D1000X,Pettersson Elektronik AB)进行声波录制,用超声波分析软件Batsound 3.3(Pettersson Elektronik AB,瑞典)进行声波分析,结果表明:斑蝠发射...2008年4月,对四川绵阳采集到的斑蝠回声定位声波特征进行了初步研究。采用超声波监听仪(D1000X,Pettersson Elektronik AB)进行声波录制,用超声波分析软件Batsound 3.3(Pettersson Elektronik AB,瑞典)进行声波分析,结果表明:斑蝠发射的回声定位声波呈典型的短调频(FM)型,伴有2-3个谐波,能量主要集中在第2谐波。主频率为57.92±1.37 KHz,最低频率为22.85±2.56 KHz;最高频率为73.89±11.52 KHz。展开更多
文摘The relationship between echolocation frequency (represented by dominant frequency, DF for short) and body size (body mass, forearm length and body length) in 8 species of horseshoe bats ( Rhinolophus cornutus, R. affinis, R. thomasi, R. rouxi, R. blythii, R. ferrumequinum, R. pearsoni, R. rex ) was examined. The eight species were captured in caves in five regions (Guiyang, Anlong, Xingyi, Anshun and Zhenning) of Guizhou Province in July and August 1999 and June 2000. The species were identified based on the descriptions in Mammals of GuiZhou (Luo et al .)and Key to the Identification of Chiroptera (Wang, unpublished). The bats were captured at the entrance to the caves at about 8 pm (the time when bats usually leave the caves), and were then put into a recording room near the capture locations where they could fly freely. Recordings of their echolocation calls were made bout 2 hours later using an ultra sound detector (U30, Ultra Sound Advice, UK) which recorded the calls of bats that were flying directly at the microphone at a distance of 1 m. Each bat was recorded 5 times and the signals were fed into a portable ultra sound processor (PUSP, Ultra Sound Advice, UK). The duration for recording was 1 1 s with a sampling frequency of 44 1 kHz. By replaying the recorded tapes the best quality recordings (the loudest and clearest with the least background noise) were replayed at 1/10 speed and re recorded using a digital sound recorder (Sony, MD 1, frequency response range: 30～20 000 Hz). The re recorded echolocation signals were analyzed using the sound processing software Cool Edit 2000, developed by the American Syntrillium Software Company. Ultra sound analysis referred to the sound spectrograms (frequency time graph), time domain spectrograms (energy time graph), energy spectrograms (energy frequency graph), and Hanning window to obtain an analytic precision of 256 Hz. The analysis attenuation was 60 dB. The DF, pulse duration and interpulse interval of the echolocation calls were recorded and the duty cycle
文摘Echolocation calls of Myotis frater emitted during the search phase consist of brief frequency-modulated pulses. The sound signals are comprised of three harmonics of which the first one is of the highest intensity and occurs in all echolocation calls. The frequency of this fundamental harmonic ranges from 110.8 to 50.2 kHz, and its duration is about 3.5 ms. The second and the third harmonics are relatively weak, occurring in 50.0% and 25.0% of echolocation calls respectively, with frequencies ranging from 138.4 to 116.6 kHz for the second harmonic and from 193.6 to 170.8 kHz for the third harmonic. We presume that, according to the echolocation call features, Myotis frater probably forages the insects on the ground of complex environments.
文摘2008年4月,对四川绵阳采集到的斑蝠回声定位声波特征进行了初步研究。采用超声波监听仪(D1000X,Pettersson Elektronik AB)进行声波录制,用超声波分析软件Batsound 3.3(Pettersson Elektronik AB,瑞典)进行声波分析,结果表明:斑蝠发射的回声定位声波呈典型的短调频(FM)型,伴有2-3个谐波,能量主要集中在第2谐波。主频率为57.92±1.37 KHz,最低频率为22.85±2.56 KHz;最高频率为73.89±11.52 KHz。
