Erin Keats and Emily Bode
Examples of freshwater regions are ponds, lakes, rivers, streams and wetlands. Freshwater contains less than 1% of salt concentration. Plants and animals that thrive in freshwater ecosystems have adapted to the low salt conditions and would have a hard time surviving in a salt water ecosystem.
Brackish Water Ecosystems
Brackish water is water that is saltier than fresh water, but not as salty as sea water. It can form from mixing seawater with fresh water. Examples of brackish water are estuaries and brackish fossil aquifers.
Saltwater ecosystems make up over 70% of the Earth's surface. The most commonly known example of this ecosystem is the oceans. To be a saltwater ecosystem, the water has to be made of at least 50% salt, 50% water. Plants and animals that live in this ecosystem are adapted to the highly salt concentrated water.