Data from: The effects of life history and sexual selection on male and female plumage colouration
| Main Authors: | Dale, James, Dey, Cody J., Delhey, Kaspar, Kempenaers, Bart, Valcu, Mihai |
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| Format: | info dataset Journal |
| Terbitan: |
, 2016
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/5006927 |
Daftar Isi:
- Classical sexual selection theory provides a well-supported conceptual framework for understanding the evolution and signalling function of male ornaments. It predicts that males obtain greater fitness benefits than females through multiple mating because sperm are cheaper to produce than eggs. Sexual selection should therefore lead to the evolution of male-biased secondary sexual characters. However, females of many species are also highly ornamented. The view that this is due to a correlated genetic response to selection on males was widely accepted as an explanation for female ornamentation for over 100 years and current theoretical and empirical evidence suggests that genetic constraints can limit sex-specific trait evolution. Alternatively, female ornamentation can be the outcome of direct selection for signalling needs. Since few studies have explored interspecific patterns of both male and female elaboration, our understanding of the evolution of animal ornamentation remains incomplete, especially over broad taxonomic scales. Here we use a new method to quantify plumage colour of all ~6,000 species of passerine birds to determine the main evolutionary drivers of ornamental colouration in both sexes. We found that conspecific male and female colour elaboration are strongly correlated, suggesting that evolutionary changes in one sex are constrained by changes in the other sex. Both sexes are more ornamented in larger species and in species living in tropical environments. Ornamentation in females (but not males) is increased in cooperative breeders—species in which female–female competition for reproductive opportunities and other resources related to breeding may be high. Finally, strong sexual selection on males has antagonistic effects, causing an increase in male colouration but a considerably more pronounced reduction in female ornamentation. Our results indicate that although there may be genetic constraints to sexually independent colour evolution, both female and male ornamentation are strongly and often differentially related to morphological, social and life-history variables.
- Plumage coloration in passerine birdsPlumage colour scores (N=5831 species) and predictor variables (N = 2471 species) in passerine birds. This data set includes plumage scores for males and females as calculated from RGB (red, green, blue) values measured from plates in the Handbook of the Birds of the World (see text of article for details). Additionally we include the values of the 5 key predictor variables: 1) body size (first phylogenetic principle component (PPC1) of body mass and wing length), 2) tropical life history (PPC1 of latitude, seasonality and clutch size), 3) sexual selection (PPC1 of mating system, sexual size dimorphism and paternal care), 4) cooperative breeding (no = 0 and yes = 1) and 5) migration (none = 0, partial = 0.5 and complete = 1). All predictor variables were scaled to a mean = 0 and standard deviation = 1. These variables were used in the multiple predictor phylogenetic generalized least squares model, Markov Chain Monte Carlo generalized linear mixed models and phylogenetic controlled d separation path analysis (Table 1b, Figure 4 and Figure 5 of the article respectively). Scientific names, English names and TipLabels correspond to the phylogenetic trees provided by www.birdtree.org (Jetz, W., Thomas, G., Joy, J., Hartmann, K., & Mooers, A. 2012. The global diversity of birds in space and time. Nature, 491(7424), 444-448).plumage_scores.csv