If a pond exhibits excessive brown algae growth, which color might it appear?

When a pond experiences excessive brown algae growth, it is characterized by a notable increase in specific types of phytoplankton, particularly diatoms or other brown algae species. As these organisms proliferate, they can significantly change the color of the pond's water. The presence of brown algae typically imparts a tan or brown hue to the water, making it appear murky and altering its overall appearance.

This change in color occurs because the pigments found in brown algae, such as fucoxanthin, dominate in larger numbers, thus masking the blue or green shades that might be observed under normal conditions. The coloration can affect not only the aesthetic quality of the water but may also influence the ecological balance and oxygen levels in the pond, leading to further complications in the aquatic ecosystem.