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Algal blooms, especially large algal bloom events, can reduce the transparency of the water and can discolor the water. [2] The photosynthetic pigments in the algal cells, like chlorophyll and photoprotective pigments, determine the color of the algal bloom. Depending on the organism, its pigments, and the depth in the water column, algal ...
Cyanobacteria (blue-green algae) bloom on Lake Erie (United States) in 2009. These kinds of algae can cause harmful algal bloom. A harmful algal bloom (HAB), or excessive algae growth, is an algal bloom that causes negative impacts to other organisms by production of natural algae-produced toxins, water deoxygenation, mechanical damage to other organisms, or by other means.
In freshwater ecosystems, algal blooms are most commonly caused by high levels of nutrients (eutrophication). The blooms can look like foam, scum or mats or like paint floating on the surface of the water, but they are not always visible. Nor are the blooms always green; they can be blue, and some cyanobacteria species are coloured brownish-red.
Death notices are provided to The News Tribune once per month by the Tacoma-Pierce County Health Department.
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These algal blooms caused by K. brevis produce brevetoxins, which can result in significant ecological impacts through the death of large numbers of marine animals and birds, to include marine mammals. [15] Large scale fish kills are known to occur due to these Florida Red Tides caused by K. brevis. Fish species through the food chain are ...
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Because algae often reproduce in large sporadic bouts, referred to as algal blooms, the term "superbloom" is sometimes applied to especially prolific short-term algal growth that causes discoloration of water on a large scale. [19] [20] Other than sharing a botanical context, however, the two events have nothing in common. [citation needed]