Impact of extreme metal contamination at the supra-individual level in a contaminated bay ecosystem
Impact of extreme metal contamination at the supra-individual level in a contaminated bay ecosystem
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受污染海湾生态系统中极端金属污染对超个体水平的影响
DOI：
10.1016/j.scitotenv.2016.03.047
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发表时间：
2016
影响因子：
9.8
通讯作者：
Xuefa Shi
中科院分区：
文献类型：
--
作者：
Bin Wu;Xuegang Li;Jinming Song;Limin Hu;Xuefa Shi
人为应激源影响全球环境，对生物体和人类的健康产生不利影响。基于2010年锦州湾的现场调查，从超个体水平评价重金属污染的生态后果。化学结果显示，JZB沉积物中的金属浓度很高，是当地地球化学背景的129倍。此外，所测得的金属表现出相当高的毒性潜力所示的沉积物质量准则（SQG）。结果表明，五里河口附近海域的总毒性发生率> 70%。生物监测显示，116个个体分布在仅仅6个物种，其中4个是多毛类，在33%的采样点。因此，整个区域受损的群落结构中几乎没有底栖生物，这与极端金属污染相一致。此外，沉积物质量评估，在证据权重框架，表明整个JZB的沉积物是中度至严重受损，特别是在五里河口附近。通过综合目前和以往的化学-生物监测活动，建立了化学压力和底栖生物受体之间可能的因果关系。我们还发现，水动力，沉积物来源，以及金属的地球化学特征（除了金属的来源）是负责金属的地球化学分布在JZB。总体研究结果的意义在于，在群落水平上观察到的有害反应可能与JZB沉积物中的极端化学胁迫有关。
Anthropogenic stressors impact the global environment and adversely affect the health of organisms and humans. This study was designed as an attempt to evaluate the ecological consequences of severe metal contamination at the supra-individual level based on a field investigation in Jinzhou Bay (JZB), North China in 2010. The chemical results showed high concentrations of metals in the sediment of JZB that were ~ 129 times greater than the local geochemical background. Furthermore, the measured metals exhibited considerably high toxicity potential indicated by sediment quality guidelines (SQGs). The mean SQGs quotients suggested the overall toxicity incidence was > 70% in locations neighboring the Wulihe River mouth. Biomonitoring revealed 116 individuals distributed among a mere 6 species, 4 of which were polychaetes, at 33% of the sampling sites. Thus, few benthic organisms were present in the damaged community structures across the region, which was consistent with the extreme metal contamination. Moreover, the sediment quality assessment, in a weight of evidence framework, demonstrated that the sediment throughout the entire JZB was moderately to severely impaired, especially in the vicinity of the Wulihe River mouth. By synthesizing the present and previous chemical-biological monitoring campaigns, a possible cause-effect relationship between chemical stressors and benthic receptors was established. We also found that the hydrodynamics, sediment sources, and geochemical characteristics of the metals (in addition to the sources of the metals) were responsible for the geochemical distribution of metals in JZB. The significance of the overall finding is that the deleterious responses observed at the community level may possibly be linked to the extreme chemical stress in the sediment of JZB.