Aquatic biomes Aquatic biomes The term aquatic refers to water and can be either a noun or an adjective. Dictionary definitions do not specify what kind of water, although in both general use and in the sciences, the implication is that of fresh water. The term marine is typically substituted where reference to salt water is intended. ...more on Wikipedia about "Aquatic"
The benthic zone is the lowest level of a body of water, such as an ocean or a lake. It is inhabited mostly by organisms that tolerate cool temperatures and low oxygen levels, called benthos or benthic organisms. The profundal, limnetic, and littoral zones can be found above the benthic zone. No light other than bioluminescence is found in the benthic zone; it is part of the aphotic zone. ...more on Wikipedia about "Benthic zone"
The continental shelf is the extended perimeter of each continent, which is covered during interglacial periods such as the current epoch by relatively shallow seas (known as shelf seas) and gulfs. The shelf usually ends at a gradual slope (called the shelf break). The sea bottom below the break is the continental slope. The slope merges into the deep ocean floor, the abyssal plain. ...more on Wikipedia about "Continental shelf"
A littoral is the region near the shoreline of a body of fresh or salt water. The term may also be used as an adjective. Depending on context, it may mean the region within a few meters of the water, or everything influenced, possibly extending back many kilometers. ...more on Wikipedia about "Littoral"
The profundal zone is a deep zone of a body of water, such as an ocean or a lake, located below the range of effective light penetration. This is typically below the thermocline, the vertical zone in the water through which temperature drops rapidly. The lack of light in the profundal zone determines the type of biological community that can live in this region, which is distinctly different from the community in the overlying waters. The profundal zone is part of the aphotic zone. ...more on Wikipedia about "Profundal zone"
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