Food chain

Food chain.
A food chain is a linear sequence of links in a food wed starting from a species that are called producers in the Web and ends at a species that is called decomposers species in the Web.
A food chain also shows how the organisms are related with each other by the food they eat.
A food chain differs from a food Web, because the complex polyphagous network of feeding relations are aggregated into trophic species and the chain only  follows linear monophagous pathways.
A common metric used to quantify food Web trophic structure is food chain length.
In its simplest form, the length of a chain is the number of links between a trophic consumer and the Base of the Web and the mean chain length of an entire Web is the arithmetic average of the lengths of all chains in a food Web.

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