Interspecific Competition Reduces Energy Expenditure by Decreasing Intragroup Conflict in a Social Burying Beetle

Area of Science:

• Behavioral Ecology
• Evolutionary Biology
• Physiological Ecology

Background:

• Assessing the physiological costs of sociality is complex due to intertwined environmental and social factors.
• Understanding energy expenditure in social species requires integrating game theory with empirical data.

Purpose of the Study:

• To investigate how interspecific competition impacts energy expenditure in the cooperatively breeding Asian burying beetle (Nicrophorus nepalensis).
• To test predictions derived from a game theory model regarding physiological costs and social conflict under competition.

Main Methods:

• Integrated game theory with empirical research on Nicrophorus nepalensis.
• Utilized thermal imaging to measure body temperature as an indicator of thermogenic effort.
• Analyzed energy expenditure during carcass work under conditions of interspecific competition.

Main Results:

• Beetles facing interspecific competition (with blowflies) exhibited lower body temperatures, indicating reduced thermogenic effort.
• Competition led to less pronounced differences in body temperature between social ranks.
• Results supported the model's predictions of lower physiological costs and reduced intragroup conflict.

Conclusions:

• Reduced social conflict can outweigh the energetic costs of increased cooperation when facing external threats.
• Environmental conditions significantly shape energy allocation strategies in social species.
• This study provides novel insights into the interplay between sociality, competition, and energy expenditure.