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Do wild-caught urban house sparrows show desensitized stress responses to a novel stressor?

Research output: Contribution to journalA1: Web of Science-articleResearchpeer-review

Authors

  • Noraine Salleh Hudin
  • Aimeric Teyssier
  • Johan Aerts
  • Graham D Fairhurst
  • Diederik Strubbe
  • And 3 others
  • Joël White
  • Liesbeth De Neve
  • Luc Lens

Departments, research groups and services

External Organisations

  • Department of Biological Sciences, Faculty of Science & Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia.
  • Terrestrial Ecology Unit, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, B-9000 Ghent, Belgium.
  • Stress Physiology Research Group, Animal Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Wetenschapspark 1, 8400 Ostend, Belgium.
  • Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, Saskatchewan S7N 5E2 Canada.
  • Laboratoire Evolution & Diversité Biologique, UMR 5174 CNRS-Université Paul Sabatier-IRD-ENSFEA, 118 route de Narbonne, F-31062 Toulouse, France.

Details

Original languageEnglish
Volume7
Issue number6
ISSN2046-6390
Publication statusPublished - 15-Jun-2018

Abstract

While urbanization exposes individuals to novel challenges, urban areas may also constitute stable environments in which seasonal fluctuations are buffered. Baseline and stress-induced plasma corticosterone (cort) levels are often found to be similar in urban and rural populations. Here we aimed to disentangle two possible mechanisms underlying such pattern: (i) urban environments are no more stressful or urban birds have a better ability to habituate to stressors; or (ii) urban birds developed desensitized stress responses. We exposed wild-caught urban and rural house sparrows (Passer domesticus) to combined captivity and diet treatments (urban versus rural diet) and measured corticosterone levels both in natural tail feathers and in regrown homologous ones (cortf). Urban and rural house sparrows showed similar cortf levels in the wild and in response to novel stressors caused by the experiment, supporting the growing notion that urban environments are no more stressful during the non-breeding season than are rural ones. Still, juveniles and males originating from urban populations showed the highest cortf levels in regrown feathers. We did not find evidence that cortf was consistent within individuals across moults. Our study stresses the need for incorporating both intrinsic and environmental factors for the interpretation of variation in cortf between populations.

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