Chesson’s electivity indices for habitat types of the grey partridge in the years 2001, 2009 and 2017.

Chesson’s electivity indices and their distributions of 1500 bootstrap resamples (mean and 95% confidence interval) for habitat types of grey partridges based on the annual land cover map. Grey partridge individuals were mapped in Vienna district, Austria, during (a) 2001 (n = 43), (b) 2009 (n = 24), and (c) 2017 (n = 28). Not significant results cross the vertical line at zero. See text for statistical details.