Functional and mechanistic diversity in ant tandem communication

Area of Science:

• Animal behavior
• Social organization
• Evolutionary biology

Background:

• Social insects exhibit convergent evolution in communication, yet underlying mechanisms can differ.
• Tandem running is a common recruitment behavior in ants, but its precise function may vary.

Purpose of the Study:

• To differentiate the functional roles of tandem running in two ant genera, Temnothorax and Diacamma.
• To investigate mechanistic differences in communication strategies using network and information-theoretic analyses.

Main Methods:

• Network analysis was applied to map communication pathways during recruitment.
• Information-theoretic analysis quantified information transfer in movement trajectories.
• Comparative analysis was performed between Temnothorax and Diacamma tandem behaviors.

Main Results:

• Temnothorax uses tandem running to recruit additional recruiters, distinct from their social carrying behavior.
• Diacamma primarily uses tandem running for mass transport of the colony, not for recruiting more recruiters.
• Network structures differed, with Diacamma tandems resembling Temnothorax social carrying networks.
• Diacamma tandem runs lacked bidirectional information transfer, indicating no route learning.

Conclusions:

• Tandem running serves divergent functions in Temnothorax and Diacamma, highlighting functional convergence masking mechanistic divergence.
• This study quantifies communication system diversity, enhancing our understanding of animal social organization and evolution.