Ontogeny of audible squeaks in yellow steppe lemming Eolagurus luteus: trend towards shorter and low-frequency calls is reminiscent of those in ultrasonic vocalization

Table 3 Pearson’s correlation coefficients between body size index, log body mass, body length, head length, foot length, tail length and the acoustic parameters

Parameter	n	Duration	f0beg	f0max	f0end	f0min	df0	fpeak
Log₃ body mass	120	r = -0.26, p = 0.004	r = -0.65, p < 0.001	r = -0.79, p < 0.001	r = -0.52, p < 0.001	r = -0.61, p < 0.001	r = -0.64, p < 0.001	r = -0.55, p < 0.001
Body length	120	r = -0.22, p = 0.017	r = -0.66, p < 0.001	r = -0.77, p < 0.001	r = -0.53, p < 0.001	r = -0.62, p < 0.001	r = -0.60, p < 0.001	r = -0.51, p < 0.001
Head length	120	r = -0.28, p = 0.002	r = -0.59, p < 0.001	r = -0.78, p < 0.001	r = -0.44, p < 0.001	r = -0.53, p < 0.001	r = -0.66, p < 0.001	r = -0.52, p < 0.001
Foot length	120	r = -0.31, p < 0.001	r = -0.62, p < 0.001	r = -0.81, p < 0.001	r = -0.47, p < 0.001	r = -0.56, p < 0.001	r = -0.69, p < 0.001	r = -0.57, p < 0.001
Tail length	120	r = -0.36, p < 0.001	r = -0.57, p < 0.001	r = -0.77, p < 0.001	r = -0.49, p < 0.001	r = -0.53, p < 0.001	r = -0.66, p < 0.001	r = -0.59, p < 0.001
Body size index	120	r = -0.25, p = 0.005	r = -0.64, p < 0.001	r = -0.79, p < 0.001	r = -0.52, p < 0.001	r = -0.60, p < 0.001	r = -0.64, p < 0.001	r = -0.54, p < 0.001

Threshold for significant values after Bonferroni correction comprises p < 0.007
Designations: n Number of individuals, duration Call duration, f0beg The fundamental frequency at the onset of a call, f0max The maximum fundamental frequency, f0min The minimum fundamental frequency, f0end The fundamental frequency at the end of a call, df0 The depth of frequency modulation, fpeak The frequency of maximum amplitude

ISSN: 2056-3132