Concentrations of pyrene in gills and digestive glands of mussels exposed to various microplastics treatments: CNTR ¼ control; PE ¼ virgin polyethylene; PS ¼ virgin
polystyrene; PE-PYR ¼ pyrene-contaminated polyethylene; PS-PYR ¼ pyrene-contaminated polystyrene. Data are expressed as ng/g dry weight (mean values ± standard deviation,
n ¼ 5); different letters indicate significant differences between groups of means (post-hoc comparison