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Behavioral Approaches to Studying Innate Stress in Zebrafish
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Published on: May 1, 2019

Variable neuroendocrine responses to ecologically-relevant challenges in sticklebacks.

Alison M Bell1, Tobias Backström, Felicity A Huntingford

  • 1Integrative Biology, University of Illinois at Urbana-Champaign, 505 South Goodwin Ave., Urbana, IL 61801, USA. alisonmb@life.uiuc.edu

Physiology & Behavior
|February 27, 2007
PubMed
Summary

Sticklebacks show varied neuroendocrine stress responses to different challenges. Brain chemistry, including serotonin and norepinephrine, changes differently when facing predators versus rivals, impacting behavior.

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Area of Science:

  • Behavioral Ecology
  • Neuroendocrinology
  • Animal Behavior

Background:

  • Individual stress responses can vary significantly.
  • Understanding neuroendocrine adaptations to ecological challenges is crucial for species survival.

Purpose of the Study:

  • To compare behavioral, endocrine, and neuroendocrine responses of sticklebacks to two distinct stressors: a predator and an unfamiliar conspecific.
  • To investigate the relationship between brain monoamine levels and specific behaviors in sticklebacks under stress.

Main Methods:

  • Exposure of individual sticklebacks to either a predator or a conspecific.
  • Measurement of whole-body cortisol concentrations to assess the hypothalamic-pituitary-interrenal (HPI) axis response.
  • Quantification of brain monoamine (serotonin, dopamine, norepinephrine) and metabolite concentrations using HPLC.

Main Results:

  • Both stressors induced similar HPI axis responses (cortisol levels).
  • Distinct patterns of brain monoamine and metabolite changes were observed between the predator and conspecific stress conditions.
  • Norepinephrine levels were elevated with predator exposure but decreased with conspecific challenge.
  • Serotonin and norepinephrine levels in specific brain regions correlated with behavioral responses like aggression and predator inspection.

Conclusions:

  • The neuroendocrine stress response in sticklebacks is context-dependent, varying with the nature of the ecological challenge.
  • Interindividual differences in behavioral responses to stressors are mirrored by neuroendocrine variations, particularly in brain monoamine profiles.