BackIntroduction to Aquatic Biomes definitions
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1/16BackSkip to main contentBackAquatic Biome
A large ecosystem dominated by water, defined mainly by physical and chemical factors like salt concentration. Freshwater Biome
An ecosystem with less than 0.1% salt, including lakes, rivers, and streams, making up only 3% of Earth's water. Marine Biome
A saltwater ecosystem, such as oceans, with about 3% salt, accounting for 97% of Earth's water. Intertidal Zone
A marine area between high and low tide marks, exposed to air at low tide and submerged at high tide. Continental Shelf
A submerged, gently sloping extension of a continent, ending at a steep drop-off in marine environments. Neuritic Zone
A shallow, nearshore marine region between the low tide mark and the edge of the continental shelf. Littoral Zone
A shallow, nearshore area in lakes, analogous to the neuritic zone in oceans, supporting diverse life. Oceanic Zone
A deep, offshore marine region extending beyond the continental shelf, characterized by open water. Limnetic Zone
An open water area in lakes, away from the shore, similar to the oceanic zone in marine biomes. Pelagic Zone
All open water regions in oceans or lakes, combining nearshore and offshore zones above the bottom. Benthic Zone
The entire bottom surface of a lake or ocean, regardless of depth, often rich in nutrients. Photic Zone
A sunlit surface layer in aquatic environments where enough light penetrates to support photosynthesis. Aphotic Zone
A deep, dark aquatic region where sunlight is insufficient for photosynthesis, limiting plant life. Seasonal Turnover
A process in lakes where water layers mix during spring and fall, redistributing nutrients and oxygen. Ocean Upwelling
A coastal process where deep, cold, nutrient-rich water rises to replace surface water moved by wind. Thermocline
A distinct layer in a body of water where temperature changes rapidly with depth, affecting mixing.
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