-Factors that influence the distrubution and abundance (population size) of organisms can be categorised as abiotic and biotic factors.
-Abiotic factors result from the non-living part of the environment, such as temperature or water supply. Biotic factors result from the living parts of the ecosystem, such as competition and predation
-Abiotic factors can vary greatly i habitat, forming different microclimates that are important in determining the distribution of a species within a habitat
-Biotic factors include food supply, predation, parasitism, disease, intraspecific and interspecific competition.
-In some cases, one particular factor has a very strong influence on population size. For example, if a predator depends on one species of prey for food, and if that predator kills mostly that prey, then the populations of one may be largerly determined by the other. This can result in repeated oscillations of the population sizes of both species
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