Which type of algae would most likely be found in nutrient-rich waters?

• A. Green algae
• B. Blue-green algae
• C. Red algae
• D. Brown algae

Answer: (B)

Blue-green algae, also known as cyanobacteria, thrive in nutrient-rich waters primarily because they can rapidly utilize the excess nutrients, particularly nitrogen and phosphorus, that often come from agricultural runoff, wastewater discharges, and other sources of pollution. These conditions create an ideal environment for their growth, leading to blooms that can sometimes become quite large and harmful to aquatic ecosystems.

While other types of algae, like green algae or brown algae, can also inhabit nutrient-rich waters, blue-green algae are notably known for their ability to proliferate in such environments, often resulting in visible and significant algal blooms. These blooms may deplete oxygen in the water and produce toxins, which can affect aquatic life and human health. Thus, blue-green algae are most commonly associated with nutrient overload situations.