In the fresh water environment

Freshwaters offer an infinite range of chemical and physical conditions (temperature, depth, pH, etc.). In addition, the biocenoses that live in stagnant waters (swamps, ponds, lakes) are completely different from those of running waters (rivers, torrents). Stagnant waters have, like the sea, a benthos, a plankton and a nekton, but with fewer species. Running waters, due to changes in temperature and water movement, do not have a plankton.

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Facts