What is biomagnification?
Explain in detail.
Answers
Biomagnification refers to the condition where the chemical concentration in an organism exceeds the concentration of its food when the major exposure route occurs from the organism’s diet. The term food web biomagnification is used to describe trophic enrichment of contaminants within food webs and refers to the progressive increase in chemical concentrations with increasing animal trophic status. For hydrophobic organic contaminants, the terms biomagnification and food web biomagnification are more narrowly defined to reflect the thermodynamic condition where the chemical potential in an animal exceeds its diet and environment and increases through successive trophic levels. The first empirical data demonstrating food web biomagnification was generated for the chlorinated insecticide dichlorodiphenyldichloroethane in plankton, fish, and birds from Clear Lake, California following multiple applications of the pesticide in the 1950s. Food web biomagnification for dichlorodiphenyltrichloroethane was well established for multiple aquatic systems by the 1960s, although it was not until the 1980s that the thermodynamic criteria of biomagnification was tested and validated using field data. A number of mechanisms have been proposed to account for biomagnification. The gastrointestinal magnification model and recent amendments to this model are outlined as well as alternative, nondietary, mechanisms that can lead to similar and potentially confounding observations of biomagnification.
Answer:
Biomagnification is defined as the accumulation of a particular substance in the body of the organisms at different trophic levels of a food chain. One example of biomagnification is the accumulation of insecticide DDT which gets accumulated in zooplanktons. Small fishes consume these zooplanktons.
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