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fresh·wa·ter
/ˈfreSHˌwôdər/adjective
- 1. of or found in fresh water; not of the sea: "freshwater and marine fish"
- 2. (especially of a school or college) situated in a remote or obscure area; provincial. informal US
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Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water , it does include non-salty mineral-rich waters such as chalybeate springs.
Freshwater ecosystems are a subset of Earth's aquatic ecosystems. They include lakes, ponds, rivers, streams, springs, bogs, and wetlands. They can be contrasted with marine ecosystems, which have a larger salt content. Freshwater habitats can be classified by different factors, including temperature, light penetration, nutrients, and vegetation.
Freshwater biology is the scientific biological study of freshwater ecosystems and is a branch of limnology. This field seeks to understand the relationships between living organisms in their physical environment. These physical environments may include rivers, lakes, streams, ponds, lakes, reservoirs, or wetlands. [1]
Distribution of saline and fresh water. The total volume of water on Earth is estimated at 1.386 billion km 3 (333 million cubic miles), with 97.5% being salt water and 2.5% being freshwater. Of the freshwater, only 0.3% is in liquid form on the surface. [2] [3] [4]
There is water scarcity, water pollution, water conflict and climate change. Fresh water is in principle a renewable resource. However, the world's supply of groundwater is steadily decreasing. Groundwater depletion (or overdrafting) is occurring for example in Asia, South America and North America.
The two main types of aquatic ecosystems are marine ecosystems and freshwater ecosystems. Freshwater ecosystems may be lentic (slow moving water, including pools, ponds, and lakes); lotic (faster moving water, for example streams and rivers); and wetlands (areas where the soil is saturated or inundated for at least part of the time).
The freshwater drum, Aplodinotus grunniens, is a fish endemic to North and Central America. It is the only species in the genus Aplodinotus, and is a member of the family Sciaenidae. It is the only North American member of the group that inhabits freshwater for its entire life.
Freshwater bivalves are one kind of freshwater mollusc, along with freshwater snails. They are bivalves that live in fresh water as opposed to salt water, which is the main habitat type for bivalves. The majority of species of bivalve molluscs live in the sea, but in addition, a number of different families live in fresh water (and in some ...
Global map of countries by total renewable internal freshwater resources (billion cubic meters) in 2020, China and Brazil has the highest freshwater per capita in 2024, according to World Bank [1] This is the list of countries by total renewable water resources for the year 2020, based on the latest data available in January 2024, by World Bank ...
Subcategories. This category has the following 11 subcategories, out of 11 total. Freshwater crustaceans of Africa (76 P) Freshwater crustaceans of Asia (1 C, 149 P) Freshwater crustaceans of Australia (1 C, 78 P) Freshwater crustaceans of Europe (63 P) Freshwater crustaceans of New Zealand (13 P) Freshwater crustaceans of ...