To limit HABs, which action targets nutrient levels?

To limit HABs, which action targets nutrient levels?

• A. Increase phosphorus input
• B. Remove algae physically
• C. Add nitrogen fertilizer
• D. Reduce phosphorus entering water body

Answer: (D)

Limiting HABs hinges on cutting the nutrients that fuel algal growth. In many freshwater systems, phosphorus is the nutrient that most strongly drives these blooms. By reducing phosphorus entering the water body, you directly lower the nutrient load available for algae, making blooms less likely and less intense. Removing algae after a bloom doesn’t change the nutrients that allowed it to bloom, so blooms can recur. Adding more nitrogen or phosphorus would supply even more nutrients, potentially worsening the problem. So, lowering phosphorus input directly targets nutrient levels and helps prevent HABs.

Limiting HABs hinges on cutting the nutrients that fuel algal growth. In many freshwater systems, phosphorus is the nutrient that most strongly drives these blooms. By reducing phosphorus entering the water body, you directly lower the nutrient load available for algae, making blooms less likely and less intense. Removing algae after a bloom doesn’t change the nutrients that allowed it to bloom, so blooms can recur. Adding more nitrogen or phosphorus would supply even more nutrients, potentially worsening the problem. So, lowering phosphorus input directly targets nutrient levels and helps prevent HABs.