Table 1 

Among species and genera comparisons (I). 

With gentes 
Without gentes 
Statistical tests for logtransformed variables 



N 
Mean (SE) 
N 
Mean (SE) 
ttests 



Analyses with species information 
Log population density 
10 
0.265 (0.444) 
69 
2.078 (0.324) 
t = 2.08, P = 0.041 
Log CV of population density 
10 
4.764 (0.190) 
69 
5.274 (0.059) 
t = 3.00, P = 0.004 



Phylogenetically independent contrasts 
Beta (SE) 
Corrected df 
Regression through the origin 



Log population density 
0.258 (0.110) 
63 
t = 2.35, P = 0.022 

Log CV of population density 
0.272 (0.110) 
63 
t = 2.49, P = 0.016 



Analyses with genus information 
N 
Mean (SE) 
N 
Mean (SE) 
ttests 



Log population density 
10 
1.304 (0.308) 
21 
0.960 (0.474) 
t = 3.13, P = 0.004 

Log CV of population density 
10 
4.353 (0.151) 
21 
5.160 (0.111) 
t = 4.22, P = 0.001 



Phylogenetically independent contrasts 
Beta (SE) 
Corrected df 
Regression through the origin 



Log population density 
0.464 (0.164) 
27 
t = 2.82, P = 0.015 



Log CV of population density 
0.580 (0.151) 
27 
t = 3.83, P = 0.001 



Among species and genera comparisons of mean and coefficient of variation (CV) in population density of suitable host passerine species for which the European cuckoo has or has not evolved specific gentes (i.e., highly mimetic egg morphs). Possible phylogenetic dependence of data was taken into account by using pairwise comparisons of closely related taxa (i.e., mean values of species with and without gentes within families) and phylogenetically independent contrasts. 

Soler et al. BMC Evolutionary Biology 2009 9:88 doi:10.1186/14712148988 