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When the tertiary level of a food web is decreased, it can lead to an increase in the populations of secondary consumers, as there is less predation on them. This, in turn, can result in overconsumption of primary consumers, potentially leading to their decline. The entire ecosystem can become unbalanced, affecting biodiversity and altering the availability of resources within the food web. Overall, the decrease at the tertiary level can have cascading effects throughout the entire ecosystem.

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