Question

Calculate the amount of energy that will be available to the big fish in the following food chain, if 10,000 J of energy is
available to small algae from the sun:
Small algae - Zooplankton Fish Big lish
​

Answer 1

10,000 J of energy is available to small algae, only about 10 J of that energy will be available to the big fish in the food chain.

The amount of energy available to each trophic level in a food chain is typically estimated using the 10% rule, which states that only about 10% of the energy from one level is transferred to the next level. Therefore, we can use this rule to estimate the amount of energy that will be available to each level in the food chain:

Zooplankton: 10% of 10,000 J = 1,000 J

Fish: 10% of 1,000 J = 100 J

Big fish: 10% of 100 J = 10 J

Therefore, if 10,000 J of energy is available to small algae, only about 10 J of that energy will be available to the big fish in the food chain. This illustrates the important role that primary producers, such as small algae, play in ecosystems, as they are ultimately the source of energy for all other organisms in the food chain.

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