Fig. 5

Diet of Arctic foxes at Erkuta, southern Yamal. a Percentage of each prey category identified from scat dissection. In 2007 percentage of dry weight was estimated, whereas in 2013 and 2014 percentage of volume was estimated. These estimates can thus not be directly compared. b Proportion of den visits in the years 2010–2016 during which remains of different categories of prey were recorded. Number of visits per year are given in parentheses. c Polygons surrounding the stable isotope signatures of Arctic fox winter fur are shown in different colours for each year (i.e. the year during which the fur was growing; sample sizes in parentheses). Values have been corrected for isotopic discrimination according to Lecomte et al. [49]. Average signatures of main prey groups are shown with standard deviations: Dt, collared lemming; Mg, narrow-sculled vole; Mm and Mr, Middendorff’s vole and red vole; Oz, muskrat; Rt, domestic reindeer; Ll, willow ptarmigan; Lt, mountain hare; wp, waders and passerines; wt, waterfowl