Fig 1.
Expected distribution of δ66Zn values in animal tissues based on values obtained in modern terrestrial food webs and experimental animals [14,15,16].
Fig 2.
Map showing the location of the site, Zn-Pb deposits (green circles) and the Polaris mine.
The map is adapted from the one of Le Moine et al [29].
Fig 3.
A. Relationship between the Zn concentration and δ66Zn values of cancellous (black circles) and cortical part of bones of walruses (circles) and other mammals (crosses), found in surface (green colors) and subsurface deposits (black colors). All the cancellous bone samples fall on a regression line. B. δ66Zn values of cancellous and cortical fractions of walrus bones. Lines define the average and two standard deviation area of cortical values. Green rectangles frame values for same individuals.
Fig 4.
Cortical bone isotopic values of arctic mammals for C, N, and Zn.
A) δ66Znbioapatite vs. δ13Ccollagen values for four species of marine mammals (B) δ66Znbioapatite vs. δ15Ncollagen values, (C) δ15Ncollage vs. δ13Ccollagen and (D) 3D plot showing that Zn, N and C isotopic compositions of marine mammals enables a distinguishing of the different species. Measurement uncertainties are given by the white boxes.
Table 1.
Descriptive statistics for C, N and Zn stable isotopes.
SD = standard deviation, n = number of samples, TL = trophic level.