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Performance on innate behaviour during early development as a function of stress level.

Soojin Ryu¹, Rodrigo J De Marco^2,3

¹Developmental Neurobiology of Resilience, University Medical Center, Johannes Gutenberg University Mainz, Duesbergweg 6, 55128, Mainz, Germany. soojin.ryu@uni-mainz.de.

Scientific Reports

|August 12, 2017

Summary

Moderate stress during early development enhances innate behaviors in zebrafish. Higher stress levels do not improve, and may impair, performance on instinctive activities, revealing an inverted-U relationship.

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Area of Science:

Neuroscience
Developmental Biology
Animal Behavior

Background:

The relationship between acute stress and innate behavior performance is not well understood.
Existing research suggests an inverted-U shaped relationship between stress and learning/memory, but its applicability to innate behaviors is unclear.

Purpose of the Study:

To investigate the impact of varying acute stress levels on innate behavior performance in developing zebrafish (Danio rerio).
To determine if an inverted-U shaped performance function exists for innate behaviors under different stress conditions.

Main Methods:

Developing zebrafish were exposed to moderate and higher levels of acute stress.
Performance on innate activities driven by visual, hydrodynamic, and thermal stimuli was assessed.

Main Results:

Moderate stress levels significantly improved performance on innate activities.
Higher stress levels did not enhance, and potentially impaired, performance.
This demonstrates an inverted-U shaped performance function related to developmental stress levels.

Conclusions:

Early life stress exhibits an inverted-U shaped effect on innate behavior performance in zebrafish.
These findings provide the first evidence of such a non-linear relationship for innate behaviors across multiple sensory modalities.