What is the term used to denote increasing concentration of pesticides and other pollutants in the food chain?

The term used to denote the increasing concentration of pesticides and other pollutants in the food chain is "biomagnification." This process occurs when organisms at lower trophic levels absorb these substances, and as they are consumed by higher trophic level predators, the concentration of these pollutants increases. This can lead to harmful effects on wildlife and human health as toxins accumulate in the tissues of animals higher up the food chain.