Supplement 1. Maple file for constructing conditional probability tables from signed directed graphs, SDG graphical editor program, example BBNs for the parasitoid and lake mesocosm studies, and instruction guide for SDG-BBN construction.

File List Guide.pdf -- Instruction guide for SDG-BBN construction CPT Builder.mws -- Maple file that constructs conditional probability tables SDG Graphical Editor -- InstallAnywhere Self Extractor application that allows user to draw SDG and construct the transposed signed adjacency matrix °A parasitoid.neta -- Bayes net for parasitoid example lake.neta -- Bayes net for mesocosms example Description This instruction guide Guide.pdf describes in detail the transition from a signed directed graph (SDG) to a Bayesian Belief Network (BBN). The instruction guide begins by deriving the qualitative mathematics for the host-parasitoid example. Instructions are given for drawing an SDG and the associated matrix ºA using the SDG Graphical Editor. The guide shows how to construct the conditional probabilities using the Maple file CPT Builder.mws. Example Bayes nets are included for the parasitoid example (parasitoid.neta) and the lake mesocosms example (lake.neta). These latter two files use the BBN software Netica, available at www.norsys.com.文件列表说明： 1. File List Guide.pdf：SDG-BBN构建说明指南（其中SDG为Signed Directed Graph，有向符号图；BBN为Bayesian Belief Network，贝叶斯置信网络） 2. CPT Builder.mws：用于构建条件概率表的Maple文件 3. SDG Graphical Editor：一款InstallAnywhere自解压应用程序，支持用户绘制有向符号图（SDG）并构建转置符号邻接矩阵 4. parasitoid.neta：适用于寄生蜂示例的贝叶斯网络文件 5. lake.neta：适用于湖中生态舱实验示例的贝叶斯网络文件 描述：本说明指南（Guide.pdf）详细阐述了从有向符号图（Signed Directed Graph，SDG）到贝叶斯置信网络（Bayesian Belief Network，BBN）的转换流程。指南首先推导了寄主-寄生蜂示例的定性数学模型，随后讲解了如何使用SDG图形编辑器绘制SDG并生成关联矩阵°A，同时演示了通过Maple文件CPT Builder.mws构建条件概率表的具体步骤。指南附带了寄生蜂示例（parasitoid.neta）与湖生态舱实验示例（lake.neta）的示例贝叶斯网络文件，这两个文件均使用可从www.norsys.com获取的BBN软件Netica运行。