Knowra Freshwater ecosystem Freshwater ecosystem An ecological system in inland water with low concentrations of dissolved salts, comprising organisms, their physical environment, and interactions among them.
Freshwater : Water containing low concentrations of dissolved salts, found in rivers, lakes, wetlands, and underground aquifers. Its low salinity distinguishes these systems from marine and brackish ecosystems.
Aquatic food web : A network of feeding relationships among organisms in an aquatic environment. It traces how energy and matter pass through freshwater communities.
Biological monitoring : The use of organisms or biological responses to assess environmental conditions over time. Freshwater species and communities reveal ecological changes that water chemistry alone may miss.
Freshwater biodiversity : The variety of genes, species, and ecosystems found in inland waters. These ecosystems support distinctive species, many of which face concentrated threats.
Marine ecosystem : An ecological system in ocean or sea water, characterized by high concentrations of dissolved salts. Marine ecosystems share aquatic processes but operate under much higher salinity.
Lentic ecosystem : An aquatic ecosystem in standing or slowly moving inland water, such as a lake or pond. Still-water habitats form one major class of freshwater ecosystem.
Primary production : The formation of organic matter from inorganic substances, chiefly through photosynthesis or chemosynthesis. Algae and aquatic plants supply much of the ecosystem’s biological energy.
Water quality : The chemical, physical, and biological properties of water that determine its suitability for organisms and uses. Water-quality measurements help assess stress and habitat conditions in freshwater systems.
Freshwater extinction crisis : The severe global decline and elevated extinction risk of species inhabiting inland waters. Habitat loss, pollution, overuse, and invasive species drive exceptional losses in freshwater life.
Estuary : A coastal water body where river freshwater mixes with seawater. Estuaries are transitional systems whose salinity varies between freshwater and marine conditions.
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