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. 2015 Nov 2;5(22):5413-5422.
doi: 10.1002/ece3.1793. eCollection 2015 Nov.

Selection and Inheritance of Sexually Dimorphic Juvenile Plumage Coloration

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Free PMC article

Selection and Inheritance of Sexually Dimorphic Juvenile Plumage Coloration

Angela Tringali et al. Ecol Evol. .
Free PMC article

Abstract

Sexually dimorphic plumage coloration is widespread in birds and is generally thought to be a result of sexual selection for more ornamented males. Although many studies find an association between coloration and fitness related traits, few of these simultaneously examine selection and inheritance. Theory predicts that sex-linked genetic variation can facilitate the evolution of dimorphism, and some empirical work supports this, but we still know very little about the extent of sex linkage of sexually dimorphic traits. We used a longitudinal study on juvenile Florida scrub-jays (Aphelocoma coerulescens) to estimate strength of selection and autosomal and Z-linked heritability of mean brightness, UV chroma, and hue. Although plumage coloration signals dominance in juveniles, there was no indication that plumage coloration was related to whether or not an individual bred or its lifetime reproductive success. While mean brightness and UV chroma are moderately heritable, hue is not. There was no evidence for sex-linked inheritance of any trait with most of the variation explained by maternal effects. The genetic correlation between the sexes was high and not significantly different from unity. These results indicate that evolution of sexual dimorphism in this species is constrained by low sex-linked heritability and high intersexual genetic correlation.

Keywords: Aphelocoma coerulescens; Z‐linkage; intersexual genetic correlation; maternal effects; plumage color; sex linkage.

Figures

Figure 1
Figure 1
A juvenile Florida scrub‐jay. Although juveniles have blue wings and tails like adults, they are easily distinguished by their brown heads, which are blue in adults. Photograph by Reed Bowman.
Figure 2
Figure 2
Predicted selection gradients ± standard error for mean brightness, UV chroma, and hue in Florida scrub‐jays. The figure for mean brightness shows females in black and males in gray. Sexes are shown together for UV chroma and hue because for these variables models that excluded sex had lower AIC values. We chose to visualize these gradients using curves rather than traditional linear Lande–Arnold selection gradients because the data are nonlinear.

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