Selenium accumulation patterns in lotic and lentic aquatic systems.
Selenium accumulation patterns in lotic and lentic aquatic systems.
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潮水和静水水生系统中的硒积累模式。
DOI：
10.1016/j.scitotenv.2005.12.024
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Anderson,KimA
中科院分区：
文献类型：
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作者：
Hillwalker,WendyE;Jepson,PaulC;Anderson,KimA
对美国犹他州单个流域内的流水（流水）和静水（静水）地点的水柱、沉积物和昆虫隔室中的硒 (Se) 浓度进行了 3 年多的测量，并结合选定的物理化学参数。有证据表明昆虫、沉积物和碎屑中的总[Se]浓度处于稳态，但这些浓度与地表水中的浓度之间没有相关性。因此，昆虫硒负荷可能比地表水硒浓度更准确地测量食物网积累风险。在两个水生系统中占据相似环境区划的同一昆虫类群中的稳态硒体负荷揭示了生物体特异性因素对硒转移到更高营养水平的重要性。然而，此外，即使在相似的类群中，昆虫体内的硒负担也比水体系统高出 7 倍，并且特定地点的生物地球化学过程也可能在同一流域内发生的水文地球化学不同水生系统之间硒积累的模式和水平中发挥作用。尽管有机含量与沉积物和碎屑硒浓度之间存在明显的特定地点关系，但该因素并不能解释昆虫和水生生境之间硒积累的差异。如果将碳含量用作特定地点硒积累潜力的预测因子，则需要进一步研究其对食物网硒积累率的影响。
Selenium (Se) concentrations in water column, sediment and insect compartments were measured over 3 years, in conjunction with selected physicochemical parameters, from lotic (flowing water) and lentic (standing water) sites within a single watershed in Utah, USA. There was evidence for steady-state concentrations of total [Se] in the insects, sediment and detritus, while there was no correlation between these concentrations and the concentration in surface water. Insect Se burden may therefore provide a more accurate measurement of food web accumulation risk than surface water Se concentration. The importance of organism-specific factors on Se transfer to higher trophic levels was revealed by the steady-state Se body burden within the same insect taxa occupying similar environmental compartments in both aquatic systems. Additionally, however, insect Se body burdens, even within similar taxa, were up to 7 times greater within the lentic compared with the lotic system, and site-specific biogeochemical processes are also likely to play a role in the pattern and level of Se accumulation between hydrogeochemically different aquatic systems occurring within the same watershed. Though a site-specific relationship was apparent between organic content and sediment and detritus Se concentrations, this factor did not account for insect Se accumulation differences between the lotic and lentic aquatic habitats. If carbon content is to be used as a site-specific predictor of Se accumulation potential, further investigations of it's influence on the food web accumulation rate of Se are required.