A relationship in which a member of one species, the predator, eats or preys on a member of another species, the prey.

Competition between two or more species for the same resources.

Competition between members of one species for the same resources.

A close relationship between two species that may benefit one or both species.

A relationship in which one organism (parasite) benefits at the other organism’s (the host’s) expense.

A relationship in which both species benefit.

A relationship in which one species benefits while the other is not affected.

The sequential change over time in the composition of a community.

Ecological succession that takes place in a previously uncolonized area typically lacking soil.

Ecological succession that takes place in a previously colonized area that has been disturbed.

The first species to inhabit a previously uncolonized or disturbed area, leading to primary or secondary succession.

An occurrence that changes a community, such as a fire, drought, or animal movement Disturbances help maintain species diversity.

A species that plays an important role in determining the structure of a community.

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