Drivers of wing shape in a widespread Neotropical bird: a dual role of sex-specific and migration-related functions

Autor(es)

Carvalho Provinciato, Ivan C. ^[1] ; Araujo, Marcio S. ^[1] ; Jahn, Alex E. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Inst Biociencias Rio Claro, Ave 24A, 1515, Rio Claro, SP - Brazil

^[2] Smithsonian Conservat Biol Inst, Migratory Bird Ctr, 3001 Connecticut Ave NW, Washington, DC 20008 - USA

• Tipo de documento: Artigo Científico
• Fonte: EVOLUTIONARY ECOLOGY; v. 32, n. 4, p. 379-393, AUG 2018.
• Citações Web of Science: 2

Resumo

A large body of research has shown how avian morphology is shaped by specific behavioral repertoires and life history traits. Yet, the majority of such research has been conducted on birds breeding at north-temperate latitudes. We tested the hypothesis that functional wing traits of Fork-tailed Flycatchers (Tyrannus savana), which migrate within South America, vary predictably between non-migratory and migratory flycatchers. Additionally, due to sex-specific differences in this species (e.g., males perform courtship displays), we explored sex-related variation in wing shape. We applied classic measures of wing shape (e.g., wing loading, length, aspect ratio, pointedness), as well as landmark-based morphometric analysis to describe the wing morphology of Fork-tailed Flycatchers from breeding populations across South America. We found that migratory flycatchers tend to have more pointed wings than non-migratory flycatchers. Additionally, we found that males have wings that are significantly longer, more pointed, with a higher aspect ratio and that are more swept than those of females, regardless of whether they migrate or not. Overall, our results suggest that wing shape of Fork-tailed Flycatchers is the result of a complex set of tradeoffs shaped by selective pressures exerted on both sexes (i.e., the need to forage on the wing, evade predators and migrate efficiently), as well as sex-specific behaviors (e.g., the need for males to execute acrobatic displays). (AU)

• Processo FAPESP: 13/19116-9 - Morfologia comparada da asa da tesourinha (Tyrannus savana) na América do Sul
• Beneficiário: Ivan Celso Carvalho Provinciato
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 12/17225-2 - A evolução da migração das aves: a teoria atual se aplica na América do Sul?
• Beneficiário: Alejandro Edward Jahn
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores