The regular fluctuations in the size of animal populations are termed as population cycle. There are four types of population fluctuation i.e. irregular, cyclic, stable, and irruptive.
A Population may be defined as the number of individuals of the same species living in the same area at a given time.
The population cycle determines the fluctuation in the given population. It estimates the number of individuals of the same species at a given interval of time.
Therefore, the regular fluctuations in the size of animal populations are termed as population cycle.
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