Are weapon allometries steeper in major or minor males? A meta-analysis

Competition for mates can drive the evolution of exaggerated weaponry and male dimorphism associated with alternative reproductive tactics. In terrestrial arthropods, male dimorphism is often detected as non-linear allometries, where the scaling relationship between weapon size and body size differs in intercept and/or slope between morphs. Understanding the patterns of non-linear allometries is important as it can provide insights into threshold evolution and the strength of selection experienced by each morph. Numerous studies in male-dimorphic arthropods have reported that allometric slopes of weapons are shallower in large “major” males compared to small “minor” males. Because this pattern is common among beetles that undergo complete metamorphosis (holometabolous), researchers have hypothesized that the slope change reflects resource depletion during pupal development. However, no comprehensive survey has examined the generality of this trend. We systematically searched the literat..., , , # Are weapon allometries steeper in major or minor males? A meta-analysis The dataset contains two Excel files and 2 R files. ## Data Contents: meta_data.csv is the complete dataset used in the meta-regression analyses meta_code.R includes all R code used for the meta-regression analyses and production of figures Compiling_data.xlsx reports the raw data extracted from each study used to calculate effect sizes (Hedges' g) Calculating Hedges g.R reports the R code used for calculating effect sizes based on the compiled data ## Key to datasets: ### The meta\_data.csv file has the following columns: **Citation:** Author and year of the study included in the meta-analysis **Metamorphosis:** Categorial variable indicating the type of metamorphosis of the study organism (holometabolous = complete metamorphosis; hemimetabolous = incomplete or no metamorphosis) **Order:** Taxonomic rank of the study organism **Family:** Taxonomic rank of the study organism **rotl_spp:** Species nam...择偶竞争可推动与另类生殖策略相关的夸张型武器装备及雄性二态性的演化。在陆生节肢动物中，雄性二态性通常表现为非线性异速生长（allometry）关系，即不同形态个体的武器大小与体型大小的缩放关系在截距和/或斜率上存在差异。明晰非线性异速生长的模式具有重要意义，因其可揭示阈值演化及各形态个体所经历的选择强度。诸多针对雄性二态性节肢动物的研究均表明，相较于小型「次型（minor）」雄性，大型「主型（major）」雄性的武器异速生长斜率更平缓。由于该模式在经历完全变态（holometabolous）的甲虫中颇为常见，研究者据此提出假说，认为斜率变化反映了蛹期发育过程中的资源耗竭现象。然而目前尚无全面的综述研究检验该趋势的普遍性。我们系统检索了相关文献……# 大型雄性的武器异速生长斜率更陡峭还是更平缓？一项元分析 本数据集包含2个Excel文件与2个R脚本文件。 ## 数据内容： meta_data.csv：用于元回归（meta-regression）分析的完整数据集 meta_code.R：用于元回归分析与图表生成的全部R代码 Compiling_data.xlsx：为计算效应量（Hedges' g）而从各项研究中提取的原始数据 Calculating Hedges g.R：用于基于整理后的数据计算效应量的R代码 ## 数据集字段说明： ### meta_data.csv 文件包含以下列： **引文（Citation）**：纳入元分析的研究作者及发表年份 **变态类型（Metamorphosis）**：分类变量，指示研究生物的变态类型（holometabolous = 完全变态；hemimetabolous = 不完全变态或无变态） **目（Order）**：研究生物的分类阶元——目 **科（Family）**：研究生物的分类阶元——科 rotl_spp：物种名称……