Explain why there is only one trophic level of producers

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When it is a really dry year in Northern California, the eel River Shrinks down to small pools that become filled with Cyanobacteria JK blue algae. These are photosynetic autotrophs when there are abundant they seem to be the only trophic levels presented. Explain why there is only one trophic level of producers in that ecosystem.

Reference no: EM132158063

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