Freshwater ecosystems are among the earth aquatic ecosystems. They include lakes and ponds, rivers, streams and springs, 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, and vegetation.

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References

• http://en.wikipedia.org/wiki/Freshwater_biology
• Leathwick J.R.; Collier K.; Chadderton L. (2007) "Identifying freshwater ecosystems with nationally important natural heritage values: development of a biogeographic framework". Science for Conservation 274. p. 30. Department of Conservation (New Zealand).