All of the above reasons contribute to the reduction of gene pools in small populations compared to larger populations. Inbreeding can lead to a decrease in genetic diversity and an increase in genetic disorders. A lack of suitable mates can limit the gene flow within the population. The absence of advantageous traits can make it more difficult for individuals in small populations to survive and reproduce. Bottleneck events, where a large portion of the population is suddenly reduced, can greatly decrease genetic diversity and limit the gene pool size.
