EXTINCTION OF SMALL POPULATIONS IN THE BIT-STRING MODEL OF BIOLOGICAL AGEING

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Abstract
In the framework of the bit-string model of biological ageing we show that the survival chance of a small population in an environment of limited carrying capacity grows exponentially with the size of the habitat. Extinction is usually preceded by a gradual decline of the genetic condition of the population. With death due to senescence coming earlier, the typical population size shrinks, and at some stage the population dies out due to the fluctuations.

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