High levels of nutrients in water typically result in which of the following?

High levels of nutrients in water, particularly nitrogen and phosphorus, often lead to an increase in filamentous algae growth. These nutrients serve as fertilizers for algae, resulting in algal blooms, which can take the form of thick mats of filamentous algae that can cover the water's surface. This rapid proliferation can outcompete other aquatic plants for light and nutrients, causing significant changes in the aquatic ecosystem.

As filamentous algae grow, they can adversely affect water quality by depleting oxygen levels when they decompose, which can harm fish and other aquatic life. Additionally, the presence of these algae can block sunlight from reaching submerged plants, leading to further ecological imbalances. Understanding the connection between nutrient levels and filamentous algae growth is crucial for effective aquatic pest management and the maintenance of healthy aquatic ecosystems.