The genetic contribution of single male immigrants to small, inbred populations:: a laboratory study using Drosophila melanogaster
The genetic contribution of single male immigrants to small, inbred populations:: a laboratory study using Drosophila melanogaster
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DOI：
10.1046/j.1365-2540.2000.00721.x
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发表时间：
2000-06-01
期刊：
影响因子：
3.8
通讯作者：
Keller, MA
中科院分区：
文献类型：
--
作者：
Ball, SJ;Adams, M;Keller, MA
本研究考察了单个雄性移民对小的、近亲繁殖的黑腹果蝇实验室种群的遗传贡献。通过测量移民后第一代和第二代移民标记等位基因的相对频率来评估遗传贡献，同时控制标记位点的任何选择效应，以及男性移民的经验。当移民近交时，移民等位基因的平均频率在移民后的第一代和第二代都显著高于其初始频率。在接受近交移民的人群中，等位基因频率没有显著变化。近交移民等位基因频率的增加归因于移民男性在近交抑郁时的初始近交活力适合度优势。移民后代的杂交活力和罕见雄效应对移民等位基因的适合度优势没有统计学意义。结果表明，近交可能对移民对种群遗传多样性的贡献有相当大的影响。
This study examined the genetic contribution of single male immigrants to small, inbred laboratory populations of Drosophila melanogaster. Genetic contribution was assessed by measuring the relative frequency of immigrant marker alleles in the first and second generations after immigration, while controlling for any selection effects at the marker locus, and for the experience of male immigrants. When immigrants were outbred, the mean frequency of the immigrant allele was significantly higher than its initial frequency, in both the first and second generations after immigration. There was no significant change in allele frequency for populations receiving inbred immigrants. The increase in allele frequency for outbred immigrants was attributed to an initial outbred vigour fitness advantage of immigrant males over resident males experiencing inbreeding depression. Hybrid vigour of immigrant progeny and the rare-male effect did not have a statistically significant role in the fitness advantage of the immigrant allele. The results suggest that inbreeding may have a considerable impact on the contribution of immigrants to the genetic diversity of populations.