Corentin Gaudichet, Sabine Greulich, Séraphine Grellier, Philippe Janssen, Stéphane Rodrigues
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We hypothesized that fewer resources would increase the stress-tolerant prevalence (i.e., community-weighted mean value), while topographic gradients would affect ruderal prevalence. In addition, we hypothesized that strong and directional environmental filtering should reduce the co-occurrence of species with different CSR strategy values (i.e., low C, S and R functional dispersion).</p>\n </section>\n \n <section>\n \n <h3> Location</h3>\n \n <p>Fourteen side channels on the lower reach of the Loire river (France).</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>Taxonomic composition of the herb layer and environmental variables were assessed on 474 plots. The relations between species composition and environmental gradients were investigated by a constrained analysis of principal coordinates. The effects of environmental gradients on community CSR strategies were assessed using mixed-effects models and a model-averaging procedure.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>Taxonomic community composition was shaped mainly by light availability, topographic elevation and sediment grain size. Slope and the interaction between light and elevation influenced the community-weighted mean and functional dispersion values of S and R strategies. Among other interactions, those involving sediment grain size shaped the dispersion values for C and R strategies.</p>\n </section>\n \n <section>\n \n <h3> Conclusion</h3>\n \n <p>The study identified shading and fine sediment grain size as key drivers of biotic homogenization in the riverscape. Increasing the disturbance frequency and magnitude would limit the progression of the ecological succession and favor the co-occurrence of taxonomically and functionally diverse communities within the side channels.</p>\n </section>\n </div>","PeriodicalId":49965,"journal":{"name":"Journal of Vegetation Science","volume":"35 1","pages":""},"PeriodicalIF":2.2000,"publicationDate":"2024-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jvs.13227","citationCount":"0","resultStr":"{\"title\":\"Influence of local environmental gradients on ecological strategies of herbaceous communities in riverine side channels\",\"authors\":\"Corentin Gaudichet, Sabine Greulich, Séraphine Grellier, Philippe Janssen, Stéphane Rodrigues\",\"doi\":\"10.1111/jvs.13227\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n \\n <section>\\n \\n <h3> Questions</h3>\\n \\n <p>In riverine side channels (secondary and former arms), the alternation of lotic, lentic and dry phases produces disturbance and resource gradients that filter species and community strategies. To better understand the impact of this alternation of functioning on plant communities at a fine spatial scale, we tested for the effects of elevation (linked to water level), slope, longitudinal position, light availability and sediment grain size on (i) taxonomic composition and (ii) competition, stress tolerance, and ruderal strategies (C, S and R strategies) at the community level. We hypothesized that fewer resources would increase the stress-tolerant prevalence (i.e., community-weighted mean value), while topographic gradients would affect ruderal prevalence. In addition, we hypothesized that strong and directional environmental filtering should reduce the co-occurrence of species with different CSR strategy values (i.e., low C, S and R functional dispersion).</p>\\n </section>\\n \\n <section>\\n \\n <h3> Location</h3>\\n \\n <p>Fourteen side channels on the lower reach of the Loire river (France).</p>\\n </section>\\n \\n <section>\\n \\n <h3> Results</h3>\\n \\n <p>Taxonomic composition of the herb layer and environmental variables were assessed on 474 plots. The relations between species composition and environmental gradients were investigated by a constrained analysis of principal coordinates. The effects of environmental gradients on community CSR strategies were assessed using mixed-effects models and a model-averaging procedure.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Results</h3>\\n \\n <p>Taxonomic community composition was shaped mainly by light availability, topographic elevation and sediment grain size. 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引用次数: 0
摘要
问题 在河流边沟（次支流和前支流）中，荷相、泻相和干相的交替产生了干扰和资源梯度，从而过滤了物种和群落策略。为了更好地了解这种功能交替在精细空间尺度上对植物群落的影响，我们测试了海拔（与水位相关）、坡度、纵向位置、光照可用性和沉积物粒径对以下方面的影响：(i) 分类组成；(ii) 群落水平上的竞争、压力耐受性和粗放策略（C、S 和 R 策略）。我们假设，较少的资源将增加耐压性的流行率（即群落加权平均值），而地形梯度将影响粗放策略的流行率。此外，我们还假设，强烈的定向环境过滤应减少具有不同 CSR 策略值（即低 C、S 和 R 功能分散性）的物种的共同出现。 地点 卢瓦尔河（法国）下游的 14 条支渠。 结果 对 474 块地的草本植物层的分类组成和环境变量进行了评估。通过限制性主坐标分析研究了物种组成与环境梯度之间的关系。利用混合效应模型和模型平均程序评估了环境梯度对群落 CSR 策略的影响。 结果 分类群落组成主要受光照、地形海拔和沉积物粒度的影响。坡度以及光照和海拔之间的相互作用影响了群落加权平均值以及 S 和 R 策略的功能分散值。在其他相互作用中，涉及沉积物粒度的相互作用影响了 C 和 R 策略的离散值。 结论 该研究发现，遮光和细沉积物粒度是河流景观中生物同质化的主要驱动因素。增加干扰的频率和强度将限制生态演替的进展，并有利于分类和功能多样化群落在侧河道中的共存。
Influence of local environmental gradients on ecological strategies of herbaceous communities in riverine side channels
Questions
In riverine side channels (secondary and former arms), the alternation of lotic, lentic and dry phases produces disturbance and resource gradients that filter species and community strategies. To better understand the impact of this alternation of functioning on plant communities at a fine spatial scale, we tested for the effects of elevation (linked to water level), slope, longitudinal position, light availability and sediment grain size on (i) taxonomic composition and (ii) competition, stress tolerance, and ruderal strategies (C, S and R strategies) at the community level. We hypothesized that fewer resources would increase the stress-tolerant prevalence (i.e., community-weighted mean value), while topographic gradients would affect ruderal prevalence. In addition, we hypothesized that strong and directional environmental filtering should reduce the co-occurrence of species with different CSR strategy values (i.e., low C, S and R functional dispersion).
Location
Fourteen side channels on the lower reach of the Loire river (France).
Results
Taxonomic composition of the herb layer and environmental variables were assessed on 474 plots. The relations between species composition and environmental gradients were investigated by a constrained analysis of principal coordinates. The effects of environmental gradients on community CSR strategies were assessed using mixed-effects models and a model-averaging procedure.
Results
Taxonomic community composition was shaped mainly by light availability, topographic elevation and sediment grain size. Slope and the interaction between light and elevation influenced the community-weighted mean and functional dispersion values of S and R strategies. Among other interactions, those involving sediment grain size shaped the dispersion values for C and R strategies.
Conclusion
The study identified shading and fine sediment grain size as key drivers of biotic homogenization in the riverscape. Increasing the disturbance frequency and magnitude would limit the progression of the ecological succession and favor the co-occurrence of taxonomically and functionally diverse communities within the side channels.
期刊介绍：
The Journal of Vegetation Science publishes papers on all aspects of plant community ecology, with particular emphasis on papers that develop new concepts or methods, test theory, identify general patterns, or that are otherwise likely to interest a broad international readership. Papers may focus on any aspect of vegetation science, e.g. community structure (including community assembly and plant functional types), biodiversity (including species richness and composition), spatial patterns (including plant geography and landscape ecology), temporal changes (including demography, community dynamics and palaeoecology) and processes (including ecophysiology), provided the focus is on increasing our understanding of plant communities. The Journal publishes papers on the ecology of a single species only if it plays a key role in structuring plant communities. Papers that apply ecological concepts, theories and methods to the vegetation management, conservation and restoration, and papers on vegetation survey should be directed to our associate journal, Applied Vegetation Science journal.
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