DDT

A specific example of a biological interaction with environmental cheimcals would be DDT. The process of DDT is pretty simple. A foreign substance to an environment works its way up the food chain and as it moves up it becomes for conentrate and more harmful to the larger speices. For example a bottom feeder in a lake or pond would eat the foreign substance then a small fish would eat the bottom feeder. Next a larger fish would eat the small fish and after that a bird would eat the larger fish. As the foreign substance makes its way into all of these organisms it would become more and more concentrated and leaving bigger damage. It would kill most of the birds that eat the infected fish.
         When the effects of DDT were first seen in the 1950s it was among robins in the United States. Toxic spray to control beetles was ingested by worms and the worms were then eaten by the robins and killed large amounts of robins in that area.