The seasonal bioaccumulation of trace metals, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and organochlorinated pesticides (OCPs) in sea snail (Hexaplex trunculus) and sea cucumber (Holothuria polii) from Mar Menor lagoon were characterised. The highest concentrations of p,p'-DDE were detected in the central and south part of Mar Menor lagoon. However, the highest concentrations of metals in sea snail and holothurians were detected in the influence area of El Beal wadi. Biomagnification factors (BMF) in sea snail from cockle (sea snail-cockle concentration ratio) were higher than 5 for metal and organochlorinated compounds. However, similar concentrations were observed in both species for PAHs due to gastropods capability of metabolising these pollutants. Consequently, sea snail is proposed as a sentinel for trace metals, PCBs and OCPs in the coastal lagoons, not only due to its bioaccumulation and biomagnification capacity but also the easy sampling and amply distribution in many coastal areas.

海蜗牛（Hexaplex trunculus）和海参（Holothuria polii）中的微量金属，多环芳烃（PAHs），多氯联苯（PCBs）和有机氯农药（OCPs）的季节性生物富集）来自Mar Menor泻湖。在Mar Menor泻湖的中部和南部发现了最高浓度的p，p'-DDE。但是，在比尔河谷的影响地区发现了海蜗牛和全人类中金属的最高浓度。对于金属和有机氯化合物，海蛤中海蜗牛的生物放大系数（BFM）高于5。然而，由于腹足类动物代谢这些污染物的能力，在两个物种中对于PAHs观察到相似的浓度。因此，人们提出将海蜗牛作为沿海泻湖中痕量金属，PCBs和OCP的前哨，这不仅是由于其生物积累和生物放大能力，而且在许多沿海地区都易于采样和充分分布。