Table 1 Exploratory data analysis of the calls of Uperodon systoma

Call rate (1/s)

3 ± 0.97

0.22–5.98

26.53^d

26.99

1.017

17.67

< 0.001

0.466

Call duration (ms)

38.73 ± 4.52

30–57

6.67ⁱ

9.71

1.455

167.14

< 0.001

0.912

Rise time (ms)

19.41 ± 2.27

15–28

6.79ⁱ

10.4

1.532

165.79

< 0.001

0.911

Fall time (ms)

19.41 ± 2.28

15–28

7.02ⁱ

9.25

1.318

172.11

< 0.001

0.914

Low peak frequency (Hz)

443.98 ± 18.82

408–491.4

1.65^s

4.3

2.605

120.53

< 0.001

0.850

High peak frequency (Hz)

2689.53 ± 162.71

2290.3–3147.5

2.92^s

5.95

2.033

51.92

< 0.001

0.709

Delta power (dB)

7.76 ± 4.08

− 0.4 – 19.7

29.52^d

48.44

1.641

36.49

< 0.001

0.631

FM of low frequency (Hz)

−16.99 ± 17.66

−66 – 27.8

−109.74^d

−30.17

0.275

2.09

< 0.05

0.089

FM of high frequency (Hz)

−173.43 ± 150.87

− 559.6 – 250.4

−52.95^d

−76.13

1.438

15.86

< 0.001

0.426

Dominant harmonic

12.14 ± 0.88

9.88–14.21

3.34^s

6.7

2.005

67.63

< 0.001

0.760