What are the consequences of a reduction in second-order consumers in a mixed forest ecosystem?

Second-order consumables are insectivorous animals. A reduction in their number can lead to:
1) an increase in the number of insects;
2) then to a reduction in the number of plants that will be eaten or damaged by insects;
3) reduction in the number of predators (consumers of the third order) that feed on insectivorous animals.

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