Know about Algal Blooms
Jar test for Cyanobacteria
A jar test for cyanobacteria is a simple visual method to differentiate them from other algae:
1. Collect sample of the water abd algae in a clear jar or plastic bottle
2. Let it sit undisturbed (often overnight), and observe.
3. If a greenish layer or scum forms at the top surface, it's likely cyanobacteria
4. If the material sinks to the bottom ore remains suspended, it's probably green algae or organic matter.
5. This test indicates presence but doesn't confirm if a bloom is toxic, which requires lab analysis, but it's a quick first step for identification
Why does cyanobacteria rise to the top?
Vocabulary
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Algal Bloom: A rapid population increase of algae or bacteria in water, which can discolor the water.
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Cyanobacteria (Blue-green algae): Photosynthetic bacteria that can bloom and produce toxins harmful to animals and humans.
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Harmful Algal Bloom (HAB): excess algae that makes the water turbid or blocks ultraviolet light. Some blooms produces toxin or negatively impact marine life, human health, or the environment.
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Eutrophication: When a water body is enriched with excessive nutrients, like nitrogen and phosphorus, causing excessive algal growth.
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Hypoxia: A condition of low dissolved oxygen in water, often caused by decomposing algae, creating "dead zones".
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Nutrient Pollution: The presence of too many nutrients, like phosphates and nitrogen, in water, often from sources such as agricultural runoff or sewage.
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Nutrient Runoff: The flow of excess nutrients from land into water, a major cause of eutrophication and blooms.
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Phytoplankton: Microscopic photosynthetic organisms at the base of aquatic food webs; some species multiply rapidly during blooms
Learn to recognize Harmful algal blooms
This fun quiz shows examples of different algal blooms found in Maryland and asks users to identify which ones are harmful. It also provides explanations and knowledge about various algae species
Science experiment
A hands on experiment from Science Buddies. It shows you step-by-step how to test the effect of different fertilizers on algal growth. It is a great resource for students, teachers, and anyone who wants to learn through doing:
EPA recommendation for cyanotoxin level monitoring
EPA recommended Values for Recreational Criteria and Swimming Advisories for Cyanotoxins. The agency has identified recommended concentrations of two cyanotoxins (microcystins and cylindrospermopsin) at or below which human health is protected while swimming or participating in other recreational activities in and on the water. States, territories, and authorized Tribes can consider adopting these recommended criteria into their water quality standards and using them
Read EPA recommendations here
Check if your state follows EPA recommendations
