Biotic factors

Biotic factors are interactions associated with living organisms.

Examples of biotic factors are:

  • food availability
  • competition for environmental resources
  • grazing
  • predation
  • disease

Competition in ecosystems

Competition will occur between organisms in an ecosystem when both try to use the same resource and the resource is in limited supply.

Animals compete for food, water and space to live.

Plants compete for light, water, minerals and root space.

Tall Redwood trees
Redwood trees competing for light

The extreme height to which redwood trees grow is a consequence of competition for light.