Five hundred minnows consume 1000 kilograms of algae over a four-month period. Five bass consume these 500 minnows over a period of two weeks. Louisa catches and eats the bass. How much of the original 1000 kilograms of algae would you expect to become the biomass of Louisa?
a. 1
b. 10
c. 100
d. 1000
e. 10,000
A; Using the rule of thumb that 90 % of the biomass is lost at each trophic level: The minnow consumes 1000 kg, but only 100 become minnow biomass. The bass eats the minnows and 10 kg becomes bass. Louisa eats the bass and 10 percent becomes Louisa (1kg).
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