Skip to main content

Table 1 Among species and genera comparisons (I).

From: Geographic distribution of suitable hosts explains the evolution of specialized gentes in the European cuckoo Cuculus canorus

  

With gentes

Without gentes

Statistical tests for log-transformed variables

  

N

Mean (SE)

N

Mean (SE)

t-tests

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)

t-tests

 

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

  1. 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 pair-wise comparisons of closely related taxa (i.e., mean values of species with and without gentes within families) and phylogenetically independent contrasts.