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Not only have the symbionts and specific species been shown to shift, but there seems to be a certain growth rate favorable to selection. Slower-growing but more heat-tolerant corals have become more common.[82] The changes in temperature and acclimation are complex. Some reefs in current shadows represent a refugium location that will help them adjust to the disparity in the environment even if eventually the temperatures may rise more quickly there than in other locations.
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Many corals in the order Scleractinia clique aqui are hermatypic, meaning that they are involved in building reefs. Most such corals obtain some of their energy from zooxanthellae in the genus Symbiodinium. These are symbiotic photosynthetic dinoflagellates which require sunlight; reef-forming corals are therefore found mainly in shallow water.
[quarenta] Scleractinian skeletons are composed of a form of calcium carbonate known as aragonite.[41] Although they are geologically younger than the tabulate and rugose corals, the aragonite of their skeletons is less readily preserved, and their fossil record is accordingly less complete.
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Soft corals have pelo solid exoskeleton per se. However, their tissues are often reinforced by small supportive elements known as "sclerites" made of saiba mais calcium carbonate.
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Presently, corals are classified as certain species of animals within the sub-classes Hexacorallia and Octocorallia of the class Anthozoa in the phylum Cnidaria.[seis] Hexacorallia includes the stony corals and these groups have polyps that generally have a 6-fold symmetry.