In an aquatic ecosystem,a secondary carnivore is temporarily excluded and then,after a period of time,is returned.Which one of the following is not an expected top-down effect after it is returned?
A)Primary carnivores become less abundant.
B)Primary productivity increases.
C)Algae decrease.
D)Herbivores become more abundant.
E)Secondary carnivore biomass increases.

Question

Quizplus · Accepted Answer

The exclusion and return of the secondary carnivore would lead to a top-down effect in the ecosystem, where the predator regulates the population of its prey and indirectly affects the other trophic levels. The absence and subsequent return of the secondary carnivore would not directly cause an increase in primary productivity (another trophic level), so option B is not an expected effect. The other options (A, C, D, and E) are all potential outcomes of a top-down effect in the ecosystem.

In an Aquatic Ecosystem,a Secondary Carnivore Is Temporarily Excluded and Then,after