indicator: A living thing whose presence
or absence tells something about the quality of the environment.
The wearing away of any part of the earth's surface by weathering,
corrosion, dissolution or abrasion.
web: The complex association of plants and animals in
nature whereby organisms are interconnected because they are sources
of food for one another. At the base of the wood web are green plants
and bacteria which supply food for small animals. Larger animals
eat smaller animals as well as plants. Detritovores recycle nutrients
by breaking down decaying plants and animals.
The specific environment or area in which a creature lives. For
example, the habitat for a stonefly nymph is the cool riffle of
requirements: Environmental conditions necessary for
survival of a given species.
Animals without backbones that are large enough to be seen without
The immature form of certain insects such as stoneflies, mayflies
and true bugs. Nymphs go through incomplete metamorphosis to become
The increase in water flow of rivers and streams caused by the melting
of mountain snow or extra flow of water into a creek during and
after rain storms:
Fine particles of sand and soil deposited by water.
The area around a stream that drain into the stream.