Fig. 2.

Box and whiskers plots indicating the median, the 25th and 75th percentiles and range of the concentrations of heavy metals and trace elements (open circles) in relation to tissue type (f=fur, b=blood). Statistically significant differences between heavy metal and trace element concentrations in fur and blood are indicated as follows: *= P < 0.05, **=P < 0.005, and ***P < 0.0005. Wilcoxon tests were used to compare Al, Ca, V, Cr, Mn, Ni, Rb and Sr; ANOVAs were used to compare K, Zn, Se; t-tests assuming unequal variances were used to compare B, Co, As, Cd, Sb, Hg and Pb and t-tests assuming equal variances were used to compare Fe, Cu and Sn