Virginia Institute of Marine Science, College of William and Mary, PO Box 1346, Gloucester Point, VA 23062, USA.
Arch Environ Contam Toxicol. 2013 Oct;65(3):510-20. doi: 10.1007/s00244-013-9917-1. Epub 2013 May 29.
Total mercury (THg) and methylmercury (MHg) concentrations and determents of mercury (Hg) accumulation were examined for muscle tissues of 10 finfish from the lower Chesapeake Bay (LCB) and its tributaries. There was no suggestion of potential human harm from Hg due to LCB fish consumption: None of the sampled fish had THg concentrations approaching the United States Environmental Protection Agency human health screening value. Hg concentrations in different fish species generally increased with the increasing stable isotope of nitrogen 15 (δ(15)N) but not the stable isotope of carbon 13 (δ(13)C), thus suggesting that trophic position but not dietary carbon source is a dominant determinant. An MHg biomagnification model was built to estimate a food web magnification factor of approximately 10-fold increase per trophic level. Based on otolith strontium-to-calcium ratios, Atlantic croaker inhabiting less saline waters might accumulate more Hg than those inhabiting more saline waters. The SAS mixed procedure identified significant positive intraspecies relationships between MHg concentration and δ(13)C for summer flounder, weakfish, American eel, Atlantic croaker, and spot.
检测了来自下切萨皮克湾（LCB）及其支流的 10 种鱼类肌肉组织中的总汞（THg）和甲基汞（MHg）浓度以及汞（Hg）积累量。由于食用 LCB 鱼类，没有任何迹象表明 Hg 会对人体造成潜在危害：没有一种采样鱼类的 THg 浓度接近美国环保署的人体健康筛查值。不同鱼类物种的 Hg 浓度通常随着稳定同位素氮 15（δ（15）N）的增加而增加，但与稳定同位素碳 13（δ（13）C）无关，这表明营养位置而不是饮食碳源是一个主要决定因素。建立了一个 MHg 生物放大模型，以估计每营养级约增加 10 倍的食物网放大系数。基于耳石锶与钙的比值，栖息在低盐度水域的大西洋鲷可能比栖息在高盐度水域的大西洋鲷积累更多的 Hg。SAS 混合程序确定了夏季比目鱼、黄鲈、美洲鳗、大西洋鲷和斑点之间 MHg 浓度与 δ（13）C 之间存在显著的正种内关系。
