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surrounded by land, where fresh water from a river mixes with ocean water. estuaries are surrounded by mud, sand, barrier islands, or reefs which protect them from wind and waves. these protected areas provide feeding, breeding, and nesting grounds for a wide variety of species, including fish, shellfish, birds
ability to respire, feed and reproduce. temperature will fluctuate naturally with seasonal change, but these changes usually happen slowly, giving organisms time to acclimate. sudden changes in temperature can send animals into shock, and very warm water often cannot hold enough oxygen for fish and other...
https://www.georgiaaquarium.org/wp-content/uploads/2018/10/An-Estuary-Field-Study.pdf