Community-wide scan identifies fish species associated with coral reef services across the Indo-Pacific - Supporting data

R script to define species that are potential key contributor to a given ecosystem service.Step 1: The goal is to model a given ecosystem service (Y) according to Environmental (E) and Socio-Economic conditions (SE) and species richness (R); to check its relevance according to its explanatory power and to save its Akaike Information Criterion (AIC_M0) as a reference for the next.Step2: The goal is to identify species key for the studied ecosystem service (Y) adding each candidate species (presence-absence) as an additional explanatory variable to M0 to compute model M1 and its associated AIC (AIC_M1). Finally, a species is declared as a key potential contributor to the ecosystem service if ΔAIC (AIC_M0-AIC_M1) &gt; 4 and if its partial effect is positive (positive coefficient in the model).Here we apply this framework to define the "key fish species" for fish biomass and live coral cover.Code by Eva Maire ([e-mail]). Last update on 2018-06-26. This code provides results of analysis used in Maire, E., Villéger, S., Graham, N., Hoey, A., Cinner, J.,Ferse, S., Aliaume, C, Booth, D., Feary, D., Kulbicki, M., Sandin, S., Vigliola, L. &amp; Mouillot, D. (2018). Community-wide scan identifies fish species associated to coral reef services globally. <i>Proceedings B</i>.

本脚本用于定义对特定生态系统服务具有潜在关键贡献的物种。
步骤1：基于环境因子（E）、社会经济条件（SE）与物种丰富度（R），对给定的生态系统服务（Y）构建统计模型；依据模型的解释能力验证其合理性，并保存该模型的赤池信息准则（Akaike Information Criterion，AIC_M0）作为后续参照。
步骤2：识别对所研究生态系统服务（Y）具有关键作用的物种：将每个候选物种的存在-缺失数据作为额外解释变量添加至基准模型M0，构建模型M1并计算其对应的赤池信息准则（AIC_M1）。最终，若ΔAIC（即AIC_M0 - AIC_M1）＞4，且该物种在模型中的偏效应为正（模型系数为正值），则将其认定为该生态系统服务的潜在关键贡献物种。
本研究将该分析框架应用于识别与鱼类生物量和活珊瑚盖度相关的"关键鱼类物种"。
本代码由Eva Maire编写（邮箱：[e-mail]），最后更新于2018年6月26日。
本代码生成的分析结果出自以下研究：Maire, E., Villéger, S., Graham, N., Hoey, A., Cinner, J., Ferse, S., Aliaume, C, Booth, D., Feary, D., Kulbicki, M., Sandin, S., Vigliola, L. & Mouillot, D. (2018). Community-wide scan identifies fish species associated to coral reef services globally. <i>Proceedings B</i>.