Why do rooted aquatic plants grow mainly in the littoral zone?

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lake Lake Ann in North Cascades National Park, Washington, U.S., viewed from the park's Maple Loop Trail. The North Cascades National Park is a large wilderness area that preserves majestic mountain scenery, snowfields, glaciers, and other unique natural features.

Rooted aquatic plants are primarily found in the littoral zone because it is the shallow-water region of a lake where sunlight can penetrate all the way to the bottom.1

This light availability is essential for photosynthesis, allowing rooted plants to thrive in the substrate. In contrast, the deeper zones of a lake—such as the limnetic and profundal zones—either lack the necessary bottom attachment points or do not receive sufficient light to support the growth of rooted vegetation.1