A food web, according to the U.S. Geological Survey, is "who eats what." Also called the food chain, the food web describes the series of relationships that occur between predators and prey in an ecosystem. You are a member of the food web if you eat animals that have eaten other animals or plants. Because life forms in a food web depend on one another, the extinction of one species can spell trouble for other life in the ecosystem.
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It can cause extinction of animals .In a food web  producers are food to primary consumers.if primary consumers and little carnivores are increased in a food web .A certain group of them will eat all the plants there will be no left food for others and they will die.This will create less food for apex predators and tertiary consumers.As a result they will die
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