OpenSciEd 7.5 Ecosystem Dynamics Practice Test

What is bioaccumulation, and how can it affect higher trophic level populations?

Bioaccumulation is the buildup of substances in an organism over time; higher trophic level organisms can accumulate greater concentrations, leading to health problems. Bioaccumulation is the energy transfer from producers to consumers. Bioaccumulation is the loss of pollutants through excretion. Bioaccumulation only occurs in aquatic systems.

Correct Answer:

Bioaccumulation is the buildup of substances in an organism over time; higher trophic level organisms can accumulate greater concentrations, leading to health problems.

Explanation:

Bioaccumulation is the buildup of substances in an organism over time. When pollutants are persistent and not easily broken down, they accumulate in an individual as it continues to be exposed—through food, water, or contact. In a food web, predators accumulate higher concentrations because they eat many contaminated prey, so the toxin level increases up the chain. This can lead to health problems for higher trophic level organisms, such as impaired growth, reproduction, or survival, which can reduce the size or stability of their populations. Note that this idea is different from simply transferring energy through the ecosystem, and it isn’t limited to aquatic environments—bioaccumulation can occur in terrestrial systems as well.

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