Individual and collective choice: parallel prospecting and mining in ants

Area of Science:

• Animal Behavior
• Ecology
• Social Insects

Background:

• Group decision-making is vital for animal survival and social organization.
• Understanding how individual choices aggregate into collective actions is a key scientific question.
• Ant colonies exhibit complex social behaviors, including nest selection and resource exploitation.

Purpose of the Study:

• To investigate the decision-making mechanisms in ant colonies when choosing between potential nest sites.
• To determine if ants prioritize nest site characteristics related to ease of excavation.
• To explore how collective coordination in infrastructure production can occur without explicit signaling.

Main Methods:

• Conducted three experiments with 67 homeless ant colonies.
• Offered colonies a choice between two nest sites with varying sand grain sizes (small, big, mixed).
• Required colonies to excavate each potential nest site to assess preference based on excavation difficulty and time.

Main Results:

• Colonies that selected a single nest site overwhelmingly preferred those easiest and quickest to excavate.
• Nest site preference correlated with the physical properties of the sand grains influencing excavation effort.
• Demonstrated a collective choice mechanism driven by individual assessment of environmental factors.

Conclusions:

• Ant colonies can make coordinated decisions on nest site selection based on individual assessments of excavation efficiency.
• This study highlights a mechanism for social infrastructure development through positive feedback and individual effort, bypassing the need for direct communication signals.
• Findings offer insights into collective intelligence and emergent behavior in social insects.