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).

Autor: Macedo G; Center for Natural Sciences and Humanities, Federal University of ABC (UFABC), São Bernardo do Campo, SP, 09606-045, Brazil.; Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee, 37996., Marcondes RS; Museum of Natural Science, Louisiana State University, Baton Rouge, Louisiana, 70803.; Current Address: Department of Biosciences, Rice University, Houston, Texas, 77005., Biondo C; Center for Natural Sciences and Humanities, Federal University of ABC (UFABC), São Bernardo do Campo, SP, 09606-045, Brazil., Bravo GA; Sección de Ornitología, Colecciones Biológicas, Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Villa de Leyva, 154001, Colombia.; Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts, 02138., Derryberry EP; Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee, 37996.
Jazyk: angličtina
Zdroj: Evolution; international journal of organic evolution [Evolution] 2022 Dec; Vol. 76 (12), pp. 2893-2915. Date of Electronic Publication: 2022 Oct 25.
DOI: 10.1111/evo.14638
Abstrakt: 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.
(© 2022 The Authors. Evolution © 2022 The Society for the Study of Evolution.)
Databáze: MEDLINE
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