Beavers are often called "ecosystem keystone engineers" because they create, alter, or destroy habitats. They contribute to river ecosystems by building dams from trees they fell along riverbanks. These dams provide protection and food storage, but they also change the surrounding environment in various ways. If beavers were removed, the loss of their dams could have a significant impact on the surrounding ecosystem.

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Answer 1

Beavers play a vital role in ecosystem dynamics as they shape, reshape, and enhance habitats. Their construction of dams along riverbanks not only provides protection and food storage, but also modifies the environment in numerous ways. Without beavers, the absence of their dams would greatly affect the surrounding ecosystem.