Female-biased introductions produce higher predicted population size and genetic diversity in simulations of a small, isolated tiger (Panthera tigris) population

Female-biased introductions significantly enhance population size and genetic diversity in small, isolated tiger populations. A study simulating the genetic trajectory of tigers in Thailand's Dong Phayayen-Khao Yai Forest Complex found that translocating females consistently improved allelic richness and heterozygosity compared to equal numbers of males. Without intervention, simulations predicted stark declines in genetic diversity—46.5% for allelic richness and 53.5% for heterozygosity. Frequent translocations (four females every generation or every other generation) were necessary to mitigate long-term losses. The research underscores the critical role of sex-biased introductions and frequent gene flow in preserving genetic diversity, offering actionable insights for tiger conservation efforts.

Ash, E., Cushman, S., Kaszta, Ż., Landguth, E., Redford, T., & Macdonald, D. W. (2023). Female-biased introductions produce higher predicted population size and genetic diversity in simulations of a small, isolated tiger (Panthera tigris) population. Scientific Reports, 13(1). https://doi.org/10.1038/s41598-023-36849-z