Table 2. Results of the fixed effects from linear mixed-effects models for the relationships between forearm length (from mist net data), characteristic frequencies (from acoustic data) and climatic and geographic variables represented by principal components.

	Estimate	SE	t-value	P
Forearm length (n = 1351)
Male	−0.76	0.05	−15.74	<0.000
Day of the year	−0.00	0.00	−0.33	0.744
M.PC1	0.05	0.01	3.42	<0.000
M.PC2	−0.02	0.02	−0.87	0.385
Characteristic frequency (n = 4783)
SlopeQCF	−0.72	0.04	−27.62	<0.000
Second Survey	0.68	0.06	11.76	<0.000
Call abundance	−0.00	0.00	−0.25	0.806
A.PC1	−0.00	0.03	−0.13	0.900
A.PC2	0.11	0.03	3.10	0.003

Notes.

SlopeQCF, slope of the quasi-constant-frequency.