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Taxonomic sufficiency and the influence of rare species on variation partitioning analysis of a polychaete community

机译：分类学上的充分性和稀有物种对多毛动物群落变异分区分析的影响

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摘要

Variation partitioning is an important tool to investigate the importance of spatial structure to species distribution in communities, but its use is lacking in marine ecosystems. The influence of rare species and the level of taxonomic resolution are important features to be considered when planning sampling designs and efforts for community studies. We tested the significance of spatial and environmental components to species distribution of a polychaete community, considering how the results varied among models with increasingly rare species (and contrasting metrics), and among models with distinct taxonomic levels. For all models evaluated, both spatial and environmental components significantly explained the structure of species distribution. However, spatial processes explained a higher percentage of variance than environmental ones in almost all models. The inclusion of rare species did not influence the outcome in most models, with the exception of a Chi-square distance model with all species included. Family taxonomic level was sufficient to detect the relative contribution of both components, but the number of environmental variables included in the model was higher for the genus level. The influence of rare species was related to the metric applied to the analysis. If weight to rare species is not desirable, the use of a few dominant species coupled with the Hellinger function can provide a good surrogate to the whole sampled community in variation partition analysis. The genus level is suggested as an appropriate taxonomic level with which to evaluate the relevance of spatial and environmental components in polychaete community studies.
机译：变异分区是研究空间结构对社区物种分布的重要性的重要工具，但是在海洋生态系统中却缺乏这种用途。稀有物种的影响和分类学解决方案的水平是计划抽样设计和社区研究工作时应考虑的重要特征。我们测试了空间和环境成分对多毛动物群落物种分布的重要性，考虑到结果在稀有物种越来越多的模型（以及对比指标）以及具有不同分类标准的模型之间如何变化。对于评估的所有模型，空间和环境成分都可以很好地解释物种分布的结构。但是，在几乎所有模型中，空间过程都比环境过程解释了更高的方差百分比。在大多数模型中，稀有物种的加入均不影响结果，除了包括所有物种的卡方距离模型。家庭分类学水平足以检测两个成分的相对贡献，但是对于该属水平，模型中包含的环境变量的数量更高。稀有物种的影响与应用于分析的指标有关。如果不希望对稀有物种权重，那么使用少数占优势的物种以及Hellinger函数可以为变异分区分析中的整个采样社区提供良好的替代。建议将属水平作为一种适当的分类学水平，用以评估多皮动物群落研究中空间和环境成分的相关性。

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