Which nutrient is commonly associated with algae blooms in water bodies?

Phosphorus is widely recognized as the nutrient most commonly associated with algal blooms in aquatic ecosystems. This is because phosphorus serves as a critical limiting nutrient for algae growth. When phosphorus concentrations increase, due often to runoff from agricultural land, urban areas, or wastewater discharge, it can lead to excessive growth of algae, known as algal blooms. These blooms can deplete oxygen in the water when the algae die and decompose, leading to hypoxic conditions that can be detrimental to aquatic life.

While nitrogen is also an important nutrient for aquatic plants and can contribute to algal blooms, phosphorus is typically the limiting nutrient in freshwater systems. Therefore, controlling phosphorus levels is often crucial in managing and preventing harmful algal blooms.