Data from: Within-individual canalization contributes to age-related increases in trait repeatability: a longitudinal experiment in red knots

  • Eva M. A. Kok (NIOZ, Dept Coastal Systems) (Contributor)
  • Joseph B. Burant (Contributor)
  • Anne Dekinga (Contributor)
  • Petra Manche (NIOZ, Dept Coastal Systems) (Contributor)
  • Darren Saintonge (Contributor)
  • Kimberley J. Mathot (Contributor)
  • Theunis Piersma (Contributor)



Abstract: Age-related increases in the repeatable expression of labile phenotypic traits are often assumed to arise from an increase in among-individual variance due to differences in developmental plasticity or by means of state-behaviour feedbacks. However, age-related increases in repeatability could also arise from a decrease in within-individual variance as a result of stabilizing trait expression, i.e. canalization. Here we describe age-related changes in within- and among-individual variance components in two correlated traits, gizzard mass and exploration behavior, in a medium-sized shorebird, the red knot (Calidris canutus). Increased repeatability of gizzard mass came about due to an increase in among-individual variance, unrelated to differences in developmental plasticity, together with decreases in within-individual variance, consistent with canalization. We also found canalization of exploration, but no age-related increase in overall repeatability, which suggests that showing predictable expression of exploration behaviour may be advantageous from a very young age onward. Contrasts between juveniles and adults in the first year after their capture provide support for the idea that environmental conditions play a key role in generating among-individual variation in both gizzard mass and exploration behavior. Our study shows that stabilization of traits occurs under constant conditions: with increased exposure to predictable cues, individuals may become more certain in their assessment of the environment allowing traits to become canalized.,kok et al2019_AmNat data within-indiv canalization datafileData filekok et al2019_AmNat data within-indiv canalization.txtkok et al2019_AmNat within-indiv canalization_RscriptR scriptkok et al2019_AmNat within-indiv canalization.R,
Datum van beschikbaarheid12-apr.-2019
UitgeverUniversity of Groningen

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