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首页> 外文期刊>Environmental toxicology and chemistry >METAL TROPHIC TRANSFER FROM ALGAE TO CLADOCERANS AND THE RELATIVE IMPORTANCE OF DIETARY METAL EXPOSURE
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METAL TROPHIC TRANSFER FROM ALGAE TO CLADOCERANS AND THE RELATIVE IMPORTANCE OF DIETARY METAL EXPOSURE

机译：藻类向克拉多菌的金属营养转移及饮食中金属暴露的相对重要性

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摘要

We initially investigated effects and uptake of cadmium and copper on Pseudokirchneriella subcapitata (primary producer; formerly known as Selenastrum capricornutum). Our major efforts focused on the effects of metal-laden (i.e., Cd, Cu) P. subcapitata when used to provide dietary metal exposure to Ceriodaphnia dubia (primary consumer). Major test endpoints included feeding rate, survival, and reproduction. Metal body burden in C. dubia increased dose dependently at dietary exposure concentrations of 0.6 μg/g algal dry weight or less for cadmium and 74.7 μg/g algal dry weight or less for copper. However, it decreased sharply when dietary concentrations exceeded 0.6 μg/g algal dry weight for cadmium and 74.7 μg/g algal dry weight copper. Both dietary cadmium and copper affected all the major test endpoints. Whereas reproduction was observed to be the most sensitive endpoint, survival was observed to be the least sensitive endpoint. These results demonstrated the potential importance of dietary exposure for consideration in metal regulations or risk assessment.
机译：我们最初调查了镉和铜对次生假单胞菌（主要生产者；前身为硒硒）的影响和吸收。我们的主要工作集中在负载金属（即Cd，Cu）的P. subcapitata的影响上，这些食物用于提供膳食金属暴露于Ceriodaphnia dubia（主要消费者）中。主要的试验终点包括摄食率，存活率和繁殖率。膳食中的镉暴露量为0.6μg/ g藻干重或更低，而镉的饮食暴露浓度为74.7μg/ g藻干重或更低，铜假蝇假单胞菌的金属体重增加依赖于剂量。但是，当膳食中镉的含量超过0.6μg/ g的藻干重和74.7μg/ g的藻干重的铜时，其急剧下降。膳食镉和铜均影响所有主要测试终点。观察到生殖是最敏感的终点，而观察到存活是最不敏感的终点。这些结果表明，饮食接触对于金属法规或风险评估的潜在重要性。

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