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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).
Before the early 1960s it was debated whether coral reefs could develop off the Texas coast; some researchers predicted the area would be too cold, or too turbid to support any extensive reef development. A series of scientific scuba diving expeditions, however, revealed that EFGB and WFGB did indeed support extensive coral reef systems. [3]
These corals are increasingly at risk of bleaching events where polyps expel the zooxanthellae in response to stress such as high water temperature or toxins. Other corals do not rely on zooxanthellae and can live globally in much deeper water, such as the cold-water genus Lophelia which can survive as deep as 3,300 metres (10,800 feet; 1,800 ...
Its corals are also about 60 feet (18 meters) below the surface and surrounded by even deeper waters, compared with many reefs where corals are in shallower water just offshore.
Texas A&M University-Corpus Christi turned to NSU when its partners in the Keys were no longer able to provide corals for its research. Broward County was spared from the majority of the 2023 bleaching so the NSU offshore coral nursery had healthy corals to donate. “We’re losing corals at an alarming rate,” Bahr said.
Deep-water coral inhabits greater depths and colder temperatures at much higher latitudes, as far north as Norway. [65] Although deep water corals can form reefs, little is known about them. The northernmost coral reef on Earth is located near Eilat, Israel. [66]
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 ...
Historically, industrial fishers avoided coral because their nets would get caught on the reefs. In the 1980s, "rock-hopper" trawls attached large tires and rollers to allow the nets to roll over rough surfaces. Fifty-five percent of Alaskan cold-water coral that was damaged by one pass from a bottom trawl had not recovered a year later.