Types of Water Ecosystems

By: Jessica S, Micah A.

Fresh Water

Freshwater is defined as having a low salt concentration — usually less than 1%. Plants and animals in freshwater regions are adjusted to the low salt content and would not be able to survive in areas of high salt concentration (i.e., ocean).


They range in size from a few meters to thousand square kilometers. Most of the fresh body waters are reminants of Pleistocene glaciation. They can also be found from mountain tops and small streams.


Examples consist of ponds, lakes, and rivers.