Fig. 2 in Heavy metals in bones from Harbour Porpoises Phocoena phocoena from the Western Black Sea Coast

Fig. 2. (a) Correlation matrix between heavy metals and age in bone tissue of harbour porpoises (Phocoena phocoena) beached at Black Sea, Bulgaria (significant correlations highlighted in bold). (b) Zink (Zn) concentration in the bones of common harbour porpoises (mg/kg) as a function of age (years).