Biomagnification

Definition

Biomagnification is the process where the concentration of toxins increases as they move up the food chain. It occurs because predators consume prey containing toxins, leading to higher toxin levels in organisms at higher trophic levels.

5 Must Know Facts For Your Next Test

1. Biomagnification primarily affects top predators in an ecosystem.
2. Common toxins that biomagnify include mercury, PCBs, and DDT.
3. Biomagnification can lead to harmful effects on wildlife and humans.
4. The process starts with pollutants entering the ecosystem at lower trophic levels, often through contaminated water or soil.
5. Toxins that biomagnify are typically fat-soluble and not easily broken down by organisms.

Review Questions

• What is biomagnification and how does it impact top predators?
• Name three common toxins that are known to biomagnify.
• Why do toxins that biomagnify accumulate in higher concentrations at higher trophic levels?

Related terms

Bioaccumulation: The gradual accumulation of substances, such as pesticides or other chemicals, in an organism.

Trophic Level: Each step in a food chain or food web representing a feeding position.

Ecosystem:

A community of living organisms interacting with their physical environment.