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Brackish ecosystems are formed by the mixture of salt and fresh water.
Estuaries.
In fresh water aquatic ecosystems unicellular, colonial and filamentous micro-organisms comprise the most important producers. A large number of fauna depend on these producer micro-organisms.
they are both marine ecosystems
Rocks and sand.
Phytoplankton
reshwater ecosystems are anything from ponds and lakes to rivers and streams. Anything that lives in/around fresh water sources. Even swamps are considered fresh water ecosystems.
The four types of Aquatic Ecosystems are - 1. Oceans are the largest of the ecosystems covering more than 70 % of the earth's surface. 2. Freshwater bodies like lakes and ponds 3. Flowing fresh water like rivers and streams 4. Wetlands with wet soil and plants that grow in this type of soil
The 7 aquatic biomes are ponds lakes, rivers, streames, estuaries, sea shores,and coral reefs.
flowing water and standing water
Fresh water aquatic life.
Producer protista would be mostly restricted to aquatic (marsh, lake , pond or stream) Brackish(mixed salt and fresh water) or Marine ecosystems. Remember they function primarily in fluid envirenments or habitats.