Uyenoyama Marcy K
Department of Biology, Duke University, P.O. Box 90338, Durham, NC 27708-0338, USA.
Genes (Basel). 2024 Dec 20;15(12):1635. doi: 10.3390/genes15121635.
BACKGROUND/OBJECTIVES: Systems of reproduction differ with respect to the magnitude of neutral genetic diversity maintained in a population. In particular, the partitioning of reproductive organisms into mating types and regular inbreeding have long been recognized as key factors that influence effective population number. Here, a range of reproductive systems are compared with respect to the maintenance of neutral genetic diversity. This study addresses full gonochorism, full hermaphroditism, androdioecy (male and hermaphroditic reproductives), and gynodioecy (female and hermaphroditic reproductives).
Coalescence theory is used to determine the level of diversity maintained under each mating system considered.
For each mating system, the nature of the dependence of the level of neutral diversity on inbreeding depression, sex-specific viability, and other factors is described. In particular, the models account for the effects of sex-specific viability on the evolutionarily stable sex ratio and the collective contribution of each mating type (sex) to the offspring generation.
Within the context of conservation biology, population genetic and quantitative genetic theory has addressed the determination of the target minimum effective population size. In contrast, this study proposes and explores a summary statistic (a ratio of effective numbers) as a means of characterizing the context in which evolution occurs.
背景/目的：繁殖系统在种群中维持的中性遗传多样性程度方面存在差异。特别是，将生殖生物划分为交配型和常规近亲繁殖长期以来一直被认为是影响有效种群数量的关键因素。在此，就中性遗传多样性的维持对一系列繁殖系统进行了比较。本研究涉及完全雌雄异体、完全雌雄同体、雄花两性花同株（雄性和两性生殖体）以及雌花两性花同株（雌性和两性生殖体）。
采用溯祖理论来确定在所考虑的每种交配系统下维持的多样性水平。
针对每种交配系统，描述了中性多样性水平对近亲繁殖衰退、性别特异性生存力及其他因素的依赖性质。特别是，这些模型考虑了性别特异性生存力对进化稳定性别比的影响以及每种交配型（性别）对后代世代的集体贡献。
在保护生物学背景下，种群遗传学和数量遗传学理论已涉及目标最小有效种群大小的确定。相比之下，本研究提出并探索了一种汇总统计量（有效数量之比），作为表征进化发生背景的一种手段。
