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Species richness and phylogenetic structure in plant communities: 20 years of succession
Web Ecology ( IF 2.2 ) Pub Date : 2017-08-15 , DOI: 10.5194/we-17-37-2017
Jutta Stadler , Stefan Klotz , Roland Brandl , Sonja Knapp

Abstract. Secondary succession on arable fields is a popular system for studying processes influencing community assembly of plants. During early succession, the arrival and establishment of those propagules that can pass the environmental filters operating at a given site should be among the dominant processes leading to an initial increase in species richness. With ongoing succession, environmental filtering should decrease in relative importance compared to competitive interactions, which then should decrease species richness. Thereby, the phylogenetic structure of communities should change from random or clustered patterns during early succession to overdispersion. Disturbance is supposed to act as an additional filter, causing communities to be phylogenetically clustered. By analysing the species richness and phylogenetic structure of secondary succession in two different regions in Germany with three different disturbance levels each, we tested this general model. Although in one of the regions (Gimritz) we found the expected trajectory of species richness, phylogenetic structure did not follow the expected trend from random or clustered towards overdispersed communities. In the other region (Bayreuth), species richness did not follow the expected trajectory and phylogenetic structure remained clustered over the course of succession. A preliminary analysis of autecological characteristics of the species involved (Ellenberg indicator values) nevertheless showed clear contrasting trends. The idiosyncrasies of successional trajectories across sites might be due to the environmental context, the regional species pool as well as the legacy of former land use reflected in the seed bank.

中文翻译:

植物群落的物种丰富度和系统发育结构:20 年的演替

摘要。可耕地的次生演替是研究影响植物群落组装过程的流行系统。在早期演替期间,那些能够通过在特定地点运行的环境过滤器的繁殖体的到达和建立应该是导致物种丰富度初始增加的主要过程之一。随着持续的演替,与竞争性相互作用相比,环境过滤的相对重要性应该会降低,然后会降低物种丰富度。因此,群落的系统发育结构应从早期演替期间的随机或聚集模式转变为过度分散。干扰应该作为一个额外的过滤器,导致群落在系统发育上聚集。通过分析德国两个不同区域的物种丰富度和次生演替的系统发育结构,每个区域具有三个不同的干扰水平,我们测试了这个通用模型。尽管在其中一个区域 (Gimritz) 中,我们发现了物种丰富度的预期轨迹,但系统发育结构并未遵循从随机或聚集到过度分散的群落的预期趋势。在另一个地区(拜罗伊特),物种丰富度没有遵循预期的轨迹,系统发育结构在演替过程中仍然聚集。然而,对所涉物种的自产学特征(Ellenberg 指标值)的初步分析显示出明显的对比趋势。跨站点连续轨迹的特性可能是由于环境背景,
更新日期:2017-08-15
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