Distribution and Spatial Trends of PCBs in Commercial Scallops from Galician Littoral (NW, Spain). Possible Influence of Biometric Parameters

摘要

Levels and profiles of 10 individual congeners of polychlorinated biphenyls (PCBs) were studied in 3 species of commercial scallops (Pecten maximus, Chlamys varia, and Chlamys opercularis) from several Rias in Galician littoral (NW, Spain). ∑PCBs levels ranged from 2.21 to 41.0 ng/g wet weight for P. maximus, from 13.9 to 24.9 ng/g wet weight for C. varia, and from 1.58 to 24.3 ng/g wet weight for C. opercularis. The possible influence between biometric parameters (lipid content, condition index, and shell size) and PCBs levels were studied using statistical analysis (ANOVA). No relationship between biometric parameters could be established in the studied samples. Multivariate analysis showed there were differences in bioaccumulation of some PCBs congeners. Principal component analysis classifies clearly the 3 studied Rias (Ria de Ferrol, Ria de Arousa, and Ria de Vigo) taking into account PCBs levels found in the shellfish.