4 Works

Data from: A hidden cost of migration? Innate immune function versus antioxidant defense

Cas Eikenaar, Caroline Isaksson & Arne Hegemann
Migration is energetically demanding and physiologically challenging. Migrating birds, for example, need to boost their antioxidant defenses to defeat the pro-oxidants produced during high energetic activity. The enhanced antioxidant defense possibly withdraws limited resources (e.g. energy or micronutrients) from other physiological functions, such as immune defense. Such a trade-off might not occur outside the migration seasons or in resident individuals. Here, we investigate if there is a negative relationship between innate immune function and antioxidant...

Data from: Telomere attrition and growth: a life-history framework and case study in common terns

Oscar Vedder, Simon Verhulst, Christina Bauch & Sandra Bouwhuis
The relationship between growth and age-specific telomere length, as a proxy of somatic state, is increasingly investigated, but observed patterns vary and a predictive framework is lacking. We outline expectations based on the assumption that telomere maintenance is costly and argue that individual heterogeneity in resource acquisition is predicted to lead to positive covariance between growth and telomere length. However, canalization of resource allocation to the trait with a larger effect on fitness, rendering that...

Data from: Early mortality saves energy: estimating the energetic cost of excess offspring in a seabird

Oscar Vedder, He Zhang & Sandra Bouwhuis
Offspring are often produced in excess as insurance against stochastic events or unpredictable resources. This strategy may result in high early-life mortality, yet age-specific mortality before offspring independence and its associated costs have rarely been quantified. In this study, we modelled age-specific survival from hatching to fledging using 24 years of data on hatching order (HO), growth and age of mortality of more than 15 000 common tern (Sterna hirundo) chicks. We found that mortality...

Data from: Heterogeneity in individual quality in birds: overall patterns and insights from a study on common terns

Oscar Vedder & Sandra Bouwhuis
While life-history theory predicts a trade-off between reproduction and survival, positive covariance, indicative of heterogeneity in individual quality, is often reported among individuals from natural populations. We review longitudinal studies of wild bird populations that test the relationship between annual reproductive success and lifespan and find the majority to report a positive correlation, while none reports a negative correlation. Heterogeneity in individual quality in resource acquisition, masking resource-based trade-offs, therefore appears to be common in...

Registration Year

  • 2017

Resource Types

  • Dataset


  • Institute of Avian Research
  • University of Groningen
  • Lund University