Skip to main content
Dryad

Urbanization enhances body condition, but not innate immune defenses, in a common waterbird

Data files

Dec 17, 2024 version files 25.81 KB

Abstract

There is a growing body of evidence that urbanization can affect body condition and immune function in wild birds, although these effects may be complex and taxa specific. Here, we assessed the effects of urbanization on body condition (size-corrected body mass and haemoglobin concentration) and innate immune defences (haemolysis-haemagglutination assay, haptoglobin concentration, and bacterial killing assay) in 136 Eurasian coots (Fulica atra) from three urban and three nonurban populations across Poland. We also quantified the heterophil to lymphocyte ratio to control for the potential effect of physiological stress on immune defences. We found that urban coots showed significantly better condition than nonurban ones. At the same time, we found no relationship between any immune defence and urbanization or condition. Thus, our study offers no support for condition-dependent immune function. Our analyses also revealed significant differences between male and female coots in both condition and immune defences; however, we found no evidence for sex-specific responses to urbanization. In conclusion, our study provides correlative evidence that urban habitat enhances condition but not immune defenses in the Eurasian coot.