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Marine biogenic calcification is the biologically mediated process by which marine organisms produce and deposit calcium carbonate minerals to form skeletal structures or hard tissues. This process is a fundamental aspect of the life cycle of some marine organisms, including corals , mollusks , foraminifera , certain types of plankton , and ...
This is calcified green algae compared with a 10 centimeter (3.93 in.) marker. Algas calcareas, also known as AlgaeCal, is a plant-based dietary supplement derived from Lithothamnion superpositum, a red marine algae native to South America. It is a source of calcium, magnesium, and other trace minerals.
[58] [59] The calcium cycle is a common thread between terrestrial, marine, geological, and biological processes. [114] Calcium moves through these different media as it cycles throughout the Earth. The marine calcium cycle is affected by changing atmospheric carbon dioxide due to ocean acidification. [57]
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]
Calcium supplements made from Lithothamnium calcareum. The species Lithothamnium calcareum is, besides Tricalcium phosphate, often used as food fortification in plant-based milk substitutes to achieve a similar calcium content as a cow milk which is around 120 mg/100 ml. [2] However, in April 2021 the European Court of Justice forbade its use in organic food products such as drinks.
The genus is one of the best studied examples of cryptic species pairs due to morphological convergence within the marine macroalgae. [8] [9] [10] Some species grow so vigorously in tropical lagoons that the sediment is composed solely of the remains of their tissues, forming a calcareous "Halimeda sand".
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