Fishes adapted to low oxygen conditions
The most famous occupants in these streams are fish
Diatoms (algae) often cover the cobbles
A wide variety of insect larvas can be found on the sides and bottoms of the rocks
Insect larvae adapted to mud
The blue-green algae Rivularia covers the rock in a sluppery mass. Its cells are held together in chains by a gelatinous sheath
A wide variety of worms live in this area
The mayfly has a flat body, strong claws, muscular legs and a suction disk
Rooted pond-plants grow along this area
Phytoplankton species are usually adapted to slow water
Rooted aquatic plants need the protection of rocks to become stablished
