What are three forest populations that would not survive in a pond ecosystem?

Three forest populations that would likely not survive in a pond ecosystem include deer, which rely on terrestrial vegetation for food, and birds like woodpeckers that depend on tree habitats for nesting and foraging. Additionally, many small mammals, such as squirrels, require trees for shelter and food sources, making them ill-suited for a primarily aquatic environment. These populations are adapted to specific forest conditions that a pond ecosystem cannot provide.