pesticides added to field is seen in increased amount in the crop and in the birds that feed them. wht is this phenomenon called?

The gradual increase in the concentration of  non biodegradable toxins with increasing trophic levels is known as Biomagnification.
 
Water runoff into lakes/rivers from Agricultural fields 
Pesticide in water bodies
Increase in Concentration of pesticides in Small Fishes
Increase in Concentration of pesticides in Large fishes feeding on small fishes
Ultimately highest concentration of toxins seen in birds feeding on these large fishes

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The phenomenon is called Bio Magnification
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