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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.
As of 2018, carrageenan was deemed non-toxic under certain consumption levels (75 mg/kg of body weight per day), although further research was recommended, mainly focused on the fate of carrageenan during and after digestion, and on any subsequent metabolites.
Rhodolith communities contribute significantly to the global calcium carbonate budget, and fossil rhodoliths are commonly used to obtain paleoecologic and paleoclimatic information. [ 17 ] [ 18 ] [ 19 ] Under the right circumstances, rhodoliths can be the main carbonate sediment producers, [ 20 ] [ 21 ] often forming rudstone or floatstone beds ...
Beachgoers could soon be seeing red off the Florida coast. A microscopic algae is growing out of control in the Gulf Coast. Although it can be toxic to marine life, some scientists are unsure if ...
Coralline algae are especially important in reef construction, as they lay down calcium carbonate as calcite. Although they contribute considerable bulk to the calcium carbonate structure of coral reefs, their more important role in most areas of the reef, is in acting as the cement which binds the reef materials into a sturdy structure. [38]
A toxic algae bloom is injuring or killing scores of marine animals, from fish to sea lions and dolphins. Along the Southern California coast, there are deadly signs of a warming ocean. "It is ...
Coralline algae, which secrete calcium carbonate and play a major role in building coral reefs, belong there. Red algae such as Palmaria palmata (dulse) and Porphyra species (laver/nori/gim) are a traditional part of European and Asian cuisines and are used to make products such as agar, carrageenans, and other food additives. [16]
In marine environments, HABs are mostly caused by dinoflagellates, [31] though species of other algae taxa can also cause HABs (diatoms, flagellates, haptophytes and raphidophytes). [32] Marine dinoflagellate species are often toxic, but freshwater species are not known to be toxic. Neither are diatoms known to be toxic, at least to humans. [33]