Banca de DEFESA: GABRIEL MACEDO ELEODORO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : GABRIEL MACEDO ELEODORO
DATA : 15/08/2022
HORA: 14:00
LOCAL: https://conferenciaweb.rnp.br/webconf/cibele-2
TÍTULO:

The evolution of female and male social signals and sexual dimorphism in antbirds (Aves: Thamnophilidae): patterns and processes

PÁGINAS: 329
GRANDE ÁREA: Ciências Biológicas
ÁREA: Zoologia
SUBÁREA: Comportamento Animal
RESUMO:

Social selection, via competition for sexual resources (e.g., mating partners) and non-sexual resources (e.g., territories) may promote the evolution of social signals and speciation. Traditionally, studies focused on male signals to investigate the evolution of sexual dimorphism and speciation under the assumption that female signals were not functional or not as developed as in males. However, females across diverse taxa also exhibit functional social traits, but the association of female signals with the evolution of sexual dimorphism and speciation is poorly known. I addressed this knowledge gap using antbirds as models (Aves: Thamnophilidae), a group wherein both sexes of many species use acoustic and visual signals – displays of songs and plumage – in social competition. Antbird species vary from sexually monomorphic to highly dimorphic in songs and plumage coloration, hence, antbirds constitute an excellent system to investigate the evolution of female and male social signals and sexual dimorphism. This dissertation is divided in three chapters. In chapter 1, I conducted field experiments simulating territorial invasions to test the hypothesis that plumage ornamentation of antbirds is positively associated with the intensity of aggressive territorial responses of females and males. I corroborated this hypothesis only in females, suggesting that plumage ornamentation mediates territorial competition in females. In males, on the other hand, plumage ornamentation is likely not associated with territorial competition and may evolve through other processes such as female mate choice. In chapter 2, I investigated whether sexual dimorphism is associated with climatic seasonality, a factor that may constrain resource availability and strengthen social competition. I found that species with lower sexual dimorphism and greater elaboration of social signals in females and males are associated with greater climatic seasonality, suggesting that environments wherein social competition is stronger may favor the evolution of social signals in both sexes. In chapter 3, I tested and corroborated the hypothesis that evolutionary rates of acoustic and visual signals of both sexes and of sexual dimorphism are positively correlated with speciation rates in antbirds. By investigating processes that shape the evolution of female and male social signals, this study shows that social signals of both sexes are relevant to understand the evolution of sexual dimorphism and the role of social selection in speciation. 

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1908726 - CIBELE BIONDO
Membro Titular - Examinador(a) Externo à Instituição - LILIAN TONELLI MANICA - UFPR
Membro Titular - Examinador(a) Externo à Instituição - RODRIGO HIRATA WILLEMART - USP
Membro Titular - Examinador(a) Externo à Instituição - FÁBIO CURY DE BARROS
Membro Titular - Examinador(a) Externo à Instituição - DIOGO BORGES PROVETE - UFMS
Membro Suplente - Examinador(a) Interno ao Programa - 1804548 - RICARDO JANNINI SAWAYA
Membro Suplente - Examinador(a) Externo à Instituição - FÁBIO SARUBBI RAPOSO DO AMARAL - UNIFESP
Membro Suplente - Examinador(a) Externo à Instituição - KÁTIA CRISTINA MACHADO PELLEGRINO - UNIFESP