Heavy metal spatial variation, bioaccumulation, and risk assessment of Zostera japonica habitat in the Yellow River Estuary, China.

摘要: Globally, seagrass habitats are decreasing due to both natural and environmental contaminations by human activities, including heavy metal pollution. To expand the global detection network, this study reports spatial distributions of Zostera japonica in Yellow River Estuary, China. In addition, concentrations Z. tissue, sediment, surface seawater were analyzed determine bioaccumulation consequent ecological risk effects metals. It was found that metals 1.00-2.03 times higher seagrass-rooted sediment than adjacent non-seagrass except for Mn (with a factor 0.99). Pb Hg sediments exceeded background values more other metals, factors 1.74 1.24, respectively. Metal surrounding 2.60-4.63 at sites sites, (factor 0.97). much tissues (e.g., bioconcentration Cd is 30.95). water may cause greatest adverse reactions among aquatic organisms, while As, Cr, Hg, Cu occasionally negative effects. showed above-ground tissues. Among recent studies seagrasses from parts world, similar results present study, but concentration studies. conclusion, As environment potential risks