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首页> 外文期刊>Conservation Biology >Population history, mating system, and fitness variation in a perennial herb with a fragmented distribution
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Population history, mating system, and fitness variation in a perennial herb with a fragmented distribution

机译：多年生草本植物的种群历史，交配系统和适应性变异，分布不均

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Patterns of genetic diversity are strongly influenced by the history of populations, which is often ignored when examining the viability of populations. We studied the relationship of population size, genetic variation, and fitness in the perennial herb Vincetoxicum hirundinaria ( Asclepiadaceae) in the southwestern archipelago of Finland, where this species occurs commonly on many of the islands and its distribution is highly fragmented. We measured the magnitude and distribution of genetic variation in this species to examine how patterns of genetic diversity reflect population history, especially the colonization pattern of the islands and the mating system. Additionally, we used the genetic data to interpret previous results that suggest that fitness variation among populations is not directly related to population size. We found a high level of genetic variation (H-e = 0.396) and a low level of genetic differentiation ( F-ST = 0.052) among the populations. In contrast to several rare plant species, the level of genetic variation ( H-e) was not correlated with population size or with male or female fitness of the plants. Our results also indicated that inbreeding is common in all populations regardless of their size ( mean F-IS = 0.460) but that it does not correlate significantly with male or female fitness traits. The observed patterns of genetic variation suggest that this species has a mixed mating system. Taken together, these results indicate that the studied populations are of recent common ancestry but may also have relatively high levels of current gene flow. The differences between our results and those from previous studies of rare plant species with a fragmented distribution pattern emphasize the importance of considering whether fragmentation is caused by recent human activities or whether it reflects a distribution pattern characteristic of the species when evaluating the conservation needs of the species.
机译：遗传多样性的模式在很大程度上受到种群历史的影响，而在检查种群的生存能力时常常会忽略这一点。我们研究了芬兰西南群岛多年生草本Vincetoxicum hirundinaria（Asclepiadaceae）种群大小，遗传变异和适应性之间的关系，该物种在许多岛屿上普遍存在，其分布高度分散。我们测量了该物种遗传变异的大小和分布，以检验遗传多样性的模式如何反映种群历史，尤其是岛屿和交配系统的殖民模式。此外，我们使用遗传数据解释了以前的结果，这些结果表明人群之间的适​​应度差异与人群规模没有直接关系。我们在人群中发现了高水平的遗传变异（H-e = 0.396）和低水平的遗传分化（F-ST = 0.052）。与几种稀有植物相比，遗传变异水平（H-e）与种群数量或植物的雄性或雌性不相关。我们的研究结果还表明，近亲繁殖在所有种群中都很常见，无论其大小如何（平均F-IS = 0.460），但与男性或女性的适应性状没有显着相关性。观察到的遗传变异模式表明该物种具有混合交配系统。综上所述，这些结果表明，所研究的种群具有最近的共同血统，但也可能具有相对较高水平的当前基因流。我们的研究结果与以前的研究（具有分散的分布模式的稀有植物物种）的研究结果之间的差异，强调了在评估保护区的保护需求时，考虑是否碎片化是由最近的人类活动引起的还是反映了该物种的分布模式特征的重要性。种类。

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