Deep coral reef

Deep coral reef

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Caption: Deep sea corals growing some 160 metres below the surface. At these depths very little light reaches the seabed, so the corals do not form the huge colourful colonies seen in tropical shallows. In shallow, light water corals contain symbiotic zooxanthellae algae that provide the coral animals with nutrients produced by photosynthesis. At these depths, the corals rely on filtering food particles from the water, and are thus far more slow-growing than their shallow counterparts. Photographed off Hawaii, USA.

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Keywords: 1900s, 1982, 20th century, american, biological, biology, cnidarian, coelenterate, coral, dark, deep, deep-sea, depths, fauna, hawai'i, hawaii, invertebrate, invertebrates, marine biology, nature, pacific ocean, sea, underwater, united states, us, usa, zoological, zoology

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