Escaping bottlenecks: The demographic path to genetic recovery in koalas (Phascolarctos cinereus) · C. W. Ahrens et al.
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Collin W. Ahrens1*, Adam D. Miller1,2, Luke W. Silver3,4, Elspeth A. McLennan3, Carolyn J. Hogg3, Andrew R. Weeks1,5 Population bottlenecks can lead to evolutionary dead ends by eroding genetic diversity and intensifying inbreeding. Although theory predicts possible escape routes, direct observations of this process are rare. Using whole-genome data from 418 koalas, we found that populations with higher genetic diversity harbored the greatest mutational loads and had declining effective population sizes (Ne), whereas historically bottlenecked but recovering populations displayed reduced mutational load, exhibited increasing Ne, and regenerated new, rare variants. We concluded that this pattern was due to rapid demographic expansion, which reshuffled genetic variation through recombination and affected Ne more quickly than it did conventional diversity metrics. …
摘自《科学》(Science)第391卷 第6789期 · 2026年3月5日,C. W. Ahrens et al.。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。