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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 ...
It predominantly grows on the lower shore, especially where fucoid algae are absent, but is also found further up shore on exposed coasts. It forms calcium carbonate deposits within its cells which serve to strengthen the thallus. These white deposits cause the seaweed to appear pink in colour, with white patches where the calcium carbonate 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]
Algae is an informal term for a widespread and diverse group of photosynthetic protists which are not necessarily closely related and are thus polyphyletic. Marine algae can be divided into six groups: green, red and brown algae, euglenophytes, dinoflagellates and diatoms.
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