Acoustic parameters Environments Environments Environments Environments Environments
Highway (n = 19) Highway (n = 19) Natural (n = 20) Natural (n = 20) Natural (n = 20)
With chorus (n = 9)
Without chorus (n = 10)
With chorus (n = 6)
With chorus (n = 6)
Without chorus (n = 14)
Dominant frequency (kHz) 3473.3 – 345.7 3460.4 – 389.8 3874.5 – 298 3874.5 – 298 3889.9 – 314.1
Call duration (s) 5.554 – 0.803 5.713 – 1.712 5.751 – 1.736 5.751 – 1.736 5.127 – 0.719
Rise Time (s) 3.020 – 0.630 3.162 – 1.170 2.902 – 0.822 2.902 – 0.822 3.365 – 0.881
Interval between calls (s) 75 – 31.7 69.3 – 18.4 79.9 - 15 79.9 - 15 78.8 – 27.9
Notes number 18.7 – 2.948 17.9 – 2.514 19.3 – 2.658 19.3 – 2.658 18.2 – 3.445
Pulse number 806.9 – 239.3 1016.7 – 483.7 884.6 – 71.2 884.6 – 71.2 771.5 – 154.9
Pulse duration (s) 0.0028 – 0.0005 0.0026 – 0.0007 0.0024 – 0.0001 0.0025 – 0.0004 0.0025 – 0.0004
Intensity (dB) 71.1 – 4.22 69.9 – 4.06 71.7 – 7.20 70.8 – 6.14 70.8 – 6.14
Advertisement call rate (calls/5min) 3.6 – 1.414 3.9 – 1.100 3.3 – 1.032 3.7 – 1.138 3.7 – 1.138
Advertisement call total 7.5 – 3.16 7.1 – 1.72 6.6 – 1.21 7.1 – 2.21 7.1 – 2.21