The figure below shows a simple aquatic food chain which has been exposed to a pesticide called DDT. Land progressive sequence Aquatic progressive sequence Humans, the ultimate accumulators Milk MeatD Third carnivore (larger fsh) Second carnivore Grazing animals (larger fsh) First carnivore (larger fsh) Herbivore (smaller fsh) First accumulator Grass (algae, water plants) Pollutant in DDT molecular form spray [Source: Adapted from Goudie, A (1993) The Human Impact on the Natural Environment, Blackwell, p.219]

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