Table 2

Between species comparisons (II).

Raw data: GLZ (Binomial distribution and logit link function). Dependent variable: with vs without specialized cuckoo egg morphs


Population Density

CV population density

Body mass

Duration of nestling period


Model 1

χ2 = 5.17, P = 0.023

χ2 = 0.74, P = 0.39

χ2 = 0.66, P = 0.42

Model 2

χ2 = 7.72, P = 0.005

χ2 = 0.86, P = 0.35

χ2 = 0.65, P = 0.42


Phylogenetically independent contrasts: Multiple regression throughout the origin


Beta(SE)

Beta(SE)

Beta(SE)

Beta(SE)

Model 1

0.24(0.11), P < 0.04

0.16(0.11), P > 0.1

0.09(0.11), P > 0.4

Model 2

-0.28(0.11), P = 0.01

0.19(0.11), P > 0.1

0.12(0.11), P > 0.2


Comparisons between species for which the European cuckoo has and has not evolved specialized egg morphs. Raw data were compared by means of Generalized Linear Models and Chi-square statistic (df = 1 for all performed analyses). Phylogentically independent contrasts were compared by means of regression analyses through the origin (corrected df = 64 for all performed analyses). Model 1 and model 2 respectively include population density and coefficient of variation (CV) in population density as independent variables.

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

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