Competition

Several pressures can act together: a species that has lost much of its habitat may be less able to withstand disease or competition.

Competition is a biotic factor because it involves living organisms. It happens when organisms need the same resource and there is not enough for all of them. Plants may compete for light, water, mineral ions and space.

Competition occurs when two or more organisms require the same resource and there is not enough for all of them.

Competition occurs when organisms require the same limited resource. An organism that obtains enough of that resource is more likely to survive, grow and reproduce; an organism that obtains too little may die or leave fewer offspring. Competition therefore limits population size.