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Repeatable and heritable behavioural variation in a wild cooperative breeder.

Hannah A Edwards1, Terry Burke1, Hannah L Dugdale2,3,4

  • 1Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK.

Behavioral Ecology : Official Journal of the International Society for Behavioral Ecology
|April 7, 2018
PubMed
Summary

Animal personality differences are repeatable and heritable, providing key insights into behavioral evolution. This study quantifies these traits in Seychelles warblers, revealing moderate repeatability and heritability in exploratory behaviors.

Keywords:
Cooperative breedingSeychelles warblerexplorationheritabilitypersonalityrepeatability

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Area of Science:

  • Behavioral ecology
  • Evolutionary biology
  • Quantitative genetics

Background:

  • Consistent individual differences in behavior (animal personality) are crucial for understanding ecological and evolutionary processes.
  • Repeatability and heritability quantify the variation in behavior that can be attributed to individual differences and additive genetic variance, respectively.
  • These metrics are essential for determining the evolutionary potential of behavioral traits under natural selection.

Purpose of the Study:

  • To estimate the repeatability and narrow-sense heritability (h²B) of four behavioral traits in a natural population of Seychelles warblers (Acrocephalus sechellensis).
  • To assess the evolvability of repeatable behavioral traits.
  • To investigate the among-individual correlation between repeatable behavioral traits.

Main Methods:

  • Behavioral data were collected from a population of Seychelles warblers on Cousin Island.
  • Four behavioral traits were quantified: novel environment exploration, novel object exploration, obstinacy/struggle rate, and escape response.
  • Statistical analyses were performed to estimate repeatability, heritability (h²B), and correlations between traits.

Main Results:

  • Exploratory behaviors (novel environment and novel object exploration) showed moderate repeatability (0.23-0.37).
  • A significant positive among-individual correlation (0.51) was found between novel environment and novel object exploration.
  • Novel environment exploration was moderately heritable (0.17), with low heritability for behavior (h²B) due to observer variance.

Conclusions:

  • The study demonstrates that key behavioral traits in Seychelles warblers are repeatable and heritable, indicating potential for evolutionary change.
  • Findings contribute to understanding the additive genetic variance available for natural selection to act upon in this cooperatively breeding species.
  • The results highlight the importance of quantifying individual behavioral variation for ecological and evolutionary studies.