Write notes: Biomagnification

Explanation

Biomagnification is defined as the increase in concentration of toxicants at successive trophic levels. Mercury and DDT are well known for biological magnification. Toxic materials cannot be metabolised or excreted. Therefore, they get accumulated in an organism and pass on to higher trophic levels, e.g. DDT accumulates in birds and distrubs calcium metabolism which result in thinning of egg shell. This results in decline of bird population.