铅与镉在被金鱼吸收积累过程中的相互作用  

Interactions of lead and cadmium on uptake and accumulation by gold fish, Carassius auratus

作　　者：刘长发[1,2] 陶澍[1] 龙爱民[1] 曹军[1] 徐福留[1] 

机构地区：[1]北京大学城市与环境学系,大连116023 [2]大连水产学院养殖系,农业部海洋水产增养殖生态学重点开放实验室,北京100871

出　　处：《生态学报》2001年第11期1863-1868,共6页Acta Ecologica Sinica

基　　金：国家杰出青年基金 (4 95 2 5 1 0 2 );辽宁省科学技术基金 (0 0 1 0 5 5 )资助项目

摘　　要：采用混合体系暴露和顺次暴露的方法研究了铅和镉在被金鱼吸收过程中的相互作用。结果表明 ,混合暴露条件下 ,保持镉暴露量不变 ,增加铅的投放量 ,鳃镉与肝镉含量与单独暴露的结果无显著性差异 ,肾镉含量则随铅暴露浓度增加而减少。保持铅浓度不变 ,增加镉的投放量可导致鳃和肾铅含量下降。在镉、铅顺序暴露后则没有观测到鳃。By using simultaneous exposure to Pb and Cd, and exposure to Cd after Pb acclimation,the interaction of the two metals on the branchial uptake and hepatic and renal accumulation in goldfish, Carassius auratus were studied.In the fish exposed to mixtures of constant Cd at 4\^448μmol/L and varied Pb at 0,1\^448,2\^896,4\^344,5\^792,7\^239,and 8\^687 μmol/L in artificial freshwater for ten days,increased branchial uptake and renal accumulation,but not hepatic accumulation,of Pb were observed as Pb concentration went up.The gill uptake and kidney accumulation of Cd were not affected by Pb.The average branchial concentrations (0 026±0 011 mmol/kg fresh weight) and hepatic accumulation of Cd (0 0527±0 0126 mmol Cd/kg fresh weight )in fish exposed to the mixture of constant Cd and varied Pb were not significantly different from those exposed to Cd alone (0 019 mmol Cd/kg fresh weight for gills;0 0395 mmol/kg fresh weight for liver; t \|test,α=0 05).The concentration of Cd accumulated in the kidney tend toward decline.When fish exposed to the mixture of constant Pb at 4 344 μmol/L and varied Cd at 0,0 445,0 890,2 669,4 448,6 227,and 8 006 μmol/L,the branchial uptake and hepatic and renal accumulations of Cd linearly increased with increased concentrations of free ions Cd 2+ in the ambient water.The gill uptake and kidney accumulations of Pb decreased with increase in concentrations of free ions Cd 2+ .However,the accumulation of Pb in the liver (0 0103±0 0059 mmol/kg wet weight)was not influenced by Cd exposure,which was not significant different from that (0 0097mmol Pb/kg fresh weight)of fish exposed to the Pb alone ( t \|test,α=0 05).For the fish exposed to constant Pb at 4\^344 μmol/L for five days after adaptation to Cd exposure at varied concentrations,it was found that uptake of Cd in the gills and accumulations of Pb in the liver and kidney linearly increased with increased concentration of free Cd 2+ in the ambient water.While branchial uptake and hepatic and ren

关 键 词：铅 镉 金鱼 形态 吸收 水相重金属 鱼体积累 

分 类 号：S965.81[农业科学—水产养殖]