Aquatic Ecosystems

freshwater, brackish water and salt water

Freshwater ecosystem

Freshwater ecosystems include lakes, ponds, marshes,wetlands and rivers. They are different from the saltwater ecosystem because saltwater ecosystems have more salt content.There salt content is usually less than 1%. Freshwater lacks the buoyancy of salt water. More than half the drinking water comes from this resource. Freshwater has a lower freezing point than saltwater.

Brackish water ecosystem

Brackish water is a mixture of freshwater and saltwater commonly occurring when fresh water meets sea water. For example, the fresh water exiting the Mississippi river with its various deltas branches out into Brackish waterways and eventually end at the ocean gulf. Brackish water has more salinity than fresh water. Salinity refers to the dissolved salt content in the water. Another example of brackish water ecosystems are estuaries, mangroves and the Caspian Sea. Here the mangrove plant grows very well removing minerals and nutrients from the waters of the Brackish waters.

Salt water Ecosystem

Salt water ecosystems make up the largest aquatic systems on the planet. Salt water is more buoyant than freshwater making it easier to float on your back. Salt water and fresh water ecosystems share common animals.

Some types of salt water ecosystems are oceans estuaries, coral reefs and shorelines. Salt water causes water to freeze at a lower water temperature, as the saltwater concentration increases. The salinity of salt water or how much salt content is dissolved in the water varies throughout the oceans.