Evolutionary and Ecological Processes Underlying Geographic Variation in Innate Bird Songs

Autor(es)

Maldonado-Coelho, Marcos ; dos Santos, Sidnei S. ; Isler, Morton L. ; Svensson-Coelho, Maria ; Sotelo-Munoz, Manuelita ; Miyaki, Cristina Y. ; Ricklefs, Robert E. ; Blake, John G.

• Tipo de documento: Artigo Científico
• Fonte: American Naturalist; v. 202, n. 2, p. 22-pg., 2023-08-01.

Resumo

Ecological and evolutionary processes underlying spatial variation in signals involved in mate recognition and reproductive isolation are crucial to understanding the causes of population divergence and speciation. Here, to test hypotheses concerning the causes of song divergence, we examine how songs of two sister species of Atlantic Forest suboscine birds with innate songs, the Pyriglena fire-eye antbirds, vary across their ranges. Specifically, we evaluated the influence of isolation by distance and introgressive hybridization, as well as morphological and environmental variation, on geographic variation in male songs. Analyses based on 496 male vocalizations from 63 locations across a 2,200-km latitudinal transect revealed clinal changes in the structure of songs and showed that introgressive hybridization increases both the variability and the homogenization of songs in the contact zone between the two species. We also found that isolation by distance, morphological constraints, the environment, and genetic introgression independently predicted song variation across geographic space. Our study shows the importance of an integrative approach that investigates the roles of distinct ecological and evolutionary processes that influence acoustic signal evolution. (AU)

• Processo FAPESP: 13/50297-0 - Dimensions US-BIOTA São Paulo: integrando disciplinas para a predição da biodiversidade da Floresta Atlântica no Brasil
• Beneficiário: Cristina Yumi Miyaki
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático