The role of climate factors in geographic variation in body mass and wing length in a passerine bird

Table 1 Correlations between body mass or wing length of P. montanus and geographic and climate factors

Variable	Statistical parameter	Altitude	Latitude	MAT	AP	PRC	SUN	RH	WS
Body mass
	df	218	218	46	46	46	46	46	46
	Estimate	0.001	−0.026	−0.123	−0.010	−0.001	0.002	−0.070	0.422
	t	4.125	−0.518	−2.243	−4.088	−1.542	2.751	−2.768	1.138
	p	<0.001	0.605	0.026	<0.001	0.130	0.006	0.006	0.261
Wing length
Male	df	113	113	37	37	37	37	37	37
	Estimate	0.001	−0.052	−0.004	−0.009	−0.003	0.002	−0.129	0.167
	t	2.972	−0.868	−0.060	−2.643	−2.884	4.065	−5.407	0.341
	p	0.004	0.388	0.952	0.012	0.007	<0.001	<0.001	0.735
Female	df	77	77	34	34	34	34	34	34
	Estimate	0.001	−0.123	0.052	−0.009	−0.001	0.000	−0.067	−0.557
	t	2.811	−2.014	0.682	−2.807	−0.559	0.325	−2.027	−1.031
	p	0.006	0.050	0.497	0.008	0.580	0.746	0.046	0.310

Estimate model coefficients, df degree of freedom, MAT mean annual temperature, PRC annual precipitation, SUN annual sunshine hours, WS annual average wind speed, AP air pressure, RH relative humidity. Data on the body mass of each sex were pooled but wing length data were analyzed separately for each sex

ISSN: 2053-7166