Which organism is primarily involved in HABs?

Which organism is primarily involved in HABs?

• A. Diatoms
• B. Green algae
• C. Dinoflagellates
• D. Cyanobacteria

Answer: (D)

Harmful algal blooms are most often driven by cyanobacteria in freshwater systems. These photosynthetic bacteria, often called blue-green algae, can rapidly multiply when nutrients are high and conditions are warm, forming dense surface blooms. Many cyanobacteria produce potent toxins such as microcystins and anatoxins, which can contaminate drinking water, harm aquatic life, and pose risks to humans. Because they thrive in nutrient-rich, still or slow-moving waters, cyanobacteria are the primary agents behind HABs in many freshwater environments. In marine settings, other groups like dinoflagellates or diatoms can cause HABs, but the strongest link in freshwater scenarios is cyanobacteria.

Harmful algal blooms are most often driven by cyanobacteria in freshwater systems. These photosynthetic bacteria, often called blue-green algae, can rapidly multiply when nutrients are high and conditions are warm, forming dense surface blooms. Many cyanobacteria produce potent toxins such as microcystins and anatoxins, which can contaminate drinking water, harm aquatic life, and pose risks to humans. Because they thrive in nutrient-rich, still or slow-moving waters, cyanobacteria are the primary agents behind HABs in many freshwater environments. In marine settings, other groups like dinoflagellates or diatoms can cause HABs, but the strongest link in freshwater scenarios is cyanobacteria.