Individual diet specialisation in sparrows is driven by phenotypic plasticity in traits related to trade-offs in animal performance

Karin Maldonado, Seth D. Newsome, Pablo Razeto-Barry, Juan Manuel Ríos, Gabriela Piriz, Pablo Sabat

Research output: Contribution to journalLetterpeer-review

18 Scopus citations

Abstract

Individual diet specialisation (IS) is frequent in many animal taxa and affects population and community dynamics. The niche variation hypothesis (NVH) predicts that broader population niches should exhibit greater IS than populations with narrower niches, and most studies that examine the ecological factors driving IS focus on intraspecific competition. We show that phenotypic plasticity of traits associated with functional trade-offs is an important, but unrecognised mechanism that promotes and maintains IS. We measured nitrogen isotope (δ 15 N) and digestive enzyme plasticity in four populations of sparrows (Zonotrichia capensis) to explore the relationship between IS and digestive plasticity. Our results show that phenotypic plasticity associated with functional trade-offs is related in a nonlinear fashion with the degree of IS and positively with population niche width. These findings are opposite to the NVH and suggest that among individual differences in diet can be maintained via acclimatisation and not necessarily require a genetic component.

Original languageEnglish
Pages (from-to)128-137
Number of pages10
JournalEcology Letters
Volume22
Issue number1
DOIs
StatePublished - Jan 2019
Externally publishedYes

Keywords

  • Assimilation efficiency
  • diet variation
  • digestive efficiency
  • digestive enzymes
  • individual diet specialisation
  • niche breadth
  • niche variation hypothesis
  • niche width
  • phenotypic plasticity
  • stable isotopes
  • trade-offs
  • trophic niche

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