Low concentrations of insecticide do not affect leopard frogs, but are lethal to zooplankton. Reduced zooplankton allows phytoplankton to increase, shading out periphyton (the vegetative food source for frog tadpoles), so tadpole growth is limited. Would a decrease in leopard frog population size following addition of the insecticide be due to top- down or bottom up control?
Top-down
Bottom-up
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Low concentrations of insecticide do not affect leopard frogs, but are lethal to zooplankton. Reduce...
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