Table 1

Among species and genera comparisons (I).

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


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.

Soler et al. BMC Evolutionary Biology 2009 9:88   doi:10.1186/1471-2148-9-88

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