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首页> 外文期刊>Evolution: International Journal of Organic Evolution >Sex-specific additive genetic variances and correlations for fitness in a song sparrow (Melospiza melodia) population subject to natural immigration and inbreeding
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Sex-specific additive genetic variances and correlations for fitness in a song sparrow (Melospiza melodia) population subject to natural immigration and inbreeding

机译：宋雀（Melospiza Melodia）人群受到自然移民和近亲繁殖的性能特异性添加剂遗传差异和相关性

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摘要

Quantifying sex-specific additive genetic variance (V_A) in fitness, and the cross-sex genetic correlation (r_A), is prerequisite to predicting evolutionary dynamics and the magnitude of sexual conflict. Further, quantifying V_A and r_A in underlying fitness components, and genetic consequences of immigration and resulting gene flow, is required to identify mechanisms that maintain V_A in fitness. However, these key parameters have rarely been estimated in wild populations experiencing natural environmental variation and immigration. We used comprehensive pedigree and life-history data from song sparrows (Melospiza melodia) to estimate V_A and r_A in sex-specific fitness and underlying fitness components, and to estimate additive genetic effects of immigrants alongside inbreeding depression. We found evidence of substantial V_A in female and male fitness, with a moderate positive crosssex r_A. There was also substantial V_A in male but not female adult reproductive success, and moderate V_A in juvenile survival but not adult annual survival. Immigrants introduced alleles with negative additive genetic effects on local fitness, potentially reducing population mean fitness through migration load, but alleviating expression of inbreeding depression. Our results show that V_A for fitness can be maintained in the wild, and be broadly concordant between the sexes despite marked sex-specific V_A in reproductive success.
机译：定量性别性的添加剂遗传方差（V_A）在健身和交叉性遗传相关（R_A）是预测进化动态的先决条件和性冲突的程度。此外，需要在底层的健身组分中定量V_A和R_A，以及移民的遗传后果和产生的基因流动，以识别维持体内v_a的机制。然而，这些关键参数很少估计在经历自然环境变异和移民的野生人口中。我们使用了宋雀斑（Melospiza Melodia）的综合血统和生命历史数据来估计性别特定健身和潜在的健身部件中的V_A和R_A，并估计移民的添加剂遗传效应以及近亲繁殖的抑郁症。我们发现了女性和男性健身中实质性V_A的证据，具有中度的正交r_a。男性但不是女性成人生殖成功的实质性V_A，少年存活中适中的V_A，但没有成年生存。移民引入了对局部适应性的阴性添加剂遗传效应的等位基因，可能通过迁移载荷降低群体平均值，但减轻了近亲繁殖的抑郁症的表达。我们的结果表明，v_a适合健身可以在野外维持，并且尽管生殖成功的性别特异性V_A具有明显的性别v_a，但性别之间的态度很大。

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