Does sunlight affect dissolved oxygen?

Oxygen dissolves into water from two sources: the atmosphere and from plants in the water. ... In the presence of sunlight, these produce oxygen through photosynthesis and release this oxygen into the pond water. At night and on very cloudy days, algae and submerged plants remove oxygen from the water for respiration.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

a physical change is being made.