The bathyal zone or bathypelagic – from Greek βαθύς (bathýs), deep – (also known as midnight zone) is the part of the pelagic zone that extends from a depth of 1000 to 4000 metres (3300 to 13000 feet) below the ocean surface. It lies between the mesopelagic above, and the abyssopelagic below. The average temperature hovers at about 39 °...
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http://en.wikipedia.org/wiki/Bathyal_zone
marine ecologic realm extending down from the edge of the continental shelf to the depth at which the water temperature is 4° C (39° F). Both of ... [1 related articles]
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http://www.britannica.com/eb/a-z/b/31
bathyal zone The biogeographic realm of the ocean depths between 100 and 1000 fathoms (180 and 1800 meters).
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Upper part of the ocean, which lies on the continental shelf at a depth of between 200 m/650 ft and 2,000 m/6,500 ft. Bathyal zones (both temperate and tropical) have greater biodiversity than coral reefs, according to a 1995 study by the Natural History Museum in London. Maximum biodiversity occurs between 1,000 m/3,280 ft and 3,000 m&...
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https://www.encyclo.co.uk/local/21221
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