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Bioaccumulation

The accumulation of a substance, such as a toxic chemical, in various tissues of a living organism

Biomagnification

Concentration of impurities as animals are eaten and the impurity is passed through food chains

Biotic

A living component of the environment

Breakwater

Any artificial structure constructed roughly parallel to shore and designed to protect a coastal region from the force of waves

Demersal fish

A bottom-dwelling fish

Dichlorodiphenyltrichloroethane (DDT)

An organochlorine insecticide shown to persist in the environment and accumulate in organisms. Due to the negative environmental effects, DDT was banned in 1971 but still persists in sediments today.

Diurnal

During the day

Ecosystem

A community or communities plus the physical environment, interacting in a large, more or less self-contained area

Ecotone

A spatial transition from one type of ecosystem to another

Ectotherm

An organism that relies mainly on external sources of energy for regulating body temperature

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