EHCCs performed using eight biomarkers (AOXexp, AOXeff, LP, VvL, MLR/MET, VvBAS, CIIR and CIPI) measured in mussels M. galloprovincialis collected after POS in Galicia (a) and the Bay of Biscay (b). For each sample, each colour spot corresponds to a single biomarker, as indicated in the left top legend, and the background colour in each rectangle corresponds to the ecosystem health condition (White sample missing/lost, Green good ecosystem health condition, Yellow tolerable ecosystem health condition, Orange delicate ecosystem health condition, Red bad ecosystem health condition), according to grading criteria indicated in Tables 3 and 4