Submarine springs found along the coast of Mexico's Yucatán Peninsula produce water with a naturally low pH (relatively high acidity) providing conditions similar to those expected to become widespread as the oceans absorb carbon dioxide.
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Rugose or horn corals became dominant by the middle of the Silurian period, and became extinct early in the Triassic period. The rugose corals existed in solitary and colonial forms, and were also composed of calcite.[39]
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A typical coral colony forms several thousand larvae per year to overcome the odds against formation of a new colony.[26]
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Many corals, as well as other cnidarian groups such as sea anemones form a symbiotic relationship with a class of dinoflagellate algae, zooxanthellae of the genus Symbiodinium, which can form as much fonte as 30% of the tissue of a polyp.[16]:23-24 Typically, each polyp harbors one species of alga, and coral species show a preference for Symbiodinium.[17] Young corals are not born with zooxanthellae, but acquire the veja mais algae from the surrounding environment, including the water column and local sediment.
Annual growth bands in some corals, such as the deep sea bamboo clique aqui corals (Isididae), may be among the fonte first signs of the effects of ocean acidification on marine life.
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