Skip to main content
Article thumbnail
Location of Repository

Either taking it easy or feeling too tired: old Cory's shearwaters display reduced activity levels while at sea

By Paulo Catry, José Pedro Granadeiro, Jaime Ramos, Richard A. Phillips and Paulo Oliveira

Abstract

It has long been known that birds change their behaviour, reproductive performance and survival as they mature, including in the first few years after recruitment into the breeding population. However, and contrasting with the description of patterns of actuarial and reproductive senescence in later years, there are surprisingly few studies documenting changes in behaviour in old individuals. Such studies are important, as birds provide particularly interesting models for studying the biology of senescence. It has been suggested that, unlike mammals, birds may remain physically fit until an advanced age, yet this has limited empirical support. In this paper, we used activity (immersion) loggers to show that old (>26 years) Cory’s Shearwaters Calonectris diomedea are less active when foraging at sea, spend more time resting on the water and have a smaller number of take-offs and landings during darkness, when compared to experienced mid-aged individuals (13–20 years old). Old individuals also tended to have reduced immune response against an experimental challenge using phytohaemagglutinin. These results are in line with observed reductions in activity levels with age in a wide range of non-avian taxa, and may suggest that old seabirds are physically less fit than younger individuals. Alternatively, old birds might simply be more experienced and their reduction in activity might reflect a strategic regulation of investment in different activities. Our study illustrates the potential for gaining insights into avian aging patterns and processes by looking into the behaviour of model organisms. We therefore encourage more research focusing on behavioural parameters that may reflect variations in physical condition or strategic choices, during both the breeding and non-breeding seasons. \u

Publisher: Springer
Year: 2011
DOI identifier: 10.1007/s10336-010-0616-7
OAI identifier: oai:nora.nerc.ac.uk:16627
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://www.springerlink.com/co... (external link)
  • https://doi.org/10.1007/s10336... (external link)
  • https://doi.org/10.1007/s10336... (external link)
  • http://nora.nerc.ac.uk/id/epri... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.