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《Journal of Hydroecology》 2019-04
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Bioaccumulation and Health Risk Assessment of the Cyanobacterial Neurotoxin BMAA in Guanqiao Lake,Wuhan

CHEN Yong-mei;ZHAO Yi-jun;CHEN Mo;LIU Wei;CHEN Hui-yu;ZHANG Ze-hui;GAO Jian;TIAN Xiao-fang;JIAO Yi-ying;Wuhan Vocational College of Software and Engineering,Wuhan Radio &TV University;Key Laboratory of Ecological Remediation for Lakes and Rivers and Algal Utilization of Hubei Province;Faculty of Resources and Environmental Science,Hubei University;  
N-methylamino-L-alanine(BMAA)is a newly identified neurotoxin produced during cyanobacterial blooms,and bioaccumulation of BMAA can lead to food chain amplification.Guanqiao Lake,an area of Donghu Lake in Wuhan,is a typical eutrophic urban lake with frequent algal blooms.In this study,we investigated the distribution of BMAA in Guanqiao Lake during a cyanobacterial bloom in July,2017.Free BMAA and protein-bound BMAA in the water column and BMAA extracted from cyanobacteria and fish samples were analyzed by HPLC-MS/MS.The study provides scientific data to support environmental management of urban lakes and early warning when human health is threatened by cyanotoxins.FreeBMAA in the water column was below the detection limit(0.05μg/L),but BMAA was detected in microcystis(0.04±0.002μg/g,dw)and fish(0.32±0.317μg/g,dw).Furthermore,determination of BMAA in fish species occupying different trophic levels indicates that BMAA can be bioamplified as it moves up the food chain.The BMAA concentration in Rhodeus sinensis,Carassius auratus,Cyprinus carpio,Hypophthalmichthys molitrix,Aristichthys nobilis and Parabramis pekinensis were,respectively,(0.243±0.205)μg/g,(126±0.04)μg/g,(0.613±0.120)μg/g,(0.028±0.018)μg/g,(0.039±0.021)μg/g and(0.879±0.243)μg/g.The BMAA concentrations in Cyprinus carpio and Parabramis pekinensis were significantly higher than in the other species(P0.05).According to WHO drinking water guidelines,the EDI(Estimated Daily Intake)values of BMAA from fish was 1.015μg/(kg·d),considerably lower than the estimated TDI(Tolerable Daily Intake)value of 0.5 mg/(kg·d).This indicates that the health risk of consuming fish from Guanqiao Lake is relatively low and not likely cause acute toxicity in humans.However,due to the potential for a chronic response,the risk of BMAA accumulation should not be ignored.Therefore,we recommend long-term monitoring of BMAA in fish from Donghu Lake by the relevant regulatory agencies.
【Fund】: 武汉市科技局项目(2015061701011615);; 河湖生态修复及藻类利用湖北省重点实验室开放基金(HHKF201507);; 国家重点研发计划(2016YFC0401702);; 国家自然科学基金面上项目(31670367)
【CateGory Index】: X52;X820.4
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