John Wiley & Sons, Ltd.

Low temperatures enhance the toxicity of Cu and Cd to Enchytraeus crypticus through different mechanisms

0
Knowledge about how toxicity changes with temperature is important for determining the size of safety factors used when extrapolating from standard laboratory conditions to variable field scenarios. In this study we evaluated the toxicity of Cu and Cd to the potworm Enchytraeus crypticus at six temperatures in the range of 11–25°C. For both metals, reproductive toxicity decreased approximately 2.5‐fold with increasing temperature. This is contrary to what has been found for most other studies. Measurements of the bioavailable fraction of the metals in the soils and the internal metal concentrations in the worms over time showed that the major cause for the change in toxicity with temperature for Cu was the ability of the worms to regulate internal concentration at high temperatures. Uptake of Cd increased with time at all temperatures and with higher rates at high temperatures. Hence, the lower toxicity of Cd is proposed to be due to the E. crypticus being more efficient at immobilising Cd and/or repairing damages at high compared to low temperatures. The study concludes that no consistent relationship between metal toxicity and temperature across species can be made, but that the metabolic dependence of the species in terms of regulating metal uptake, excretion, immobilisation, damage and repair processes will be crucial factors in determining species susceptibility to metals at varying temperatures. Environ Toxicol Chem © 2013 SETAC

Customer comments

No comments were found for Low temperatures enhance the toxicity of Cu and Cd to Enchytraeus crypticus through different mechanisms. Be the first to comment!