Mercury biomagnification in subtropical reservoir fishes of eastern China

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• 作者：N. Roxanna Razavi (1)
  Mingzhi Qu (1)
  Binsong Jin (2)
  Wenwei Ren (3)
  Yuxiang Wang (1)
  Linda M. Campbell (4)
  
• 关键词：Total mercury ; Stable isotopes ; Asian carp ; Food web ; Fishery
• 刊名：Ecotoxicology
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：23
• 期：2
• 页码：133-146
• 全文大小：441 KB
• 作者单位：N. Roxanna Razavi (1)
  Mingzhi Qu (1)
  Binsong Jin (2)
  Wenwei Ren (3)
  Yuxiang Wang (1)
  Linda M. Campbell (4)
  
  1. Department of Biology, Queen’s University, Kingston, ON, K7L 3N6, Canada
  2. Center for Watershed Ecology, Institute of Life Science and Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang University, Nanchang, 330031, Jiangxi, China
  3. Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
  4. Environmental Science, Saint Mary’s University, Halifax, NS, B3H 3C3, Canada
  
• ISSN：1573-3017

文摘

Little is known about mercury (Hg) biomagnification in the subtropics, aquatic systems with high species diversity resulting in complex food webs. High atmospheric Hg emissions and ubiquitous reservoir fisheries may lead to elevated Hg bioaccumulation in Chinese freshwater fishes. However, stocking practices using fast-growing species can result in low fish total Hg (THg) concentrations. Here, we describe Hg transfer within the fish food web of a large subtropical reservoir, Qiandao Hu (Xin’anjiang reservoir) situated in eastern China. We measured food web Hg biomagnification and THg concentrations in 33 species of stocked and wild fishes. Mercury concentrations in most fishes were low, though we also found high Hg concentrations in wild top predators. The food web structure, assessed using stable isotopes of carbon (δ13C) and nitrogen (δ15N), demonstrated a high degree of omnivory and a long food chain. THg concentrations were highly correlated with fish δ15N values. The regression of log10THg against δ15N revealed the overall Hg biomagnification rate was low. This study shows that where long food chains exist in subtropical reservoirs, elevated Hg accumulation in top predators can occur despite a low Hg biomagnification rate.