Figure 8

(A–D) Box and whisker plots for male (M) v female (F) v unknown sex (U) were generated for ∑PCB and ln ∑PCB concentrations for (A) all stranded HPs (1990–2012); (B) stranded or biopsied SDs (1990–2008); (C) stranded or biopsied BNDs (1990–2012); and (D) stranded or biopsied KWs (1994–2012). The lower line (blue) is the lower PCB toxicity threshold (=9.0 mg/kg lipid, as ∑PCB) for onset of physiological effects in experimental marine mammal studies⁶. The upper line is the highest PCB toxicity threshold (=41.0 mg/kg lipid, as ∑PCB) published for marine mammals based on marked reproductive impairment in ringed seals in the Baltic Sea⁶.