Knowledgeable individuals lead collective decisions in ants.

Area of Science:

• Animal behavior
• Collective intelligence
• Social organization

Background:

• Self-organization drives collective behavior in animal groups through local interactions.
• While leadership is recognized, self-organized decisions are often assumed to be shared equally among decision-makers.
• Conflicts of interest are typically considered necessary for unequal influence in group decisions.

Purpose of the Study:

• To investigate if specific individuals hold disproportionate influence in self-organized decisions within a group sharing identical interests.
• To examine the role of private information and memory in collective decision-making during nest site selection.
• To determine if informed individuals can act as leaders in collective choices, even without conflicts of interest.

Main Methods:

• Studied nest site selection in the ant species Temnothorax albipennis.
• Tracked the influence of workers with prior knowledge of a familiar nest site versus naive workers.
• Assessed recruitment and transport behaviors to evaluate decision-making contributions.

Main Results:

• Workers with prior memory of a familiar nest site navigated and located it more efficiently.
• Informed workers expedited decisions favoring the familiar nest over novel sites.
• Informed workers significantly increased their share in recruitment and transport, driving collective preference.

Conclusions:

• Self-organized decisions are not always evenly distributed among decision-makers, even when interests align.
• Knowledgeable individuals can exert disproportionate influence, acting as effective leaders in collective choices.
• Animal groups can benefit from the enhanced performance driven by well-informed members in decision-making processes.