Question

Which of the following is NOT a reason that only ~10-15% of the energy at one trophic level is transferred to the next trophic level in a wetland foodweb?
Some of the energy is lost as heat as it is transferred to a higher trophic level
Some of the energy is not consumed
Some of the energy is transferred back to a lower trophic level
Some of the energy is not digested and absorbed

Answer 1

A portion of the energy is returned to a lower trophic level. About 10% of the energy available at one trophic level is typically transferred to the one below it. This is true because most of the energy is consumed by the routine actions required to maintain homeostasis, while the remainder is simply lost.

10% of the energy is transferred from one level to the next. Some information is not used. Only a tiny portion of the organic carbon molecules consumed are absorbed; the majority of food is used as an energy source. Each trophic level's energy content diminishes as it progresses through an ecosystem. At any given trophic level, only 10% of the energy is transmitted to the next level is consumed ; the remaining 90% is primarily wasted as heat during metabolic activities.

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