Question

The amount of energy in one trophic level of a lake ecosystem is 1000 Joules (J). The next highest trophic level contains 190J. The consumed energy between these trophic levels is 650J and the assimilated energy is 450J.

What are the consumption, assimilation, and net production efficiencies from the lower to the higher trophic level?
a. 15%, 14%, 24%
b. 65%, 45%, 19%
c. 25%, 48%, 42%
d. 65%, 69%, 42%

Answer 1

The consumption efficiency is 65%, assimilation efficiency is 69%, and net production efficiency is 42% from the lower to the higher trophic level in a lake ecosystem.

Step-by-step explanation:

The consumption efficiency is calculated by dividing the consumed energy by the available energy at the lower trophic level and multiplying by 100%. In this case, the consumption efficiency is (650J / 1000J) x 100 = 65%.

The assimilation efficiency is calculated by dividing the assimilated energy by the consumed energy and multiplying by 100%. In this case, the assimilation efficiency is (450J / 650J) x 100 = 69%.

The net production efficiency is calculated by dividing the net production energy by the assimilated energy and multiplying by 100%. In this case, the net production efficiency is (190J / 450J) x 100 = 42%.