all organisms in a habitat interact with eachother. a change in the size of one organisms population effeects the population size of the other organisms. there is a strong link with this and predator prey interactions. predators are adapted to hunt prey and prey are adapted to evade predators.
if there is a growth in the population size of prey the population size of predaors will grow as well because they have more food so more of their young survive.
predators affect the population size of prey in two ways
the effect depends on wether the predator is selective or not. it is important to know the prey exchange rate - the rate at which prey moves in and out of an area. food chans are good for showing the feeding relationship in a habitat.
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