Environmental filtering both indirectly and directly drives the Dry Tropical Forest species composition and functional composition,Ecological Research

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Environmental filtering both indirectly and directly drives the Dry Tropical Forest species composition and functional composition
Ecological Research ( IF 1.7 ) Pub Date : 2020-10-02 , DOI: 10.1111/1440-1703.12178
Fernanda Moreira Gianasi ₁ , Cléber Rodrigo Souza ₂ , Nathalle Cristine Alencar Fagundes _{1,

3} , Vinícius Andrade Maia ₂ , Jean Daniel Morel ₂ , Paola Ferreira Santos ₁ , Rubens Manoel Santos _{1,

2}

Affiliation

Soil is a relevant driver of taxonomic, functional and phylogenetic composition at local scales. However, the mechanisms by which the soil act in these components or how these components interact with each other are not elucidated. Herein, we propose to understand the role of soil (environmental filtering) on the turnover of taxonomic and phylogenetic components and their role in determining the functional composition of Seasonally Dry Tropical Forest (SDTF) communities. We sampled all the arboreal individuals with Diameter at Breast Height equal to or higher than 3 cm and collected soil variables of 25 units from five SDTF fragments located in the Brazilian Caatinga Domain. These data enabled us to obtain the taxonomic, functional and phylogenetic composition of each plot, which were then analyzed by Structural Equation Models jointly with the soil variables. Our results suggest that the soil conditions select specific phylogenetic lineages from a regional species pool according to the adaptive potential, which affects the distribution and abundance of species (taxonomic composition). However, it was not possible to establish a direct relationship between the phylogenetic composition and the taxonomic composition, possibly due to the use of labile functional traits in the analysis. We also found that soil acts directly on the functional composition, leading to a differential success of individuals which would represent a direct and indirect effect of taxonomic composition on the functional composition. Thus, we found community aspects result from different ecological mechanisms which act in a continuous and progressive way between functional, phylogenetic and taxonomic composition.

中文翻译：

环境过滤间接或直接驱动热带热带森林物种组成和功能组成

在地方尺度上，土壤是分类，功能和系统发育组成的重要驱动力。但是，尚未阐明土壤在这些成分中起作用的机制或这些成分如何相互作用。在本文中，我们建议了解土壤（环境过滤）在生物分类和系统发育成分更新中的作用，以及它们在确定季节性干燥热带森林（SDTF）群落功能组成中的作用。我们采样了所有乳房高度等于或高于3 cm的乔木个体，并从巴西Caatinga域中的5个SDTF片段中收集了25个单位的土壤变量。这些数据使我们能够获得每个样区的分类，功能和系统发育组成，然后通过结构方程模型与土壤变量一起进行分析。我们的结果表明，土壤条件会根据适应性潜力从区域物种库中选择特定的系统发生谱系，这会影响物种的分布和丰度（生物分类组成）。但是，由于在分析中使用了不稳定的功能性状，因此不可能在系统发育组成和分类组成之间建立直接关系。我们还发现土壤直接作用于功能成分，导致个体的不同成功，这将代表生物分类成分对功能成分的直接和间接影响。从而，

更新日期：2020-10-02

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