Which statement is true about algal blooms?

Algal blooms can indeed persist for extended periods even after the growth slows. This is due to the fact that the conditions which led to the initial bloom may still be present, allowing residual populations of algae to remain active at lower levels. Nutrient availability, such as nitrogen and phosphorus, can support continued growth and resilience of certain algal species, making them capable of surviving in that environment even when conditions are not optimal for rapid proliferation.

Additionally, while algal blooms can sometimes lead to temporary decreases in water quality, they do not always result in permanent changes. Furthermore, blooms can occur in both freshwater and saltwater environments, and they can have varying impacts on aquatic life that are not universally beneficial. Understanding the nature of algal blooms is crucial for effective aquatic management and maintaining healthy ecosystems.