[Li, Jun
; Zhou, Qiong
; Yuan, Gailing
; He, Xugang
; Xie, Ping] Huazhong Agr Univ, Coll Fisheries, Minist Agr, Key Lab Freshwater Anim Breeding, Wuhan 430070, Peoples R China
; [Li, Jun
; Zhou, Qiong
; Yuan, Gailing
; He, Xugang] Freshwater Aquaculture Collaborat Innovat Ctr Hub, Wuhan 430070, Peoples R China
; [Xie, Ping] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol China, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China
WOS标题词:
Science & Technology
; Life Sciences & Biomedicine
类目[WOS]:
Environmental Sciences
研究领域[WOS]:
Environmental Sciences & Ecology
英文摘要:
Tempo-spatial patterns of mercury bioaccumulation and tropho-dynamics, and the potential for a reservoir effect were evaluated in the Three Gorges Reservoir (TGR, China) from 2011 to 2012, using total mercury concentrations (THg) and stable isotopes (delta C-13 and delta N-15) of food web components (seston, aquatic invertebrates and fish). Hg concentrations in aquatic invertebrates and fish indicated a significant temporal trend associated with regular seasonal water-level manipulation. This includes water level lowering to allow for storage of water during the wet season (summer); a decrease of water levels from September to June providing a setting for flood storage. Hg concentrations in organisms were the highest after flooding. Higher Hg concentrations in fish were observed at the location farthest from the dam. Hg concentrations in water and sediment were correlated. Compared with the reservoirs of United States and Canada, TGR had lower trophic magnification factors (0.046-0.066), that are explained primarily by organic carbon concentrations in sediment, and the effect of "growth dilution". Based on comparison before and after the impoundment of TGR, THg concentration in biota did not display an obvious long-term reservoir effect due to (i) short time since inundation, (ii) regular water discharge associated with water-level regulation, and/or (iii) low organic matter content in the sediment. (C) 2015 Elsevier B.V. All rights reserved.
关键词[WOS]:
FRESH-WATER FISH
; STABLE-ISOTOPE ANALYSIS
; HEAVY-METAL POLLUTION
; TROPHIC POSITION
; NORTHERN MANITOBA
; INORGANIC MERCURY
; METHYLMERCURY
; CANADA
; LAKE
; ACCUMULATION
