Abstract
Estuaries are characterized by the gradient of salinity in a semi-enclosed coastal system. A working classification for drowned river estuaries has been developed and is based on the dominance of certain terms in the salt balance equation. Tidal and wind energy, as well as freshwater flow and density gradients, are responsible for mixing. Suspended and bottom sediment distribution may be characterized for each estuarine type. These sediments are of exceptional importance to the routes and fates of nutrients and other chemical materials. Although particular estuaries are transient in geological or evolutionary time spans, the estuarine environment has been common through a long geologic time, resulting in the evolution of a group of organisms uniquely capable of using the salinity gradient to a competitive advantage. These species, well adapted to the rigorous estuarine environment, frequently produce high standing crops and biomass from a small number of species. The range of nutrient inputs to the estuarine system is reviewed, along with the major nutrient processes and pathways which operate internally. Particularly successful models of nutrient movement are discussed.
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Biggs, R.B., Cronin, L.E. (1981). Special Characteristics of Estuaries. In: Neilson, B.J., Cronin, L.E. (eds) Estuaries and Nutrients. Contemporary Issues in Science and Society. Humana Press. https://doi.org/10.1007/978-1-4612-5826-1_1
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DOI: https://doi.org/10.1007/978-1-4612-5826-1_1
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