Plant invasions have consistently been shown to cause significant reductions in the diversity of recipient plant communities; an effect that can cascade through ecosystems to impact the stocks and flows of nutrients and energy as well as the diversity of higher trophic levels. However, the manner in which invasive plants alter ecosystem functioning and trophic interactions is highly variable can occur through the direct effects of the invader's abundance and its indirect effects via changes in community diversity. Understanding the nature of these interactions between plant invasion, community diversity and ecosystem functioning can provide insight for ecosystem managers. We evaluated whether plant invasion alters the relationship between biodiversity and ecosystem function (BEF) by comparing BEF models that either include or subtract the diversity and function values associated with the invasive vine, Vincetoxicum rossicum. To do this, we (1) characterize V. rossicum within the functional trait space of the regional species pool, (2) assess how different components of plant biodiversity vary along a V. rossicum invasion gradient, and (3) examine how V. rossicum invasion affects BEF relationships and trophic interactions, both at the plot‐scale and incrementally along a site‐level invasion gradient. In general, we found that V. rossicum invasion was associated with significant declines in plant community diversity across a suite of biodiversity measures; a consequence of V. rossicum's functional trait structure (height and specific leaf area). We also found that V. rossicum invasion resulted in significantly greater productivity (i.e., dominance effects in the inclusion model), but also that the diversity of the remaining resident community was positively associated with productivity (i.e., niche complementarity in the subtraction model). Further, we observed that while the relationship between flower cover and pollinator diversity was positive for both the inclusion and subtraction models, this relationship was stronger in the absence of V. rossicum. Our findings suggest that while plant invasion can result in enhanced productivity via dominance effects, this comes at the cost of significant declines in diversity. However, it is also the case that remaining resident diversity can exhibit positive effects on multiple functions and support for higher trophic levels.

中文翻译：

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入侵优势和居民多样性：揭示植物入侵对生物多样性和生态系统功能的影响

一直以来都显示出植物的入侵会大大减少受体植物群落的多样性。这种影响可以在整个生态系统中级联，从而影响营养物质和能量的存量和流量以及较高营养水平的多样性。但是，入侵植物改变生态系统功能和营养相互作用的方式可以通过入侵者丰富度的直接影响和通过社区多样性变化的间接影响发生。了解植物入侵，社区多样性和生态系统功能之间的相互作用的性质可以为生态系统管理者提供见识。Vincetoxicum rossicum。为此，我们（1）在区域物种库的功能特征空间内表征蔷薇果（V. rossicum），（2）评估植物生物多样性的不同组成部分如何随蔷薇果（V. rossicum）入侵梯度而变化，以及（3）检查薇薇果（V. rossicum入侵会在地块范围和沿站点级别入侵梯度逐渐影响BEF关系和营养相互作用。总的来说，我们发现罗氏沼虾的入侵与一系列生物多样性措施中植物群落多样性的显着下降有关。的结果V. rossicum的官能性状结构（高度和比叶面积）。我们还发现罗氏沼虾入侵导致生产力显着提高（即，包含模型中的优势效应），但是剩余居民社区的多样性与生产力成正相关（即，减法模型中的生态位互补性）。此外，我们观察到，虽然包涵和减影模型的花覆盖度与传粉媒介多样性之间呈正相关关系，但在不存在蔷薇时，这种关系更强。我们的发现表明，虽然植物入侵可以通过以下方式提高生产力主导效应，这是以多样性显着下降为代价的。但是，也存在这样的情况，剩余的居民多样性可以对多种功能发挥积极作用并支持更高的营养水平。