Ritualised versus aggressive behaviours displayed by Polyrhachis laboriosa (F. Smith) during intraspecific...

Area of Science:

• Behavioral Ecology
• Ethology
• Animal Behavior

Background:

• Intraspecific territoriality is crucial for resource monopolization and reproductive success in social insects.
• Polyrhachis laboriosa, an ant species, exhibits complex social interactions influencing its territorial behavior.

Purpose of the Study:

• To investigate the territorial behavior of Polyrhachis laboriosa through dyadic confrontations.
• To understand the role of chemical marking and social context in mediating aggressive and ritualized behaviors.

Main Methods:

• Dyadic confrontations between nestmates and alien foragers in marked and unmarked arenas.
• Complementary field observations and experiments in natural habitats.
• Detailed description of aggressive and ritualized displays during encounters.

Main Results:

• Alien foragers typically flee from residents, while residents attack, particularly in marked territories.
• Alien scouts initiating territorial expansion exhibit high aggression towards residents.
• Ritualized displays (threatening, appeasing) observed in low-aggression contexts, including queen-worker interactions.
• Foraging queens are tolerated but elicit ritualized displays from workers near nests or food sources.

Conclusions:

• Polyrhachis laboriosa demonstrates sophisticated territorial defense mechanisms involving aggression and ritualized communication.
• The species' social structure provides indirect protection for queens, potentially compensating for their semi-claustral founding strategy.
• Understanding these behaviors is key to comprehending the species' ecological dynamics and social organization.