Asked in Dragonflies
Why is less 10 percent of the energy the mosquito gets from its food transferred to the dragonfly?
when a dragonfly eats the mosquito, only 10% of the energy that came from your blood is passed to the dragonfly. the rest was used up by the mosquito. then the dragonfly uses energy in catching the mosquito, eating it, and breaking down the large food molecules to simple nutrients. this means only a very small fraction of the energy from your blood is stored by the dragonfly.
Basically, no organism ever collects 100% of the energy stored in the plant or animal it eats.
the insect gets only 10% of the energy stored in a grass, the rodent gets 10% of the energy stored in the insect and so on. From each level to the next 90% of the energy is lost.