Few studies have linked the origin of dispersed tree seeds with their post-dispersal fate. We show that habitat-dependent mortality in a pedunculate oak (Quercus roburL.) seedling cohort reshapes the effective fecundity of individual mother trees but has little effect on the cohort’s genetic diversity. Initial tree recruitment plays a key role in forest regeneration, yet little is known on how patterns of recruit mortality feed back on the fecundity of reproducing trees. To investigate how among-habitat variation in seedling arrival and survival alters initial patterns of genetic diversity and maternal reproductive success. We genotyped a pedunculate oak seedling cohort (n = 809) and monitored it over 3 years. The mother trees of 81% of the seedlings were identified through parentage analysis. Seedlings were assigned to one of three habitats (broadleaved forest, pine plantation, or open area). Broadleaved forest received most seedlings (≈ 65%) but their survival was reduced by a third compared with pine plantations or open areas. Thus, mother trees dispersing many descendants to broadleaved forest suffered a disproportionate reduction of their reproductive success. Genetic diversity did not vary among habitats, nor over the monitoring period. The quality of seed dispersal, in terms of delivery sites, can considerably influence the reproductive success of individual mother trees without affecting the overall genetic diversity of the recruits.

中文翻译：

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在不断扩大的橡树林中招募基因型 Quercus robur L. 幼苗群：栖息地的多样性、扩散和表现

很少有研究将分散的树木种子的起源与其传播后的命运联系起来。我们表明，有花梗橡树 (Quercus roburL.) 幼苗群体中的栖息地依赖性死亡率重塑了个体母树的有效繁殖力，但对群体的遗传多样性几乎没有影响。最初的树木补充在森林再生中起着关键作用，但关于招募死亡率的模式如何反馈繁殖树木的繁殖力知之甚少。调查幼苗到达和存活的栖息地间变异如何改变遗传多样性和母体繁殖成功的初始模式。我们对一个有花梗的橡树幼苗群体（n = 809）进行了基因分型，并对其进行了 3 年的监测。通过亲本分析确定了81%幼苗的母树。幼苗被分配到三个栖息地之一（阔叶林、松树种植园或开放区域）。阔叶林获得了大部分幼苗（≈ 65%），但与松树种植园或空地相比，它们的存活率降低了三分之一。因此，将许多后代分散到阔叶林中的母树的繁殖成功率不成比例地降低。遗传多样性在栖息地之间没有变化，在监测期间也没有变化。就交付地点而言，种子传播的质量可以显着影响单个母树的繁殖成功，而不会影响新兵的整体遗传多样性。将许多后代分散到阔叶林的母树的繁殖成功率大幅下降。遗传多样性在栖息地之间没有变化，在监测期间也没有变化。就交付地点而言，种子传播的质量可以显着影响单个母树的繁殖成功，而不会影响新兵的整体遗传多样性。将许多后代分散到阔叶林中的母树的繁殖成功率大幅下降。遗传多样性在栖息地之间没有变化，在监测期间也没有变化。就交付地点而言，种子传播的质量可以显着影响单个母树的繁殖成功，而不会影响新兵的整体遗传多样性。