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Effects of urbanisation on disease prevalence and age structure in blackbird Turdus merula populations

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Karl L. Evans
  • Kevin J. Gaston
  • Stuart P. Sharp
  • Andrew McGowan
  • Michelle Simeoni
  • Ben J. Hatchwell
<mark>Journal publication date</mark>05/2009
Issue number5
Number of pages9
Pages (from-to)774-782
Publication StatusPublished
<mark>Original language</mark>English


Despite increasing interest in urban ecology most attention has focussed on describing changes in assemblage composition and structure along urbanisation gradients, whilst relatively little research has focussed on the mechanisms behind these changes. Ecological theory predicts that alterations in biotic interactions are particularly likely to arise, especially with regard to disease risk. Here, we report on differences in prevalence of avian malaria and tick infection and intensity in 11 paired urban and rural blackbird Turdus merula populations from across the western Palearctic. We find large and consistent reductions in tick prevalence and intensity in urban areas. There are also large reductions in the prevalence of avian malaria in many, but not all, urban areas. The proportion of first year birds in urban populations is significantly lower than that in rural ones, and across the more natural rural sites southerly populations contain fewer first years than northern ones. These patterns are expected to arise if survival rates are higher in urban areas, and are negatively correlated with latitude.