Why are BAF and BCF important for ecological risk assessment?

• A. They measure only external concentrations in the environment.
• B. They determine how pesticides degrade in soil.
• C. They inform internal dose and trophic transfer.
• D. They are used to regulate fishery quotas.

Answer: (C)

Understanding how contaminants move into organisms is crucial because adverse effects occur from the amount that actually accumulates inside, not just what’s present in the environment. Bioconcentration factor shows how efficiently a chemical in water can build up in an aquatic organism, giving a direct read on the internal dose from water exposure. Bioaccumulation factor goes further by including all exposure routes, including diet, to estimate the real body burden organisms carry in nature. These metrics are powerful in ecological risk assessment because they link external environmental concentrations to internal doses and reveal the potential for substances to transfer up the food chain, or biomagnify, in predators.