Department of Animal Biology, Institute of Biodiversity (IRBIO), University of Barcelona, Av. Diagonal, 643, Barcelona, Spain.
Department of Animal Biology, Institute of Biodiversity (IRBIO), University of Barcelona, Av. Diagonal, 643, Barcelona, Spain.
Sci Total Environ. 2016 Mar 1;545-546:414-23. doi: 10.1016/j.scitotenv.2015.12.046. Epub 2015 Dec 31.
The Sundarbans forest is the largest and one of the most diverse and productive mangrove ecosystems in the world. Located at the northern shoreline of the Bay of Bengal in the Indian Ocean and straddling India and Bangladesh, the mangrove forest is the result of three primary river systems that originate further north and northwest. During recent decades, the Sundarbans have been subject to increasing pollution by trace elements caused by the progressive industrialization and urbanization of the basins of these three rivers. As a consequence, animals and plants dwelling downstream in the mangroves are exposed to these pollutants in varying degrees, and may potentially affect human health when consumed. The aim of the present study was to analyse the concentrations of seven trace elements (Zn, Cu, Cr, Hg, Pb, Cd and As) in 14 different animal and plant species collected in the Sundarbans in Bangladesh to study their transfer through the food web and to determine whether their levels in edible species are acceptable for human consumption. δ(15)N values were used as a proxy of the trophic level. A decrease in Zn, Cu, Pb and Cd levels was observed with increasing trophic position. Trace element concentrations measured in all organisms were, in general, lower than the concentrations obtained in other field studies conducted in the same region. When examined with respect to accepted international standards, the concentrations observed in fish and crustaceans were generally found to be safe for human consumption. However, the levels of Zn in Scylla serrata and Cr and Cd in Harpadon nehereus exceeded the proposed health advisory levels and may be of concern for human health.
孙德尔本斯森林是世界上最大、最多样化和生产力最高的红树林生态系统之一。它位于印度洋孟加拉湾的北海岸线上，横跨印度和孟加拉国，是三条主要河流系统的结果，这些河流系统发源于更北和西北的地区。在最近几十年，由于这三条河流的流域逐渐工业化和城市化，孙德尔本斯受到了越来越多的微量元素污染。因此，生活在红树林下游的动植物不同程度地暴露于这些污染物中，当被人类食用时，可能会对人类健康产生潜在影响。本研究的目的是分析在孟加拉国孙德尔本斯采集的 14 种不同动植物物种中 7 种微量元素（Zn、Cu、Cr、Hg、Pb、Cd 和 As）的浓度，以研究它们在食物网中的传递，并确定食用物种中的水平是否可接受人类食用。δ（15）N 值被用作营养水平的替代物。随着营养水平的提高，Zn、Cu、Pb 和 Cd 的水平呈下降趋势。所有生物中测量的微量元素浓度通常低于在同一地区进行的其他现场研究中获得的浓度。根据国际公认标准进行检查时，鱼类和甲壳类动物中的浓度通常被认为是安全可食用的。然而，锯缘青蟹中的 Zn 水平以及哈氏滨蟹中的 Cr 和 Cd 水平超过了建议的健康咨询水平，可能对人类健康构成关注。
