The researchers studied how different plants and algae in the River Nile are affected by the environment. They looked at plants like Myriophyllum spicatum and Ceratophyllum demersum, and found that the types of algae living on them changed depending on the season. In the hot season, there were more different types of algae. They also found that certain types of algae were more common on specific plants. Overall, the environment and the plants themselves play a big role in determining which algae grow on them.