Genetic diversity and differentiation follow secondary succession in a multi-species study on woody plants from subtropical China
Genetic diversity and differentiation follow secondary succession in a multi-species study on woody plants from subtropical China
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DOI：
10.1093/jpe/rtw054
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发表时间：
2017-02-01
影响因子：
2.7
通讯作者：
Durka, Walter
中科院分区：
文献类型：
--
作者：
Hahn, Christoph Z.;Michalski, Stefan G.;Durka, Walter
物种多样性和遗传多样性可能会受到类似环境驱动因素的影响。然而，遗传多样性也可能受到生境特征的独立影响。方法利用微卫星标记对古田山27个样地的11种优势乔木和灌木物种的遗传多样性（A（r））和种群分化（F '（ST））进行了研究。我们测试，如果Ar和人口特定的F '（ST）与当地物种多样性和地块特征。多模型推断和模型平均用于确定每个预测因子的相对重要性。此外，我们测试隔离距离（IBD）和隔离海拔回归成对F '（ST）对成对的空间和海拔distances.Important FindingsGenetic Diversity是不相关的物种多样性的任何研究物种。因此，我们的结果不支持栖息地特征对这两个水平的生物多样性的联合影响。相反，遗传多样性在两个林下灌木，杜鹃花和越橘米，受情节年龄的遗传多样性下降，连续老情节。随着样地年龄的增长，种群分化程度增加。simsii和石栎Lithocarpus glaber。这表明演替可以减少种群内的遗传多样性，增加种群间的遗传多样性。此外，我们还发现了4例IBD和2例因海拔升高而隔离的病例。前者表明动物传播花粉和种子的效率低下，而后者可能是由于物候的影响。这些模式表明，演替可以影响遗传多样性，而不会对物种多样性产生平行影响，即使在局部范围内，连续的亚热带森林中的基因流也会受到限制。
AimsSpecies diversity and genetic diversity may be affected in parallel by similar environmental drivers. However, genetic diversity may also be affected independently by habitat characteristics. We aim at disentangling relationships between genetic diversity, species diversity and habitat characteristics of woody species in subtropical forest.MethodsWe studied 11 dominant tree and shrub species in 27 plots in Gutianshan, China, and assessed their genetic diversity (A(r)) and population differentiation (F'(ST)) with microsatellite markers. We tested if Ar and population specific F'(ST) were correlated to local species diversity and plot characteristics. Multi-model inference and model averaging were used to determine the relative importance of each predictor. Additionally, we tested for isolation-by-distance (IBD) and isolation-by-elevation by regressing pairwise F'(ST) against pairwise spatial and elevational distances.Important FindingsGenetic diversity was not related to species diversity for any of the study species. Thus, our results do not support joint effects of habitat characteristics on these two levels of biodiversity. Instead, genetic diversity in two understory shrubs, Rhododendron simsii and Vaccinium carlesii, was affected by plot age with decreasing genetic diversity in successionally older plots. Population differentiation increased with plot age in R. simsii and Lithocarpus glaber. This shows that succession can reduce genetic diversity within, and increase genetic diversity between populations. Furthermore, we found four cases of IBD and two cases of isolation-by-elevation. The former indicates inefficient pollen and seed dispersal by animals whereas the latter might be due to phenological asynchronies. These patterns indicate that succession can affect genetic diversity without parallel effects on species diversity and that gene flow in a continuous subtropical forest can be restricted even at a local scale.