High frequency audible calls in northern birch mice Sicista betulina in response to handling: effects of individuality, sex and body mass on the acoustics

Table 1 Values of measured variables and their relationships with birch mouse sex, individuality and body mass

Variable	Mean ± SD value			ANOVA		Pearson correlation with log body mass
Variable	All animal calls	Male calls	Female calls	Sex	Individual identity	Pearson correlation with log body mass
Duration (s)	0.46 ± 0.17	0.42 ± 0.17	0.54 ± 0.15	F_1,196 = 39.7; p < 0.001	F_9,196 = 22.8; p < 0.001	r = 0.29; p = 0.42
f0_max (kHz)	8.81 ± 0.61	8.83 ± 0.63	8.78 ± 0.57	F_1,196 = 0.08; p = 0.78	F_9,196 = 67.8; p < 0.001	r = 0.18; p = 0.62
f0_min (kHz)	7.61 ± 0.75	7.79 ± 0.55	7.31 ± 0.94	F_1,196 = 65.6; p < 0.001	F_9,196 = 82.5; p < 0.001	r = − 0.05; p = 0.90
f0_beg (kHz)	8.70 ± 0.71	8.70 ± 0.74	8.70 ± 0.65	F_1,196 = 2.06; p = 0.15	F_9,196 = 76.9; p < 0.001	r = 0.09; p = 0.80
f0_end (kHz)	7.95 ± 0.59	7.93 ± 0.57	7.99 ± 0.63	F_1,196 = 2.93; p = 0.09	F_9,196 = 29.3; p < 0.001	r = 0.28; p = 0.43
f_peak (kHz)	8.05 ± 0.74	8.14 ± 0.56	7.90 ± 0.98	F_1,196 = 6.23; p = 0.01	F_9,196 = 53.7; p < 0.001	r = − 0.16; p = 0.65
q₂₅ (kHz)	7.92 ± 0.67	8.02 ± 0.56	7.75 ± 0.81	F_1,196 = 16.3; p < 0.001	F_9,196 = 68.3; p < 0.001	r = − 0.06; p = 0.87
q₅₀ (kHz)	8.34 ± 0.68	8.31 ± 0.50	8.38 ± 0.93	F_1,196 = 2.38; p = 0.12	F_9,196 = 13.2; p < 0.001	r = − 0.01; p = 0.99
q₇₅ (kHz)	9.40 ± 1.72	8.87 ± 0.65	10.33 ± 2.47	F_1,196 = 73.1; p < 0.001	F_9,196 = 24.8; p < 0.001	r = − 0.11; p = 0.75
Bandwidth (kHz)	0.73 ± 0.36	0.70 ± 0.34	0.77 ± 0.39	F_1,196 = 2.06; p = 0.15	F_9,196 = 6.67; p < 0.001	r = − 0.15; p = 0.67
Body mass (g)	12.63 ± 2.23	12.59 ± 2.21	12.74 ± 2.76	F_1,8 = 0.01; p = 0.93

Designations: duration—call duration; f0_max—the maximum fundamental frequency; f0_min—the minimum fundamental frequency; f0_beg—the start fundamental frequency; f0_end—the end fundamental frequency; f_peak—the frequency of maximum amplitude; q₂₅, q₅₀, q₇₅—lower, medium and upper quartiles; bandwidth—the bandwidth of the f_peak at the distance of 10 dB from the maximum; p estimates less than 0.05 are shown in underline

ISSN: 1756-0500