Ajudar Os outros perceber as vantagens da grupo coral

The two polyps thus created then generate their missing body parts and exoskeleton. Transversal division occurs when polyps and the exoskeleton divide transversally into two parts. This means one has the basal disc (bottom) and the other has the oral disc (top); the new polyps must separately generate the missing pieces.

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ESTES corais podem constituir colônias coloridas e podem formar recifes do grandes dimensões que albergam um ecossistema utilizando uma Colossal biodiversidade e produtividade.

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If the stressful conditions persist, the polyp eventually dies.[23] Zooxanthellae are located within the coral cytoplasm and due to the algae's photosynthetic activity the internal pH of the coral can be raised; this behavior indicates that the zooxanthellae are responsible to some extent for the metabolism of their host corals [24] Reproduction[edit]

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Planula larvae exhibit positive phototaxis, swimming towards light to reach surface waters, where they drift and grow before descending to seek a hard surface to which they can attach and begin a new colony. They also exhibit positive sonotaxis, moving mais towards sounds that emanate from the reef and away from open water.

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Many corals, as well as other cnidarian groups such as sea saiba mais anemones form a symbiotic relationship with a class of dinoflagellate algae, zooxanthellae of the genus Symbiodinium, which can form as much 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 algae from the surrounding environment, including the water column and local sediment.

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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 veja mais have polyps that generally have a seis-fold symmetry.

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