How does the productivity of the producers affect the trophic levels above?
Trophic levels correspond to positions on a food chain. Therefore producers always belong to the first trophic level and decomposers to the last trophic level, consumers that directly eat the producers belong to the second trophic level and so on.
There is no limit regarding the number of trophic levels on a chain, since many orders of consumers can exist.
Read Food Chain.
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