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Table 2 Spearman’s rank correlation between morphological measurements in the Oriental Magpie (Pica serica) and the Oriental Tit (Parus minor)

From: Bergmann’s rule and Allen’s rule in two passerine birds in China

Species Traits Parameter Male Female
Body mass Wing length Bill length Body mass Wing length Bill length
Pica serica Wing length r 0.382    0.414   
p < 0.001    < 0.001   
n 80    81   
Bill length r 0.276 0.170   0.459 0.236  
p 0.016 0.136   < 0.001 0.043  
n 76 78   72 74  
Tarsus length r 0.462 0.126 0.510 0.333 0.244 0.486
p < 0.001 0.264 < 0.001 0.003 0.029 < 0.001
n 79 81 77 78 80 74
Parus minor Wing length r 0.291    0.368   
p < 0.001    < 0.001   
n 259    130   
Bill length r ‒ 0.009 ‒ 0.136   0.033 0.097  
p 0.893 0.033   0.721 0.292  
n 241 243   122 121  
Tarsus length r 0.223 0.170 0.108 0.092 0.182 0.197
p < 0.001 0.007 0.102 0.313 0.045 0.036
n 245 247 229 122 121 114