Search results
Results From The WOW.Com Content Network
Deep-water coral Paragorgia arborea and a Coryphaenoides fish at a depth of 1,255 m (4,117 ft) on the Davidson Seamount. The habitat of deep-water corals, also known as cold-water corals, extends to deeper, darker parts of the oceans than tropical corals, ranging from near the surface to the abyss, beyond 2,000 metres (6,600 ft) where water temperatures may be as cold as 4 °C (39 °F).
Next the corals are transported into floating nurseries in the sea. The corals float in the water column, attached on a submerged structure. Some authors recommend 6 metres depth to ensure the corals get the right amount of sunlight. They are affixed to an artificial substrate. This is usually made from string, wire, mesh, monofilament line or ...
Most reefs grow best in warm, shallow, clear, sunny and agitated water. Coral reefs first appeared 485 million years ago, at the dawn of the Early Ordovician, displacing the microbial and sponge reefs of the Cambrian. [2] Sometimes called rainforests of the sea, [3] shallow coral reefs form some of Earth's most diverse ecosystems.
Conservation status for warm-water reef-building corals was analysed for the International Union for Conservation of Nature’s (IUCN) Red List. 44% of warm-water coral species facing extinction ...
It was SoCal nurseryman Paul Ecke Sr. who took a little-known, spindly outdoor plant from Central America in the early 1920s and bred it into a hardy potted plant "whose tapering red leaves have ...
Corals might evade ocean warming by migrating into what had been cooler waters. [2] The planktonic larvae of the corals could colonise suitable new areas, but for corals in places like the Great Barrier Reef; the required migration rate is about 15 km per year, which is much faster than corals can grow. [2]
The best-known types of reefs are tropical coral reefs which exist in most tropical waters; however, coral reefs can also exist in cold water. Reefs are built up by corals and other calcium -depositing animals, usually on top of a rocky outcrop on the ocean floor.
Most of the latter are azooxanthellate and live in both shallow and deep sea habitats. In the deep sea they share the ecosystem with soft corals, polychaete worms, other worms, crustaceans, molluscs and sponges. In the Atlantic Ocean, the cold-water coral Lophelia pertusa forms extensive deep-water reefs which support many other species. [27]