Supplement 1. R scripts used in morphological null model and guild proportionality analysis.

File List MNND_Analysis_supplement_Code.R Guild_Proportionality_Analysis_supplement_Code.R Morphological_and_Guild_Analysis_supplement_Code.R Description These code illustrates in detail the R scripts used in morphological null model and guild proportionality analysis. For the morphological null model analysis, the code provided here uses the R function <i>sample</i> in the R-package base to build a null distribution of species traits and tests if the morphological structure of the assemblage is more variable (significant divergence) or more uniform (significant aggregation) than expected from assemblages that are comprised of random samples drawn from a pool of potential colonizers. For the guild proportionality analysis, the code provided here uses random matrices of species co-occurrences generate by EcoSim software (Gotelli and Entsminger 2005) to calculate the observed Variance Relative Index (Watkins and Wilson 2003). This index has a range of +1 to -1; assuming value equal to 0 when the observed variance in guild proportion is equal to that expected under the null model, and value smaller than 0 when there is guild proportionality (Alpha guilds). A value &gt; 0 indicates disproportionality (Beta guilds structuring). MNND_Analysis_supplement_Code.R contains annotated code for morphological null model analysis.<br> Guild_Proportionality_Analysis_supplement_Code.R contains annotated code for guild proportionality analysis.<br> Morphological_and_Guild_Analysis_supplement_Code.R contains annotated code used in morphological null models analysis and guild proportionality analysis.

文件列表
MNND_Analysis_supplement_Code.R
Guild_Proportionality_Analysis_supplement_Code.R
Morphological_and_Guild_Analysis_supplement_Code.R

描述
本部分详细阐释了形态零模型（morphological null model）与类群比例分析（guild proportionality analysis）中所使用的R脚本。
在形态零模型分析中，本代码利用R基础包（base package）中的`sample`函数构建物种性状的零分布，并检验群落的形态结构相较于从潜在定植者库中随机抽样形成的群落预期值，是否呈现更高的变异度（显著分化）或更高的均匀性（显著聚集）。
在类群比例分析中，本代码使用由EcoSim软件（Gotelli与Entsminger，2005）生成的物种种间共现随机矩阵，计算观测到的方差相对指数（Variance Relative Index，Watkins和Wilson，2003）。该指数的取值范围为+1至-1：当类群比例的观测方差与零模型下的预期方差相等时，指数值为0；当存在类群比例性（Alpha类群，Alpha guilds）时，指数值小于0。指数值大于0则表明存在比例失衡（Beta类群结构，Beta guilds structuring）。
`MNND_Analysis_supplement_Code.R`包含用于形态零模型分析的带注释代码；
`Guild_Proportionality_Analysis_supplement_Code.R`包含用于类群比例分析的带注释代码；
`Morphological_and_Guild_Analysis_supplement_Code.R`包含用于形态零模型分析与类群比例分析的带注释代码。