Substrate

Substrate

**//Substrate is the material that organisms live in, on, or around. //**

Most invertebrates in a stream or river live on or under rocky substrates.




 * Some fresh water organisms live in the substrate
 * One type of dragonfly larva live in the sandy substrate and use a long siphon to gather oxygen from water above
 * In forested areas some species, such as beetles, use wood as a substrate

- Organic substrate includes algae and other small particals of matter that are generally used for food. - Inorganic substrates are pebbles and rocks in the stream and the slit, sand and mud that compose the stream.