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Individual differences in behaviour explain variation in survival: a meta-analysis.

Maria Moiron1, Kate L Laskowski2, Petri T Niemelä3

  • 1Centre d'Ecologie Fonctionnelle et Evolutive, UMR 5175 Campus CNRS, Montpellier, France.

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Animal personality research shows risky behaviors do not increase mortality. Instead, bold individuals live longer in the wild, suggesting behavioral differences significantly impact survival, contrary to existing theories.

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Among-individual variationanimal personalitybivariate modelfitnesslongevityrepeatabilityselectionsystematic review

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Area of Science:

  • Behavioral Ecology
  • Animal Behavior

Background:

  • Animal personality research investigates behavioral variation among individuals.
  • A central theory predicts that bolder, riskier behaviors lead to higher mortality rates.

Purpose of the Study:

  • To synthesize empirical evidence on the relationship between "risky" behavior and mortality in animals.
  • To test the prediction that individuals with riskier behaviors experience higher mortality.

Main Methods:

  • Systematic review and meta-analysis of existing studies on animal personality and survival.
  • Statistical analysis to determine the relationship between behavioral traits and mortality rates.

Main Results:

  • No directional relationship was found between riskier behavior and increased mortality.
  • A significant, albeit small (5.8%), portion of survival variance was explained by behavior.
  • Riskier behavioral types lived significantly longer in the wild, but not in laboratory settings.

Conclusions:

  • Individual differences in behavior significantly influence survival, but not in the direction predicted by current theories.
  • The findings suggest that "risky" behaviors may indicate higher individual quality, masked in lab environments.
  • Existing theoretical models on behavior, reproduction, and survival trade-offs may require revision.