A population bottleneck can be defined as the decreased in the size of population which may occur due to disaster , environmental factors or activities carried out by humans which in turn leads to reduction in population size.
Therefore INCREASED POPULATION SIZE is an events which could not be caused by a population bottleneck due to the fact that increase in population size leads to increase in the numbers of individuals or people in which this number of people can only be increased in size rather than decreased in size when been compare to population bottle neck which dramatically reduces the size of a population.
