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When are Lake Tahoe beaches sampled for harmful algal blooms? If extreme rainfall events become more frequent (as they are projected to) stormwater, surface water, and groundwater discharges will deliver more nutrients to water bodies, fueling the growth of HABs.Intervals of drought can contribute to stagnant or slow-moving water, which helps harmful algae outcompete non-toxic forms of algae.Warmer temperatures can favor blooms because many cyanobacteria are adapted to hot conditions where they often outcompete non-toxic forms of algae.Algal mats can also become stranded on shorelines.Ĭommon factors contributing to blooms are warmer temperatures, slow or stagnant water and nutrients in the water that serve as food for algal organisms.Ĭurrent research suggests that rising temperatures and changing precipitation events associated with climate change may contribute to the increase in HAB events. In rivers, HABs look like algal mats that are attached to the channel bottom. In lakes, HABs usually appear as a mix of intense shades of green in a paint-like sheen on the water’s surface.
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HABs may look like thick paint floating on the water or as algal mats in rivers, streams, and along the shallow shorelines of lakes. HABs are formed by tiny organisms called cyanobacteria and can make the water a variety of colors such as green, white, red, or brown. In 2022, HABs were discovered on the south shore along Regan Beach, Barton Beach, Kiva Beach, and in the shallow lagoons of the Tahoe Keys.
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On the California side of Lake Tahoe, the Lahontan Regional Water Quality Control Board (Water Board) tests for, monitors and provides signage to warn the public of risks associated with HABs. HABs, however, pose a risk to public health and safety. HABs are often mistaken for harmless types of algae or cyanobacteria that look like algae, which naturally occur in Tahoe and can be found clinging to rocks and washing up on beaches.
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