Question

use the food web below to help you answer this question.

if the secondary consumer level of a trophic pyramid has 1,000 kcal of energy, how much energy is required by the producers to support this pyramid?
100,000 kcal
1750 kcal
80 kcal

Explanation:

Step1: Energy transfer rule

In a trophic pyramid, energy is transferred at about 10% per level.

Step2: Calculate primary consumer energy

If secondary consumers have 1000 kcal, primary consumers (one level below) have \( \frac{1000}{0.1}=10000 \) kcal.

Step3: Calculate producer energy

Producers (one level below primary consumers) have \( \frac{10000}{0.1}=100000 \) kcal.

Answer:

100,000 kcal