Shyness and boldness in pumpkinseed sunfish: individual differences are context-specific

Area of Science:

• Behavioral Ecology
• Evolutionary Biology
• Animal Behavior

Background:

• Natural selection favors diverse behavioral phenotypes within populations.
• Individual differences in risk-taking, such as shyness and boldness, are observed across species.
• Shyness and boldness are often assumed to be general personality traits, but this may not hold true across different ecological contexts.

Purpose of the Study:

• To investigate the context specificity of shyness and boldness in juvenile pumpkinseed sunfish (Lepomis gibbosus).
• To determine if individual differences in risk-taking are consistent across different behavioral contexts.
• To explore the relationship between shyness/boldness and foraging/predator response behaviors.

Main Methods:

• Assessed shyness and boldness using a threatening stimulus (metrestick) and a novel food source in pumpkinseed sunfish.
• Observed fish behavior during focal observations, both before and after predator introduction (largemouth bass).
• Correlated individual differences in shyness and boldness across different contexts.

Main Results:

• Consistent individual differences in shyness and boldness were found within specific contexts.
• Individual differences in shyness and boldness did not correlate across different contexts.
• Fish with intermediate responses to the metrestick exhibited bolder foraging and predator response behaviors.

Conclusions:

• Shyness and boldness are context-specific behavioral traits in pumpkinseed sunfish.
• Behavioral variation in shyness and boldness does not represent a single, consistent personality dimension.
• Adaptive variation in risk-propensity may be finely tuned to specific environmental challenges.