An ontogenetic perspective on individual differences

Proceedings. Biological Sciences
Nathan R SennerTheunis Piersma

Abstract

Phenotypic differences among individuals can arise during any stage of life. Although several distinct processes underlying individual differences have been defined and studied (e.g. parental effects, senescence), we lack an explicit, unified perspective for understanding how these processes contribute separately and synergistically to observed variation in functional traits. We propose a conceptual framework based on a developmental view of life-history variation, linking each ontogenetic stage with the types of individual differences originating during that period. In our view, the salient differences among these types are encapsulated by three key criteria: timing of onset, when fitness consequences are realized, and potential for reversibility. To fill a critical gap in this framework, we formulate a new term to refer to individual differences generated during adulthood-reversible state effects. We define these as 'reversible changes in a functional trait resulting from life-history trade-offs during adulthood that affect fitness', highlighting how the adult phenotype can be repeatedly altered in response to environmental variation. Defining individual differences in terms of trade-offs allows explicit predictions regarding...Continue Reading

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Citations

Feb 16, 2016·Psychophysiology·Christopher J Patrick, Greg Hajcak
Jun 17, 2016·The Journal of Animal Ecology·Thomas OudmanJan A van Gils
Oct 26, 2016·The Journal of Animal Ecology·Annette L FayetTim Guilford
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Jan 17, 2020·The New Phytologist·Sofía Ochoa-LópezKarina Boege
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May 3, 2020·The Journal of Animal Ecology·Rose J SwiftNathan R Senner
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Nov 26, 2021·The Journal of Animal Ecology·Mo A VerhoevenTheunis Piersma

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