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Recent reviews of archived samples by DNR scientists have shown that Cylindro has been present in some southern Wisconsin lakes dating back to the early 1980s.

It is likely that migratory waterfowl brought this algae to Wisconsin and other Midwestern states.

Green algae, shown here [PDF], can also bloom at nuisance levels and may be mistaken for blue-green algae.

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True algae (e.g., green algae) are very important to the food chain.

They are known as "primary producers", a name given to living organisms that can convert sunlight and inorganic chemicals into usable energy for other living organisms.

Here in Wisconsin, most of the state relies on groundwater, rather than surface water, for drinking water.

When a blue-green algae bloom dies off, the blue-green algae cells sink and are broken down by microbes.

Discolored water is an aesthetic issue, but when blue-green algae reach bloom densities, they can actually reduce light penetration, which can adversely affect other aquatic organisms both directly (e.g., other phytoplankton and aquatic plants) and indirectly (e.g., zooplankton and fish that depend on phytoplankton and plants).

Blue-green algae blooms can be quite smelly, and though it is recommended that people never drink raw water, blue-green algae have been known to affect the taste of drinking water that comes from surface waters experiencing a bloom.Most species are buoyant and will float to the surface, where they form scum layers or floating mats.When this happens, we call this a "blue-green algae bloom." In Wisconsin, blue-green algae blooms generally occur between mid-June and late September, although in rare instances, blooms have been observed in winter, even under the ice.Nutrients, particularly phosphorus and nitrogen, can be carried into water bodies as a result of many human activities, including agriculture, discharge of untreated sewage, and use of phosphorus-based fertilizers and detergents.Cylindrospermopsis raciborskii, also referred to as "Cylindro," is a blue-green algal species that is not native to Wisconsin.Many different species of blue-green algae occur in Wisconsin waters, but the most commonly detected include sp.

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