Understanding Algal Blooms

What is a primary cause of algal blooms?

• Low oxygen levels

• Excess nutrients in water, especially nitrogen and phosphorus.

• High water temperature

• Presence of certain fish species

How do excess nutrients in water lead to algal blooms?

• Algal blooms occur due to lack of nutrients.

• Excess nutrients reduce algae growth.

• Excess nutrients purify the water, preventing blooms.

• Excess nutrients in water lead to algal blooms by promoting rapid algae growth.

What role does temperature play in algal bloom formation?

• Temperature has no effect on algal bloom formation whatsoever.

• Lower temperatures decrease algal bloom formation by reducing growth rates.

• Higher temperatures promote algal bloom formation by increasing growth rates and nutrient availability.

• Cooler temperatures increase nutrient availability for algal blooms.

Which type of algae is commonly associated with harmful blooms?

• Brown algae

• Red algae

• Cyanobacteria (blue-green algae)

• Green algae

What effect do algal blooms have on oxygen levels in water?

• Algal blooms increase oxygen levels in water.

• Algal blooms decrease oxygen levels in water.

• Algal blooms have no effect on oxygen levels.

• Algal blooms stabilize oxygen levels in water.

How can algal blooms impact fish populations?

• Algal blooms improve water clarity, benefiting fish habitats.

• Algal blooms negatively impact fish populations by causing oxygen depletion, producing toxins, and blocking sunlight.

• Algal blooms enhance fish populations by providing more food.

• Algal blooms have no effect on fish populations whatsoever.

What are some signs of an algal bloom in a body of water?

• Clear water with no visible changes

• Signs of an algal bloom include discolored water, surface scum, dead fish, and foul odors.

• Normal fish activity without any signs of distress

• Presence of aquatic plants only

Which type of algae can produce toxins harmful to humans?

• Chlorophytes

• Rhodophytes

• Dinoflagellates

• Cyanobacteria

How do algal blooms affect the food chain in aquatic ecosystems?

• Algal blooms disrupt the food chain by causing oxygen depletion and reducing biodiversity in aquatic ecosystems.

• Algal blooms increase fish populations by providing more food.

• Algal blooms have no impact on aquatic ecosystems.

• Algal blooms enhance water clarity and promote plant growth.

What human activities contribute to nutrient runoff in water bodies?

• Natural sedimentation processes

• Rainwater harvesting systems

• Industrial waste disposal

• Agricultural runoff, urban stormwater runoff, and wastewater discharge.