Data from: Functional responses of multi-taxa communities to disturbance and stress gradients in a restored floodplain

1. Trait-based approaches can reveal the mechanisms through which disturbances or stress impact communities, allowing comparisons of the role of different mechanisms in shaping communities among taxonomic groups. Such information can lead to higher comparability, transferability and predictability of the outcome of restoration projects. However, multitaxa trait-based approaches were rarely used in the context of ecosystem restoration. 2. We investigated the responses to environmental gradients of seven taxa (vascular plants, staphylinid and carabid beetles, spiders, isopods, diplopods and earthworms) in a restored floodplain using a species traits approach. We assessed the impact of flood disturbances and soil hydric stress on the functional diversity (FD) and community-weighted mean (CWM) response of traits for each taxon. 3. Ordination of hydrological variables revealed two main gradients. The first was related to the spatiotemporal dynamics of flood disturbances and the second to the average changes in soil hydric conditions. 4. The analysis of CWM revealed that larger, poorly mobile species with narrow ecological tolerances were filtered by regular floods and/or changes in soil hydric conditions. 5. Functional diversity patterns differed between the two gradients: decreasing with increasing flood disturbance, but increasing along the soil hydric stress gradient. This suggests that the mechanisms shaping community composition differ between the two gradients with environmental filtering being dominant with increasing flood disturbances and competition decreasing with more soil hydric stress. 6. Synthesis and applications. Our study shows that the impact of restored flood disturbances and soil hydric stress on plant and invertebrate functional diversity and community-weighted mean can be positive, negative or more complex depending on the taxonomic group and environmental gradient considered. The patterns can to some extent be explained by the specific characteristics of each group. Larger, poorly mobile species with narrow ecological tolerances were particularly vulnerable to changes in disturbance and stress regime following floodplain restoration. These species may therefore be lost in the initial phases of restoration projects, but other more characteristic species of dynamic floodplains will be favoured. Understanding the consequences of these contrasted responses for biodiversity conservation and ecosystem functioning constitutes the next challenge for ecosystem restoration.1. 基于性状的研究方法（Trait-based approaches）能够揭示干扰或胁迫影响群落的内在机制，从而实现不同分类群间塑造群落的各类机制的作用对比。此类信息可提升修复项目结果的可比性、可迁移性与可预测性。然而，多类群性状研究方法极少应用于生态系统修复场景中。 2. 我们采用物种性状研究方法，在一处恢复中的泛滥平原中探究了7个分类群——维管植物（vascular plants）、隐翅虫科甲虫（staphylinid beetles）、步甲科甲虫（carabid beetles）、蜘蛛（spiders）、等足类（isopods）、倍足类（diplopods）与蚯蚓（earthworms）——对环境梯度的响应。我们评估了洪水干扰与土壤水分胁迫对各分类群的功能多样性（functional diversity, FD）与性状的群落加权平均（community-weighted mean, CWM）响应的影响。 3. 水文变量的排序分析揭示了两条主要环境梯度：第一条与洪水干扰的时空动态相关，第二条则与土壤水分条件的平均变化相关。 4. 对群落加权平均的分析显示，体型更大、移动能力较弱且生态耐受性较窄的物种，会受到周期性洪水与/或土壤水分条件变化的过滤作用。 5. 功能多样性的变化模式在两条梯度间存在显著差异：随洪水干扰程度加剧而降低，但随土壤水分胁迫梯度升高而上升。这表明塑造群落组成的机制在两条梯度间存在差异：随着洪水干扰加剧，环境过滤作用占据主导；而随着土壤水分胁迫程度提升，种间竞争作用则会减弱。 6. 总结与应用。本研究表明，恢复后的洪水干扰与土壤水分胁迫对植物和无脊椎动物的功能多样性及群落加权平均的影响，可依据所关注的分类群与环境梯度的不同，呈现正向、负向或更为复杂的模式。此类模式在一定程度上可通过各分类群的特有特征加以解释。体型更大、移动能力较弱且生态耐受性较窄的物种，在泛滥平原恢复后，对干扰与胁迫状况的脆弱性尤为突出。因此这类物种可能在修复项目的初始阶段出现流失，但更适配动态泛滥平原的特有物种将获得生存优势。明确这些差异化响应对生物多样性保护与生态系统功能的影响，是生态系统修复领域接下来的研究挑战。