What is biomagnification in an aquatic food chain?

What is biomagnification in an aquatic food chain?

• A. Mercury concentration increases at higher trophic levels
• B. Mercury concentration decreases at higher levels
• C. Mercury is eliminated by top predators
• D. Mercury remains constant

Answer: (A)

Biomagnification describes how a contaminant like mercury becomes more concentrated as you move up the aquatic food chain. Mercury enters the ecosystem, is taken up by small organisms, and remains in their bodies. When those organisms are eaten, the mercury transfers to the predators, and because it is not easily excreted, each step up the chain adds more to the predator’s body burden. This leads to the highest concentrations in top predators, which is why larger fish and apex predators often have the most mercury. The idea that mercury would decrease, be eliminated by top predators, or remain constant contradicts this buildup process, so those options don’t fit.

Biomagnification describes how a contaminant like mercury becomes more concentrated as you move up the aquatic food chain. Mercury enters the ecosystem, is taken up by small organisms, and remains in their bodies. When those organisms are eaten, the mercury transfers to the predators, and because it is not easily excreted, each step up the chain adds more to the predator’s body burden. This leads to the highest concentrations in top predators, which is why larger fish and apex predators often have the most mercury. The idea that mercury would decrease, be eliminated by top predators, or remain constant contradicts this buildup process, so those options don’t fit.