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自相兼容的雌雄性牛的种群遗传结构是由漂移驱动的,独立于其当代的交配系统

Cansu Çetin^1,2,3, Jukka Jokela^1,2, Philine G D Feulner^4,5

¹Department of Aquatic Ecology Swiss Federal Institute of Aquatic Science and Technology Dübendorf Switzerland.

Ecology and evolution

|August 14, 2024

概括

遗传漂移,而不是交配系统,塑造了淡水牛的遗传多样性. 创始事件和小种群大小可能会影响Lymnaea stagnalis种群的遗传结构和限制多样性.

科学领域:

人口遗传学人口遗传学
进化生物学是进化的生物学.
分子生态学分子生态学

背景情况:

人口的遗传多样性是由诸如遗传漂移,基因流动和自然选择等因素所塑造的.
雌雄性动物的自我受精减少了异卵性和有效种群大小 (Ne),可能加速遗传漂移.
对于小群体来说,了解交配系统和遗传漂移之间的相互作用至关重要,特别是在创始人活动期间.

研究的目的:

研究遗传漂移和当代交配系统在Lymnaea stagnalis种群中塑造遗传多样性的作用.
检查有效种群大小 (Ne) 和Tajima的D值,以推断长期遗传漂移.
估计人口内部的自我交配率和对联关系,以反映当代的交配系统.

主要方法:

利用限制部位关联DNA (RAD) 测序,从五个Lymnaea stagnalis种群中获得4054个SNP标记.
分析了SNP数据以估计有效种群大小 (Ne) 和Tajima的D值.
计算了自我交配率和双相相关性,以表征当代的交配系统.

主要成果:

在研究的牛种群中观察到强大的种群遗传结构和遗传多样性的显著差异.
遗传多样性,Ne估计和Tajima的D值之间的共变表明遗传漂移是遗传结构的关键决定因素.
自杀率和相关性估计在不同种群中是相似的,这表明当代的交配系统没有显著地影响遗传结构或多样性.

结论:

遗传漂移,可能是由创始事件和/或小种群规模驱动的,是影响Lymnaea stagnalis.遗传结构和多样性的主要因素.
当代的交配系统,包括自我受精,似乎对观察到的遗传模式产生了有限的影响.
历史因素,如创始人事件期间的近亲繁殖,可能导致了这些种群的当前遗传构成.

关键词:

在RAD测序中使用RAD测序.遗传结构遗传结构亲生繁殖是一种繁殖方式.相关性关联性关联性小种群的小种群.

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