Explain bioaccumulation and biomagnification, using DDT as an example.

You're on a roll — Bioaccumulation is the gradual buildup of a substance, such as a pesticide or other chemical, in an organism's tissues over time. This occurs when the rate of intake of the substance exceeds the rate of its excretion or metabolism. Biomagnification is the increase in concentration of a substance, such as a persistent pollutant, in organisms at successively higher trophic levels in a food chain. This happens because organisms at higher levels consume many organisms from lower levels, accumulating the toxins present in their prey. Example: Consider DDT (dichlorodiphenyltrichloroethane), a persistent pesticide. • Bioaccumulation: A small fish in a contaminated lake ingests DDT from the water and its food. The DDT accumulates in its fatty tissues because it is not easily broken down or excreted. • Biomagnification: A larger fish eats many small fish, accumulating the DDT from all of them, resulting in a higher concentration of DDT in its own tissues than in the small fish. A bird of prey then eats many of these larger fish, leading to an even higher concentration of DDT in the bird, which can cause reproductive issues or death. Two more to go today. Send the next one 📸