Speciation and population divergence in a mutualistic seed dispersing bird

Area of Science:

• Ecology
• Evolutionary Biology
• Ornithology

Background:

• Bird-mediated seed dispersal is essential for ecosystem regeneration and forms complex mutualistic networks.
• The evolutionary impact of this mutualism on seed-dispersing birds remains poorly understood.

Purpose of the Study:

• To investigate the evolutionary processes shaping the diversification of the Eurasian nutcracker (Nucifraga).
• To assess the role of mutualism with pines (Pinus) in nutcracker evolution.

Main Methods:

• Whole genome re-sequencing analyses.
• Morphometric data analysis.

Main Results:

• Nutcracker divergence and phylogeographic patterns align with non-mutualistic passerine birds.
• Early diversification appears influenced by biogeographic and climatic factors.
• Limited variation in foraging traits suggests a minor role for local adaptation to pines.

Conclusions:

• Close mutualistic relationships may not be the primary driver of evolution and diversification in specialized birds.
• Biogeographic and climatic factors played a significant role in Eurasian nutcracker diversification.