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Corallinales is the one genus of red algae exists but their distribution ranges across the world's oceans. [30] Examples include Corallina, Neogoniolithon, and Harveylithon. [30] The magnesium-rich calcium carbonate of Corallinales cell wall provides shelter from predators and structural integrity in the intertidal zone.
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]
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 ...
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]
Calcium carbonate thus becomes undersaturated, and structures made of calcium carbonate are vulnerable to calcification stress and dissolution. [94] In particular, studies show that corals, [ 95 ] [ 96 ] coccolithophores, [ 90 ] [ 28 ] [ 97 ] coralline algae, [ 98 ] foraminifera, [ 99 ] shellfish and pteropods [ 100 ] experience reduced ...
Streptophyte algae include all green algae, and are the only photosynthetic eukaryotes from which the macroscopic land flora evolved (red lines). That said, throughout the course of evolution, algae from various other lineages have colonized land (yellow lines) —but also streptophyte algae have continuously and independently made the wet to ...
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