Teja Tscharntke's Studies of the Food Web Associated with Phragmites

question 18

Multiple Choice

Teja Tscharntke's studies of the food web associated with Phragmites reeds revealed that

• A) only a single parasitoid species can persist exploiting a single species of herbivore.
• B) only a single herbivore species can persist attacking a single species of plant.
• C) predation by birds actually protects herbivores, because the birds feed on parasitoid-infested herbivore galls but not uninfested galls.
• D) within local food webs, all interactions tend to be of roughly the same strength.
• E) recognizing variation in interaction strength can greatly simplify the depiction of a food web.

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