Evolution of avian foot morphology through anatomical network analysis

Area of Science:

• Evolutionary Biology
• Comparative Anatomy
• Biomechanics

Background:

• Avian evolution has resulted in diverse foot morphologies adapted for various lifestyles and skills.
• The avian foot's muscle system is diverse, supporting different locomotor and manipulative functions.

Purpose of the Study:

• To investigate the evolutionary and functional significance of avian foot architecture.
• To apply Anatomical Network Analysis to understand connectivity patterns in avian feet.

Main Methods:

• Anatomical Network Analysis was employed to study the connectivity patterns of anatomical parts in avian feet.
• The study analyzed conserved and novel anatomical features across bird evolution, including ancestral dinosaurs.

Main Results:

• Anatomical parts conserved from ancestral dinosaurs exhibit the highest connectivity.
• No correlation was found between foot network complexity and specialized skills or task diversity.
• A macroevolutionary trend towards simplification of foot networks within birds was observed.
• Avian foot networks are phylogenetically constrained and conserved across diverse foot types.

Conclusions:

• Avian foot architecture shows deep evolutionary conservation, with key parts originating in ancestral dinosaurs.
• Functional specialization in birds is not directly linked to increased foot network complexity.
• Phylogenetic constraints and stabilizing selection likely maintain conserved foot network structures in birds.