Energy moves between producers and consumers/decomposers, and the nutrients from soil or air (minerals, etc.) move into the producers and the consumers. All are linked together, regardless of the biome, but food levels have tropic levels and positions. This starts with a basal species that feeds on no other living creature, then moves up to where something consumes something else in order to survive:
(Yellow line is transfer of energy; red arrow is transfer of nutrients).
Simple Biome Food Web of an Arctic shore area
1. Within our example, the primary producers are the zooplankton and phytoplankton which are consumed in part by every other animal in the food web except the top carnivore. The top consumers are the carnivores (polar bears, orca) that subsist on the top mammal and bird consumers (seals, walruses, penguins)....
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