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Forest ecology is one branch of a biotically-oriented classification of types of ecological study (as opposed to a classification based on organizational level or complexity, for example population or community ecology).
In population ecology, a regulating factor is something that keeps a population at equilibrium (neither increasing nor decreasing in size over time).
Introduced in 1977 by Michael T. Hannan and the late John H. Freeman in their American Journal of Sociology piece "The population ecology of organizations" and later refined in their 1989 book Organizational Ecology, organizational ecology examines the environment in which organizations compete and a process like natural selection occurs.