What are the most common methods of algae control in lakes and reservoirs?

While it may seem reasonable to consider rapid changes in water quality from natural and human activity as a form of algae control, this approach does not effectively manage algae populations directly nor sustainably. Rapid changes in water quality can inadvertently lead to conditions that favor algal blooms, rather than control them. This option overlooks the intent of algae control methods focused on intervention strategies.

The most effective and commonly utilized methods for controlling algae in lakes and reservoirs include chemical treatments, increased aeration, and the introduction of predatory species. Adding chemical treatments, such as algaecides, directly combats algae growth and can reduce existing algal blooms. Increased aeration can improve oxygen levels in the water and help to maintain a balanced ecosystem, thereby limiting conditions conducive to excessive algae growth. Utilizing predatory species can also aid in natural control of algae populations by creating a more balanced aquatic food web.

In summary, while the natural occurrence of rapid changes in water quality may influence algae growth, it is not a reliable or strategic method of control. Effective algae management typically relies on direct interventions designed to maintain water quality and ecological balance.