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首页> 外文期刊>Evolution Letters >Immigration counter‐acts local micro‐evolution of a major fitness component: Migration‐selection balance in free‐living song sparrows
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Immigration counter‐acts local micro‐evolution of a major fitness component: Migration‐selection balance in free‐living song sparrows

机译：移民反恐局部微观演进主要健身组分：自由生活歌曲麻雀的迁移选择余额

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Ongoing adaptive evolution, and resulting "evolutionary rescue" of declining populations, requires additive genetic variation in fitness. Such variation can be increased by gene flow resulting from immigration, potentially facilitating evolution. But, gene flow could in fact constrain rather than facilitate local adaptive evolution if immigrants have low additive genetic values for local fitness. Local migration-selection balance and micro-evolutionary stasis could then result. However, key quantitative genetic effects of natural immigration, comprising the degrees to which gene flow increases the total local additive genetic variance yet counteracts local adaptive evolutionary change, have not been explicitly quantified in wild populations. Key implications of gene flow for population and evolutionary dynamics consequently remain unclear. Our quantitative genetic analyses of long-term data from free-living song sparrows (Melospiza melodia) show that mean breeding value for local juvenile survival to adulthood, a major component of fitness, increased across cohorts more than expected solely due to drift. Such micro-evolutionary change should be expected given nonzero additive genetic variance and consistent directional selection. However, this evolutionary increase was counteracted by negative additive genetic effects of recent immigrants, which increased total additive genetic variance but prevented a net directional evolutionary increase in total additive genetic value. These analyses imply an approximate quantitative genetic migration-selection balance in a major fitness component, and hence demonstrate a key mechanism by which substantial additive genetic variation can be maintained yet decoupled from local adaptive evolutionary change.? 2021 The Authors. Evolution Letters published by Wiley Periodicals LLC on behalf of Society for the Study of Evolution (SSE) and European Society for Evolutionary Biology (ESEB).
机译：持续的自适应演化，并导致群体下降的“进化救援”需要适应性的遗传变异。通过移民产生的基因流动可以增加这种变异，可能促进进化。但是，如果移民对局部适应性低的添加剂遗传值，则基因流程可能会限制而不是促进局部适应性。然后，将导致本地迁移选择平衡和微进化瘀滞。然而，天然移民的关键定量遗传效应，包括基因流量增加的局部局部添加剂遗传方差尚未抵消局部适应性进化变化，尚未在野生种群中明确定量。因此，基因流动对群体和进化动力学的关键影响尚不清楚。我们的定量遗传分析来自自由生活歌曲麻雀（Melospiza Melodia）的长期数据表明，本地少年存活至成年期的平均育种价值，适应性的主要成分，跨越群体的增加而不是由于漂移的预期。如果非零添加遗传方差和一致的方向选择，则应预期这种微进化变化。然而，这种进化的增加因近期移民的阴性添加剂遗传效应而抵消，这增加了总添加剂遗传方差，但防止了总添加剂遗传值的净定向进化增加。这些分析意味着主要的健身组分中的近似定量遗传迁移选择平衡，因此证明了可以维持大量添加剂遗传变异且与局部适应性进化变化分离的关键机制。 2021作者。 Wiley期刊LLC发布的演变信函代表进化（SSE）和欧洲进化生物学学会研究（ESEB）。

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