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They found the coral moves by inflating and deflating its tissue in rhythmic bursts to propel itself forward, like jellyfish do, with a strong preference for blue and white light. Such free-living ...
When corals bleach, blue light inside the coral tissue increases greatly because it is no longer being absorbed by the photosynthetic pigments found inside the symbiotic algae, and is instead reflected by the white coral skeleton. [156] This causes an increase in the production of the sun-screening pigments, making the bleached corals appear ...
Zooxanthellae require a mixture of white and blue light to thrive within the coral, depending on the coral type. [11] Some corals, like the orange cup coral, do not require light, and rely on the plankton or free-floating nutrients as sustenance. [12] Coral reefs protect the coastline from erosion and storm damage.
Corals are highly adapted to their local seasonal temperature and light conditions, influencing their physiology and calcification rates. [15] While increased temperature or light levels typically stimulate calcification up to a certain optimum, beyond which rates decline, the effects of temperature and light on the calcifying fluid chemistry ...
The classification of corals has been discussed for millennia, owing to having similarities to both plants and animals. Aristotle's pupil Theophrastus described the red coral, korallion, in his book on stones, implying it was a mineral, but he described it as a deep-sea plant in his Enquiries on Plants, where he also mentions large stony plants that reveal bright flowers when under water in ...
While most fire corals are yellow or orange, they can also be found in shades of brown, green, and even blue, providing a vibrant display underwater. [1] Fire coral has several common growth forms; these include branching, plate, and encrusting. Branching fire coral adopts a calcareous structure which branches off into rounded, finger-like tips.
Unlike stony corals, most soft corals thrive in nutrient-rich waters with less intense light. Almost all use symbiotic photosynthetic zooxanthella as a major energy source. However, most readily eat any free-floating food, such as zooplankton, out of the water column.
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