Food webs can be regulated by mostly top-down or mostly bottom-up control.Which is an example of mostly bottom-up control?
A) Australian cactus moths control prickly pear cactus.
B) Coyotes control rodents in a grassland.
C) Lynx control snowshoe hares in the tundra.
D) Sea otters control sea urchins in a kelp forest.
E) Nutrients from upwelling control a coastal ocean ecosystem.

Question

Quizplus · Accepted Answer

Nutrients from upwelling control a coastal ocean ecosystem is an example of mostly bottom-up control, as the availability of nutrients in the water determines the growth of phytoplankton, which then supports the entire food web.

Food Webs Can Be Regulated by Mostly Top-Down or Mostly