Faculty of Science and Engineering, Southern Cross University, Military Road, East Lismore, NSW, 2480, Australia.
Faculty of Science and Engineering, Southern Cross University, Military Road, East Lismore, NSW, 2480, Australia; Department of Primary Industries Fisheries, Port Stephens Fisheries Institute, Taylors Beach Road, Taylors Beach, NSW, 2316, Australia.
Mar Environ Res. 2023 Jul;189:106065. doi: 10.1016/j.marenvres.2023.106065. Epub 2023 Jun 16.
Filter feeding bivalves are useful bioindicators for the detection of biologically available pollutants. We investigated trace metals, metalloids, and pesticides in leaf oyster (Isognomon ephippium) soft tissue and shells and compared them to sediment in five estuaries in northern New South Wales, Australia. Concentrations of Pb, Cr, Mn, Ni, Fe and Al were higher in sediments, whereas Zn, Cd, Ag, Hg, Se and As bioaccumulated in the soft tissue. The amount of Cu, Hg and Ni in the sediment from Tweed and Richmond River estuaries exceeded the Australian national sediment quality guideline values. Only one pesticide, atrazine, was detected in leaf oyster soft tissue. Combinations of six elements in the soft tissue were the best predictors of oyster condition index and shell size, whereas sediment contaminants showed weak relationships. Overall, the bioaccumulation of metals and metalloids increases with leaf oyster size and reduces leaf oyster condition, suggesting these large bivalves are useful bioindicators for pollution in estuarine environments.
滤食性双壳贝类是检测生物可利用污染物的有用生物指标。我们研究了澳大利亚新南威尔士州北部五个河口的贻贝（Isognomon ephippium）软组织和贝壳中的痕量金属、类金属和农药，并将其与沉积物进行了比较。Pb、Cr、Mn、Ni、Fe 和 Al 在沉积物中的浓度较高，而 Zn、Cd、Ag、Hg、Se 和 As 在软组织中生物累积。特威德河和里士满河河口沉积物中的 Cu、Hg 和 Ni 含量超过了澳大利亚国家沉积物质量指导值。贻贝软组织中仅检测到一种农药——阿特拉津。软组织中六种元素的组合是贻贝状况指数和贝壳大小的最佳预测因子，而沉积物污染物则显示出较弱的关系。总体而言，金属和类金属的生物累积随贻贝大小的增加而增加，并降低贻贝的状况，表明这些大型双壳贝类是河口环境中污染的有用生物指标。
