What is the most direct way to limit HABs?

What is the most direct way to limit HABs?

• A. Reduce phosphorus input into the water body
• B. Increase phosphorus input into the water body
• C. Inject algicides widely
• D. Remove all cyanobacteria

Answer: (A)

Limiting inputs of phosphorus to a water body directly reduces the nutrient that often drives harmful algal blooms. When phosphorus enters water from sources like agricultural runoff, wastewater, and detergents, it fuels rapid growth of cyanobacteria and other algae. Cutting these phosphorus inputs lowers the available resource for growth, leading to smaller or no blooms and helping the ecosystem recover over time. Options that focus on killing algae or removing cyanobacteria are not practical long-term solutions and can harm non-target organisms, while increasing phosphorus would simply feed the bloom.

Limiting inputs of phosphorus to a water body directly reduces the nutrient that often drives harmful algal blooms. When phosphorus enters water from sources like agricultural runoff, wastewater, and detergents, it fuels rapid growth of cyanobacteria and other algae. Cutting these phosphorus inputs lowers the available resource for growth, leading to smaller or no blooms and helping the ecosystem recover over time. Options that focus on killing algae or removing cyanobacteria are not practical long-term solutions and can harm non-target organisms, while increasing phosphorus would simply feed the bloom.