Estuary ecosystemWhat is the estuary? The estuary is a partially enclosed body of water formed where fresh water from rivers and streams flows into the ocean, mixing with salty sea water,” as noted by (Biomes (nd) The estuary is part of the marine ecosystem (ocean and lakes). The estuary is thought to be the part of the bay where fresh water mixes with salt water rivers. is considered brackish water that is not as salty as ocean water. Additionally, the estuary ecosystem is found along the coast, with thousands of birds and fish. , mammals, plants and other animals seek to settle in the estuary ecosystem although there is a rapid fluctuation in temperatures from warm to cold (Adaptation to estuaries (n.d.). Biotic factors are organisms that coexist in a particular habitat, such as birds like the great blue heron, geese, fish, bacteria and nutrients, many fish in the ocean depend on the sustainability of the estuary ecosystem and zooplankton is mainly produced by the estuary ecosystem, zooplankton thrives on phytoplankton then is transferred to the estuary....