Department of Human Sciences, Innovation and Territory, University of Insubria, Via Valleggio 11, Como, Italy.
Department of Science and High Technology, University of Insubria, Via Valleggio 11, Como, Italy.
Mar Pollut Bull. 2021 Nov;172:112853. doi: 10.1016/j.marpolbul.2021.112853. Epub 2021 Aug 20.
We provided the first multi-species study investigating the presence and organotropism of trace elements in three tissues of 12 elasmobranch species. Shark species showed comparable TE loads, although milk sharks and juvenile scalloped hammerhead sharks exhibited the highest Cd and Hg levels, respectively. Fins accumulated higher levels of Pb, Co, and Cr; muscles higher V, As, and Hg; livers higher Se and Cd levels. The organotropism of TEs calls for cautious when choosing a tissue to be sampled since certain tissues, like fin clips, do not provide reliable surrogate for the internal loads of some TEs. Strong correlations between essential and toxic TEs indicated detoxification mechanisms, while the TMF provided evidence for Hg, As and Se biomagnification along the food-web. Considering the difficulties in assessing elasmobranchs contamination from different areas, the proposed multi-species approach represents a valuable way to estimate the species-specific accumulation and transfer of pollutants in sharks.
我们提供了第一项多物种研究，调查了 12 种鲨鱼三种组织中痕量元素的存在和器官趋向性。鲨鱼物种表现出可比的 TE 负荷，尽管牛鲨和幼年锯齿锤头鲨分别表现出最高的 Cd 和 Hg 水平。鳍积累了更高水平的 Pb、Co 和 Cr；肌肉中 V、As 和 Hg 含量更高；肝脏中 Se 和 Cd 含量更高。痕量元素的器官趋向性要求在选择采样组织时要小心谨慎，因为某些组织，如鳍条，不能为某些痕量元素的内部负荷提供可靠的替代物。必需和有毒痕量元素之间的强相关性表明了解毒机制，而 TMF 则为食物链中 Hg、As 和 Se 的生物放大提供了证据。考虑到评估来自不同地区的鲨鱼污染的困难，所提出的多物种方法代表了一种评估鲨鱼中污染物的物种特异性积累和转移的有价值的方法。
