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Overstorey composition shapes across‐trophic level community relationships in deciduous forest regardless of fragmentation context
Journal of Ecology ( IF 5.5 ) Pub Date : 2020-12-27 , DOI: 10.1111/1365-2745.13580
Michael P. Perring 1, 2 , Lionel R. Hertzog 1, 3, 4 , Stefanie R. E. De Groote 1 , Daan Dekeukeleire 3 , Wouter Dekoninck 5 , Pallieter De Smedt 1 , Willem Proesmans 1 , Bram K. Sercu 1, 3 , Thiebe Sleeuwaert 3 , Johan Van Keer 6 , Irene M. Schrojenstein Lantman 3 , Pieter Vantieghem 3 , Lander Baeten 1 , Dries Bonte 3 , An Martel 7 , Kris Verheyen 1 , Luc Lens 3
Affiliation  

  1. Communities across trophic levels, and the functional roles they play, are vital for the sustained provision of ecosystem services. In forest systems, diversification of overstorey composition has been shown to be a key driver of biodiversity, but its influence on across‐trophic level relationships remains scarcely known. Species across trophic levels in varied overstorey compositions are also differentially susceptible to fragmentation context. We hypothesise that fragmentation will disrupt community relationships associated with particular overstorey compositions.
  2. We test this hypothesis using a tree diversity research platform across 53 deciduous woodland plots in central Belgium. We estimate species’ abundances within nine, generally taxonomic, community groups across trophic levels: understorey vegetation; leaf miners and gall formers; woodlice, millipedes; carabid beetles, harvestmen, spiders, birds, bats. We use multiple co‐inertia analyses to examine how taxonomic and trophic role community matrices covary across gradients of overstorey composition, via three different tree species diversification pathways, and fragmentation.
  3. For all trophic role groups, across all plots, there was at least one significant pairwise comparison. Apart from comparisons involving bats, there was at least one significant pairwise correlation between taxonomic groups too. These results indicate correlated community matrices across trophic levels. Overstorey composition related to community tightness, that is, the level of co‐ordinated change among taxonomic and/or trophic role groups as revealed by multiple co‐inertia analyses. Notably, diversifying woodlands of beech Fagus sylvatica or red oak Quercus rubra with pedunculate oak Quercus robur correlated with increased taxonomic community tightness. Diversifying pedunculate oak forest stands with other overstorey species related to unchanged community tightness. Evidence was lacking for fragmentation affecting community tightness, singly or by interacting with overstorey composition.
  4. Synthesis. Overall, changing tree species composition and fragmentation level affected across‐trophic level community relationships differently. Yet, we demonstrated a clear signal that diversifying monoculture stands with particular species correlated with greater community tightness, and co‐ordinated change among sets of community groups, across trophic levels and regardless of fragmentation context. We postulate that having tighter community relationships suggests that measures to improve biodiversity at one trophic level (i.e. trees) could affect other groups, and their associated roles, in a co‐ordinated manner.


中文翻译:

不论碎片背景如何,落叶林中的高营养成分影响着整个营养层的社区关系

  1. 营养级别的社区及其所扮演的功能性角色,对于持续提供生态系统服务至关重要。在森林系统中,已表明过分组成的多样化是生物多样性的主要驱动力,但其对跨营养级关系的影响仍然鲜为人知。在不同的过高成分中,营养级别不同的物种也容易受到碎片环境的影响。我们假设,支离破碎将破坏与特定的超高层建筑相关的社区关系。
  2. 我们使用树木多样性研究平台在比利时中部的53个落叶林地中验证了这一假设。我们估计了在营养级别上的9个(通常是生物分类的)社区群体内的物种丰度:低层植被;叶矿工和胆鬼;木虱,千足虫;甲虫,收割者,蜘蛛,鸟类,蝙蝠。我们使用多种协惯性分析,通过三种不同的树种多样化途径和碎片化方法,研究了分类学和营养学角色群落矩阵如何跨过地层成分的梯度变化。
  3. 对于所有营养角色组,在所有情节中,至少存在一个显着的成对比较。除了涉及蝙蝠的比较之外,分类组之间也至少存在一对显着的成对相关性。这些结果表明了在营养级别上相关的社区矩阵。多层结构与社区的紧张程度有关,也就是说,通过多重惯性分析揭示了分类和/或营养角色组之间协调变化的程度。值得注意的是,山毛榉Fagus sylvatica或红橡木栎栎与有花梗橡木栎栎的林地多样化与增加分类学社区的紧密度相关。有花序的橡木林和其他与群落密闭性未改变有关的超高树种使林分多样化。缺乏单独或通过与高楼层建筑相互作用而影响社区封闭性的支离破碎的证据。
  4. 综合。总体而言,不断变化的树种组成和破碎水平对不同营养水平的社区关系的影响不同。然而,我们证明了一个明确的信号,即单一营养的多样化与特定物种有关,这与更大的社区紧密度以及在营养级别和不考虑分裂背景的社区群体之间的协调变化相关。我们推测,建立更紧密的社区关系表明,在一个营养级别(即树木)上改善生物多样性的措施可能会以协调的方式影响其他群体及其相关角色。
更新日期:2020-12-27
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