How do aquatic plants contribute to oxygen levels in water?

Aquatic plants play a crucial role in contributing to oxygen levels in water primarily through the process of photosynthesis, which occurs during daylight hours. During this process, aquatic plants use sunlight, carbon dioxide, and water to produce glucose and oxygen. The oxygen that is released as a byproduct of photosynthesis directly enters the water, increasing the dissolved oxygen levels, which is vital for the survival of fish and other aquatic organisms.

This contribution to oxygen levels typically peaks during the daytime when sunlight is available for photosynthesis. In contrast, during the night, photosynthesis ceases, and the plants engage in respiration, which actually consumes oxygen rather than producing it. This cyclic pattern highlights the importance of aquatic plants in maintaining balanced oxygen levels in aquatic ecosystems.