Increase in concentration of the toxicant at successive trophic levels is known as:

Explanation

Biomagnification, also known as bioamplification or biological magnification, is a process that occurs in ecosystems where certain chemical substances or pollutants become increasingly concentrated in organisms at higher trophic levels in a food chain or food web. Heavy metals and persistent pesticides (e.g., chlorinated hydrocarbons like DDT) pass into food chain and increase in amount per unit weight of organisms with the rise in trophic level due to their accumulation in fat. The phenomenon is called biomagnification/ bioconcentration/biological amplification, e.g., 0.003 parts per billion of DDT in water becomes 0.003 ppm in phytoplankton, 0.04 ppm in zooplankton, 0.5 ppm in clams and small fish, 2.0 ppm in predator fish and 25 ppm in fish eating birds like seagulls.