重金属在小球藻-菲律宾蛤仔食物链上的传递与累积

Transmission and accumulation of heavy metals in Chlorella-Ruditapes philippinarum food chain

中文关键词: 小球藻  菲律宾蛤仔  重金属  食物链  富集

英文关键词: Chlorella  Ruditapes philippinarum  Heavy metal  Food chain  Accumulation

中文摘要:

      在受控实验条件下，模拟了重金属铜、铅、镉在海水-小球藻-菲律宾蛤仔食物链中的累积和传递，测定了小球藻、菲律宾蛤仔对铜、铅、镉的富集系数以及铜、铅、镉在小球藻-菲律宾蛤仔食物链上的传递系数。结果显示，随着海水中重金属浓度的增加，小球藻、菲律宾蛤仔体内的重金属含量逐渐增大，小球藻对铜、铅、镉离子的富集系数变化范围分别为1 626~3 161、3 295~7 799、5 438~9 313；蛤仔对Cu、Pb、Cd的富集系数变化范围分别为364~821、1 089~1 936、245~736；生物传递因子变化范围分别为0.22~0.26、0.25~0.46、0.03~0.14。在本实验条件下，小球藻对Cu、Pb、Cd的富集系数远大于菲律宾蛤仔，Cu、Pb、Cd在小球藻-菲律宾蛤仔食物链上没有明显的生物放大效应。

英文摘要:

      Accumulation and transmission of heavy metals (Cu, Pb, and Cd) in Chlorella-Ruditapes philippinarum food chain was simulated under controlled conditions, and bioconcentration factors (BCF) of Cu, Pb, and Cd in Chlorella and R. philippinarum and biomagnification factors (BMF) of Cu, Pb,and Cd in Chlorella-R. philippinarum food chain were determined. The results showed that the concentrations of heavy metals in Chlorella and R. philippinarum increased with their concentrations in seawater. The BCFs of Cu, Pb,and Cd in Chlorella varied from 1 626 to 3 161, 3 295 to 7 799, and 5 438 to 9 313, respectively. The BCFs of Cu, Pb,and Cd in R. philippinarum varied from 364 to 821, 1 089 to 1 936, and 245 to736, respectively. The BMFs of Cu, Pb,and Cd in the Chlorella-R. philippinarum food chain varied from 0.22 to 0.26, 0.25 to 0.46, and 0.03 to 0.14, respectively. Under the experimental conditions, the BCFs of Cu, Pb, and Cd by Chlorella were much larger than by R. philippinarum and the BMF showed that there was no obvious biomagnification effect in Chlorella-R. philippinarum food chain.