Explain how current and oxygen content affect the biodiversity of streams and rivers.

The current determines the location of the organisms.

In streams or rivers which have fast currents, the only organisms tend to survive which have the mean to anchor themselves.

Most of the organisms tend to live at the bottom of the river or stream as swimming against the currents would require a lot of energy.

Oxygen content is also the factor which influences the location of organisms in an aquatic system.

The oxygen content at the source of the streams or rivers is higher as compared to the mouth of the river.

Consequently, the organisms which require more oxygen tend to find at the source of the rivers whereas the organisms which require less oxygen tend to find at the mouth of the river.