What factor increases the potential for biomagnification in aquatic ecosystems?

What factor increases the potential for biomagnification in aquatic ecosystems?

• A. The pollutant is lipophilic and persistent
• B. The pollutant is highly soluble in water and readily degraded
• C. The pollutant is inert
• D. The pollutant is volatile

Answer: (B)

Biomagnification in aquatic systems grows when a pollutant clings to organisms and resists breakdown, so it builds up as you move up the food chain. A substance that is lipophilic (fat-soluble) tends to accumulate in the fatty tissues of organisms rather than staying dissolved in water. When it’s also persistent, it doesn’t break down quickly, so each predator that eats contaminated prey ends up with higher concentrations, and these become even higher in the next predator. That combination—lipophilicity plus persistence—drives the amplification seen in predators higher up the food web. If a pollutant is highly soluble in water and readily degraded, it won’t linger in organisms or the environment for long, so it doesn’t accumulate and transfer efficiently through successive trophic levels. An inert pollutant or a volatile one can also fail to persist in the aquatic system or may leave it, reducing the potential for biomagnification.

Biomagnification in aquatic systems grows when a pollutant clings to organisms and resists breakdown, so it builds up as you move up the food chain. A substance that is lipophilic (fat-soluble) tends to accumulate in the fatty tissues of organisms rather than staying dissolved in water. When it’s also persistent, it doesn’t break down quickly, so each predator that eats contaminated prey ends up with higher concentrations, and these become even higher in the next predator. That combination—lipophilicity plus persistence—drives the amplification seen in predators higher up the food web.

If a pollutant is highly soluble in water and readily degraded, it won’t linger in organisms or the environment for long, so it doesn’t accumulate and transfer efficiently through successive trophic levels. An inert pollutant or a volatile one can also fail to persist in the aquatic system or may leave it, reducing the potential for biomagnification.