The rule says: “no more than 10% of the energy comes from each previous trophic level to the next.”

The rule says: “no more than 10% of the energy comes from each previous trophic level to the next.” Using this rule, calculate the amount of energy (in kJ) that goes to the level of II order consumers with a net annual primary production of the ecosystem of 2,000 kJ.

food chain: producers → 1st order consumers → 2nd order consumers
Producers – net annual primary production of the ecosystem = 2000 kJ
I order consumables – 2000: 10 = 200 kJ
Consumable II order 200: 10 = 20 kJ

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