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CBSE Class 12-science Answered

DDT content in the water of a lake which supplies drinking water to nearby villages is 0.003 ppm. The kingfishers of that area were reported to have 2 ppm of DDT. Why has the concentration of DDT increased in these birds? What harm will this cause to the bird population? Name the phenomenon.
Asked by Topperlearning User | 16 Jun, 2014, 01:22: PM
answered-by-expert Expert Answer

DDT is a toxic substance which gets accumulated in the organisms at each trophic level. As it cannot be metabolised or excreted, the concentration of DDT increases at each trophic level. As kingfishers are present at the highest trophic level, the concentration of DDT is highest in them. The high concentration of DDT disturbs calcium metabolism in birds, causes thinning of eggshell and their premature breaking, and eventually, causes a decline in the bird population. The phenomenon is called biomagnification.

Answered by | 16 Jun, 2014, 03:22: PM
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