INBREEDING DEPRESSION VARIES WITH INVESTMENT IN SEX IN A FACULTATIVE PARTHENOGEN
INBREEDING DEPRESSION VARIES WITH INVESTMENT IN SEX IN A FACULTATIVE PARTHENOGEN
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DOI：
10.1111/j.1558-5646.2009.00707.x
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发表时间：
2009-09-01
期刊：
影响因子：
3.3
通讯作者：
Paczolt, Kimberly A.
中科院分区：
文献类型：
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作者：
Caceres, Carla E.;Hartway, Cynthia;Paczolt, Kimberly A.
兼性孤雌生殖菌的生殖模式允许在无性生殖阶段积累的隐性突变在有性生殖后被揭露。较长时间的无性繁殖会增加个体内有害突变的积累，通过竞争减少种群遗传多样性，并增加近亲交配的可能性。有文件证明，在有性生殖的投资不同的种群和克隆蚤pulicaria，我们问，如果这种变化是预测的近亲繁殖的抑郁症的水平在整个人口。在四个湖泊的人口，不同的性投资，我们提出了多个家庭（母亲，现场生产的女儿，实验室生产的女儿）高的食物和估计的健身减少在两个性产生的后代相对于母亲的基因型。近亲繁殖的个体比其田间产生的兄弟姐妹具有较低的适应性。近亲繁殖后代的健身减少的幅度增加，人口水平的性投资减少。然而，有一个健身减少后，在外地生产的女儿，这表明许多外地收集的母亲参与了异交交配。
The reproductive mode of facultative parthenogens allows recessive mutations that accumulate during the asexual phase to be unmasked following sexual reproduction. Longer periods of asexual reproduction should increase the accumulation of deleterious mutations within individuals, reduce population-level genetic diversity via competition and increase the probability of mating among close relatives. Having documented that the investment in sexual reproduction differs among populations and clones of Daphnia pulicaria, we ask if this variation is predictive of the level of inbreeding depression across populations. In four lake populations that vary in sex investment, we raised multiple families (mother, field-produced daughter, laboratory-produced daughter) on high food and estimated the fitness reduction in both sexually produced offspring relative to the maternal genotype. Inbred individuals had lower fitness than their field-produced siblings. The magnitude of fitness reduction in inbred offspring increased as population-level investment in sex decreased. However, there was less of a fitness reduction following sex in the field-produced daughters, suggesting that many field-collected mothers were involved in outcross mating.