Applied Ecophysiology Program, Basic Sciences Department, Institute of Ecology and Sustainable Development-INEDES, National University of Luján, CC 221, B6700ZBA Luján, Argentina.
Bull Environ Contam Toxicol. 2013 Jul;91(1):49-54. doi: 10.1007/s00128-013-0999-2. Epub 2013 May 1.
The poeciliid Cnesterodon decemmaculatus is one of the native species of southern South America recently recommended for use as a test species in biomonitoring. Therefore, it is important to characterize its responses to stress conditions caused by pollution. The aim of this work was to determine the toxicity of the reference toxicant cadmium (Cd) and to evaluate the lethality response of juveniles of C. decemmaculatus exposed to an environmental sample with a high degree of pollution (Luján River, Buenos Aires, Argentina). The LC₅₀ values at 24 and 96 h were 6.00 and 2.27 mg Cd/L, respectively. The uptake of Cd was significantly greater in the first 24 h in relation to the total time of exposure in the bioassay. The toxicity of the water was in agreement with the level of contamination. A Cd contaminant pulse exerted an important additive effect on the toxicity of the environmental sample. The results provide information regarding the sensitivity of a native species to be used as a test organism in environmental monitoring.
孔雀鱼是新近被推荐用于生物监测的南美南部本地物种之一。因此，描述其对污染引起的应激条件的反应非常重要。本工作旨在测定参考毒物镉（Cd）的毒性，并评估暴露于高度污染的环境样品（阿根廷布宜诺斯艾利斯省卢汉河）中的孔雀鱼幼鱼的致死反应。24 和 96 h 的 LC₅₀ 值分别为 6.00 和 2.27 mg Cd/L。与生物测定中的总暴露时间相比，在最初的 24 小时内，Cd 的吸收量显著增加。水的毒性与污染水平一致。Cd 污染物脉冲对环境样品的毒性表现出重要的附加效应。这些结果为将本地物种作为环境监测的测试生物提供了有关其对毒物敏感性的信息。
