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Behavioral DiverCity: individual differences in behavior change along an urbanization gradient.

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Urbanization impacts bird behavior, increasing individual differences in stress and anti-predator responses but decreasing variation in novelty-coping behaviors. This highlights varied effects of urban environments on animal behavior.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Animal Behavior

Background:

  • Urbanization is a global phenomenon altering ecosystems.
  • Understanding how anthropogenic changes affect individual variation in behavior is crucial for eco-evolutionary insights.
  • Limited knowledge exists on how urbanization modifies phenotypic variation, especially in behavioral traits.

Purpose of the Study:

  • To investigate how urbanization affects individual variation in behavioral traits.
  • To examine stress reactivity, anti-predator response, and novelty-coping behaviors in urban versus forest-dwelling great tits.
  • To determine if individual behavioral differences increase with urbanization and spatial environmental heterogeneity.

Main Methods:

  • Phenotyped over 1000 great tits (Parus major) over 9 years along an urbanization gradient.
  • Assessed breath rate, handling aggression, and exploration behavior as proxies for stress, anti-predator, and novelty-coping traits.
  • Employed both city vs. forest comparisons and a continuous urbanization gradient approach.

Main Results:

  • Urban great tits exhibited greater diversity in stress-related (breath rate) and anti-predator (handling aggression) behaviors compared to forest counterparts.
  • Exploratory behavior showed more similarity among urban individuals than forest individuals.
  • No significant evidence indicated changes in individual variation across traits with increasing percentage of built-up areas.

Conclusions:

  • Generalizations about behavioral trait responses to urbanization are unlikely across all behavioral dimensions.
  • Urban environments can lead to decreased individual diversity in specific behavioral traits, such as those related to novelty-coping.
  • The study underscores the complex and trait-specific impacts of urbanization on animal behavior and individual variation.