The impact of some chemicals on ecosystems may not be measured directly by the types of toxicity tests discussed above. Some chemicals are known to bioaccumulate either directly from the water (bioconcentrate) or through steps in the food chain (biomagnifiy). The concentrations of chemicals with these characteristics may not be acutely toxic and the classic endpoints of chronic toxicity tests may not show the impacts. The classic example of this type of toxicity is the eggshell thinning from biomagnified chlorinated hydrocarbons that resulted in lowered hatching success for certain bird species, most notably the Bald

Eagle. The concentrations of chlorinated hydrocarbons in the environment did not suggest direct toxicity and this pathway for toxicity was not understood for a long time.

Was this article helpful?

0 0
Project Earth Conservation

Project Earth Conservation

Get All The Support And Guidance You Need To Be A Success At Helping Save The Earth. This Book Is One Of The Most Valuable Resources In The World When It Comes To How To Recycle to Create a Better Future for Our Children.

Get My Free Ebook

Post a comment