What causes HABs?

Environmental factors such as the presence of nutrients, warm temperatures, and increased periods of sunlight can encourage the natural increase of cyanobacteria which is why blooms occur more frequently during the summer time. Agricultural (fertilizer) runoff and wastewater effluent are sources of nutrients that have been linked to higher rates of these bacteria.

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1. What are harmful algal blooms (HABs)?
2. What causes HABs?
3. What are the potential effects of HABs?
4. How do I know if a HAB is occurring?
5. What to do if you notice a HAB?