Sexual and aggressive interactions in a visible burrow system with provisioned burrows.

Area of Science:

• Ethology
• Animal Behavior
• Social Dynamics

Background:

• The visible burrow system (VBS) allows for studying social interactions in mixed-sex rat colonies without the need for surface foraging.
• Removing the necessity for surface activity alters typical agonistic behaviors.

Purpose of the Study:

• To investigate novel agonistic interactions in mixed-sex rat colonies within a VBS.
• To understand the behavioral responses of subordinate males, dominant males, and females in this controlled environment.

Main Methods:

• Observation of mixed-sex rat colonies within a VBS equipped with food and water.
• Detailed recording of agonistic behaviors, including tunnel guarding, lunges, and lateral attacks.
• Analysis of interactions between dominant males and subordinate males, and dominant males and females.

Main Results:

• Subordinate males exhibited significant tunnel guarding, successfully repelling dominant males using vibrissae.
• Dominant males attempted entry via lunges and lateral attacks to tunnel walls, with limited success.
• Dominant-female interactions were frequent, initiated by males, and involved female defensive behaviors, but females did not guard tunnels.

Conclusions:

• Tunnel guarding is a specific defense strategy for subordinate males in VBS.
• Female rats display different social strategies, avoiding direct confrontation and utilizing surface areas.
• Male-female interactions appear to be primarily sexual advances countered by female defenses, protecting non-estrus females.