Skip to main content
Dryad

Data from: The evolution of sex similarities in social signals: Climatic seasonality is associated with lower sexual dimorphism and greater elaboration of female and male signals in antbirds (Thamnophilidae)

Cite this dataset

Macedo, Gabriel et al. (2022). Data from: The evolution of sex similarities in social signals: Climatic seasonality is associated with lower sexual dimorphism and greater elaboration of female and male signals in antbirds (Thamnophilidae) [Dataset]. Dryad. https://doi.org/10.5061/dryad.z34tmpghn

Abstract

Selection on signals that mediate social competition varies with resource availability. Climate regulates resource availability, which may affect the strength of competition and selection on signals. Traditionally, this meant that more seasonal, colder, or dryer – overall harsher – environments should favor the elaboration of male signals under stronger male-male competition, increasing sexual dimorphism. However, females also use signals to compete; thus, harsher environments could strengthen competition and favor elaboration of signals in both sexes, decreasing sexual dimorphism. Alternatively, harsher environments could decrease sexual dimorphism due to scarcer resources to invest in signal elaboration in both sexes. We evaluated these contrasting hypotheses in antbirds, a family of Neotropical passerines that varies in female and male signals and occurs across diverse climatic regimes. We tested the association of sexual dimorphism of plumage coloration and songs with temperature, precipitation and their seasonality. We found that greater seasonality is associated with lower sexual dimorphism in plumage coloration and greater elaboration of visual signals in both sexes, but not acoustic signals. Our results suggest that greater seasonality may be associated with convergent elaboration of female and male visual signals, highlighting the role of signals of both sexes in the evolution of sexual dimorphism.

Usage notes

Compressed folder “Macedo_et_al_2022_Evolution.rar” contains data and R code to replicate analyses of the paper:

“The evolution of sex similarities in social signals: climatic seasonality is associated with lower sexual dimorphism and greater elaboration of female and male signals in antbirds (Thamnophilidae)”

Description_of_Variables.xlsx describes variables of all datasets. 

READ_ME.txt describes contents of all sub-directories.

Funding

Coordenação de Aperfeicoamento de Pessoal de Nível Superior, Award: 001

Fulbright Brasil

National Council for Scientific and Technological Development, Award: 201234/2014-9

National Science Foundation