Multiple choice question Which statement about Flecker and T

Multiple choice question:

Which statement about Flecker and Townsend’s studies of an aquatic trophic cascade is false?

a). They demonstrated the importance of bottom-up effects.

b). Brown trout were found to cause a significant increase in algae compared with the effects of the native galaxias.

c). Brown trout were found to cause a greater decrease in invertebrate species density than the native galaxias did.

d). Artificial stream channels were used to keep fish in or out.

Solution

ANS:

False statement:

a). They demonstrated the importance of bottom-up effects.

True statements:

b). Brown trout were found to cause a significant increase in algae compared with the effects of the native galaxias.

c). Brown trout were found to cause a greater decrease in invertebrate species density than the native galaxias did.

d). Artificial stream channels were used to keep fish in or out.

Explanation:

Flecker and Townsend’s studies explains top-down model. They states that control comes from the trophic level above.

Ex: Predators control herbivores.