Fig 1.
Icelandic Arctic fox population estimates and hunting data per region from 1979 to 2018.
Fig 2.
Map of Iceland displaying the different culling locations.
Fig 3.
Isotopic signatures (‰) of foxes from coastal and inland habitats plotted along with their potential prey species corrected for trophic discrimination.
Table 1.
Parameter estimates from generalized additives models assessing the effect of birth year and habitat for (a) carbon isotopes (δ13C) and (b) nitrogen isotopes (δ15N) from bone collagen, along with their corresponding smooth terms values.
Fig 4.
Isotopic signatures in (a) δ13C and (b) δ15N of coastal and inland foxes plotted according to their year of birth.
Lines have been generated with generalized additive models, along with the 95% confidence interval.
Fig 5.
Boxplots representing the proportion of different prey items in the diet of (a) inland and (b) coastal Arctic foxes during 4 different periods.
The box plots are based on the results of the MixSIAR analysis. The median and the confidence interval are also represented.
Fig 6.
Standard ellipses representing the isotopic niche breadths of (a) inland and (b) coastal foxes during four different periods.
Isotopic niches were calculated as standard ellipses areas containing 80% of the data with the “SIBER” R-package.