Dictionary definition: abyssal zone

Dictionary definition: aphotic zone
A Dictionary of Biology;      283 words ...aphotic zone ( bathypelagic zone ) The region of a lake or ... is situated beneath the euphotic zone . The aphotic zone contains no algae or phytoplankton, and its ... or less in turbid waters, and includes the abyssal zone .

Article: Life in Water
Water:Science and Issues;      700+ words ... ... species that feed on phytoplankton. Below the photic zone is the aphotic zone, which is characterized by very limited light (or no light) and limited food. Species in the aphotic zone often depend on food drifting down from above. Consequently ...

Dictionary definition: euphotic zone
A Dictionary of Ecology;      294 words ... ... In marine ecosystems it is much thinner than the deeper aphotic zone , typically reaching 30 m in coastal waters but extending ... into littoral (shallow edge) and limnetic zones. Compare aphotic zone ; dysphotic zone ; photic zone ; and profundal zone .

Dictionary definition: bathypelagic zone
A Dictionary of Biology;      220 words ...bathypelagic zone See aphotic zone .

Dictionary definition: disphotic zone
A Dictionary of Plant Sciences;      226 words ...disphotic zone See APHOTIC ZONE .

An ocean of life.(LIFE IN THE OCEAN)
The Handy Ocean Answer Book;  January 1, 2000 ;     700+ words ... ... light, below about 3,000 feet (roughly 900 meters), which entails 90 percent of the space in the ocean, is called the aphotic zone. It is subdivided into the bathyal, abyssal, and hadalpelagic zones. Where is most life found in the oceans? Most of ...

Article: Lakes: Chemical Processes
Water:Science and Issues;      700+ words ... ... Thus, a significant difference often exists between the oxygen-rich euphotic zone and the underlying, oxygen-poor aphotic zone. The presence or absence of oxygen has significant effects on the important oxidation–reduction chemistry ...