Asynchronous evolution of interdependent nest characters across the avian phylogeny

Area of Science:

• Evolutionary biology
• Ornithology
• Animal behavior

Background:

• Nest building is a key avian adaptation linked to environmental pressures and evolutionary history.
• Understanding the evolutionary pathways of nest construction and its relationship with avian phylogeny is crucial.

Purpose of the Study:

• To investigate the evolutionary trajectories of three primary nest characters: structure, site, and attachment, across all bird families.
• To determine the phylogenetic signal and interdependence of these nest traits.

Main Methods:

• Comparative analysis of nest structure, site, and attachment evolution across avian families.
• Phylogenetic signal assessment for each nest character.
• Examination of trait interdependence and evolutionary lability.

Main Results:

• Nest characters evolved with disparate evolutionary trajectories, not synchronically across avian phylogeny.
• Nest structure exhibits a stronger phylogenetic signal than nest site; nest attachment shows minimal variation.
• Nest traits evolved interdependently, with novel structures/attachments potentially enabling new nest sites.
• Passerines demonstrate more labile nest characters compared to other bird groups.

Conclusions:

• Avian nest evolution is characterized by independent yet interconnected trait diversification.
• Nest evolution is linked to adaptive radiations, contributing to the diversity of modern bird lineages.
• The findings offer significant insights into the evolutionary processes shaping avian nests.