Mercury and other trace elements in a pelagic Arctic marine food web (Northwater Polynya, Baffin Bay)
Mercury and other trace elements in a pelagic Arctic marine food web (Northwater Polynya, Baffin Bay)
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DOI：
10.1016/j.scitotenv.2005.02.043
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发表时间：
2005-12-01
影响因子：
9.8
通讯作者：
Fisk, AT
中科院分区：
文献类型：
--
作者：
Campbell, LM;Norstrom, RJ;Fisk, AT
测定了冰藻、3种浮游动物、混合浮游动物样品、北极鳕鱼（Boreogadus色达）、环斑海豹（Phoca hispida）和8种海鸟的总汞（THg）、甲基汞（MeHg）和其他22种微量元素，以研究这些金属在北极海洋食物网中的营养动力学。所有样本均于1998年在位于巴芬湾埃尔斯米尔岛和格陵兰岛之间的Northwater Polynya（NOW）采集。根据肌肉和肝脏中总汞和甲基汞对数浓度与N-15增量之间的显著正相关关系，发现总汞和甲基汞通过NOW食物网产生生物放大作用。肌肉THg和甲基汞浓度（斜率分别为0.197和0.223）的这些关系的斜率是类似的其他水生食物网的报告。THg和Δ N-15的食物网行为似乎是恒定的，无论生态系统的营养状态（富营养与寡营养），纬度（北极与热带）或盐度（海洋与淡水）。肝脏和肌肉组织中的Rb和肌肉组织中的Zn也被发现通过该食物网生物放大，尽管其速率约为THg的25%。一些元素（镉，铅和镍在肌肉组织和镉和锂在海鸟肝组织）被发现减少营养通过食物网，所示的显着负相关关系与组织特定的三角洲N-15。由于海水的生物浓缩作用，发现一组不同的金属（银、钡、镧、锂、锑、锶、铀和钒）在浮游动物体内的浓度高于海鸟或海洋哺乳动物。剩余的金属（砷，钴，铜，镓，锰，钼和硒在肌肉组织）显示没有关系的营养位置，所示的三角洲N-15值，虽然在肝脏组织中的As显示出显着的生物放大作用的海鸟部分的食物网。(c)2005年由Elsevier B. V.出版
Total mercury (THg), methylmercury (MeHg) and 22 other trace elements were measured in ice algae, three species of zooplankton, mixed zooplankton samples, Arctic cod (Boreogadus saida), ringed seals (Phoca hispida) and eight species of seabirds to examine the trophodynamics of these metals in an Arctic marine food web. All samples were collected in 1998 in the Northwater Polynya (NOW) located between Ellesmere Island and Greenland in Baffin Bay. THg and MeHg were found to biomagnify through the NOW food web, based on significant positive relationships between log THg and log MeHg concentrations vs. delta N-15 in muscle and liver. The slope of these relationships for muscle THg and MeHg concentrations (slope=0.197 and 0.223, respectively) were similar to those reported for other aquatic food webs. The food web behavior of THg and delta N-15 appears constant, regardless of trophic state (eutrophic vs. oligotrophic), latitude (Arctic vs. tropical) or salinity (marine vs. freshwater) of the ecosystem. Rb in both liver and muscle tissue and Zn in muscle tissue were also found to biomagnify through this food web, although at a rate that is approximately 25% of that of THg. A number of elements (Cd, Pb and Ni in muscle tissue and Cd and Li in seabird liver tissue) were found to decrease trophically through the food web, as indicated by significantly negative relationships with tissue-specific delta N-15. A diverse group of metals (Ag, Ba, La, Li, Sb, Sr, U and V) were found to have higher concentrations in zooplankton than seabirds or marine mammals due to bioconcentration from seawater. The remaining metals (As, Co, Cu, Ga, Mn, Mo and Se in muscle tissue) showed no relationship with trophic position, as indicated by delta N-15 values, although As in liver tissue showed significant biomagnification in the seabird portion of the food web. (c) 2005 Published by Elsevier B.V.