Consistent measures of oxidative balance predict survival but not reproduction in a long-distance migrant

Thomas W. Bodey*, Ian R. Cleasby, Jonathan D. Blount, Graham McElwaine, Freydis Vigfusdottir, Stuart Bearhop* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Physiological processes, including those that disrupt oxidative balance, have been proposed as key to understanding fundamental life-history trade-offs. Yet, examination of changes in oxidative balance within wild animals across time, space and major life-history challenges remains uncommon. For example, migration presents substantial physiological challenges for individuals, and data on migratory individuals would provide crucial context for exposing the importance of relationships between oxidative balance and fitness outcomes. Here we examined the consistency of commonly used measures of oxidative balance in longitudinally sampled free-living individuals of a long-lived, long-distance migrant, the Brent goose Branta bernicla hrota over periods of months to years. Although inter-individual and temporal variation in measures of oxidative balance were substantial, we found high consistency in measures of lipid peroxidation and circulating non-enzymatic antioxidants in longitudinally sampled individuals. This suggests the potential for the existence of individual oxidative phenotypes. Given intra-individual consistency, we then examined how these physiological measures relate to survival and reproductive success across all sampled individuals. Surprisingly, lower survival was predicted for individuals with lower levels of damage, with no measured physiological metric associated with reproductive success. Our results demonstrate that snapshot measurements of a consistent measure of oxidative balance can inform our understanding of differences in a key demographic trait. However, the positive relationship between oxidative damage and survival emphasises the need to investigate the relationships between the oxidative system and fitness outcomes in other species undergoing similar physiologically challenging life cycles. This would highlight the extent to which variation in such traits and resource allocation trade-offs is a result of adaptation to different life-history strategies.

Original languageEnglish
Pages (from-to)1872-1882
Number of pages11
JournalJournal of Animal Ecology
Volume89
Issue number8
Early online date28 Apr 2020
DOIs
Publication statusE-pub ahead of print - 28 Apr 2020

Keywords

  • antioxidant
  • fitness
  • life history
  • lipid
  • migrant
  • oxidative stress
  • repeatability
  • waterfowl
  • ASSOCIATIONS
  • MARKERS
  • LESSONS
  • DAMAGE
  • COST
  • EVOLUTION
  • PHYSIOLOGICAL TRAITS
  • INDIVIDUAL QUALITY
  • STRESS
  • BIRDS

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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