Growing in circles: rearing environment alters spatial navigation in fish

Area of Science:

• Behavioral Ecology
• Comparative Psychology
• Neuroscience

Background:

• Many animal species utilize the geometric properties of their environment for navigation.
• The influence of early environmental exposure on the development of navigational strategies is not fully understood.
• Previous research suggests rearing environments can impact spatial task performance.

Purpose of the Study:

• To investigate how the geometric properties of the rearing environment affect the use of geometric versus featural navigational cues in convict cichlids.
• To determine if exposure to angular geometric cues during development is necessary for geometric cue utilization.
• To assess the impact of rearing environment on cue dominance when geometric and featural information conflict.

Main Methods:

• Convict cichlids were reared in either circular or rectangular tanks.
• Navigational cue use was tested in a controlled environment with and without featural cues.
• The study analyzed fish behavior when geometric and featural cues were in conflict.

Main Results:

• All fish demonstrated the ability to use geometric information for navigation when no features were present.
• In the presence of features, fish independently utilized both geometric and featural information.
• Fish reared in circular tanks exhibited significantly reduced reliance on geometric information when cues were conflicting compared to those reared in rectangular tanks.

Conclusions:

• The capacity for geometric navigation does not strictly require early exposure to angular geometric cues.
• The rearing environment plays a significant role in modulating the dominance of featural and geometric cues in spatial orientation.
• Environmental enrichment during development can shape sophisticated navigational strategies.