Substrate4

__**Substrate**__

Substrate is the material that organisms live in, on, or around. The substrate in a stream or river live in organic or inorganic particles. Plants can also be substrates for example flies lay their larva on mosses.

Organic particles consist of algea and other small particles of matter that can be used as food. Inorganic particles consists of pebbles, rocks, sand, silt, and mud in a river and stream. __** Species **__ Most invertebrates live on or under rocky substrates.

Fresh water sponges live their whole life attached to rocks and boulders.

bull heads actually live deeply within the gravely substrate.

The different types of substrates help some species but not others so i guess that not one peticular substrate is better than the other. For example fish that like to dig for shelter like puffers sand is better but species that like to use substrate to protect them like crayfish live under rocks then gravel would be better. On the other plants would like soil to grow in.