Exploring the macroevolutionary signature of asymmetric inheritance at speciation

Popular comparative phylogenetic models such as Brownian Motion, Ornstein-Ulhenbeck, and their extensions, assume that, at speciation, a trait value is inherited identically by two descendant species. This assumption contrasts with models of speciation at a micro-evolutionary scale where descendants’ phenotypic distributions are sub-samples of the ancestral distribution. Different speciation mechanisms can lead to a displacement of the ancestral phenotypic mean among descendants and an asymmetric inheritance of the ancestral phenotypic variance. In contrast, even macro-evolutionary models that account for intraspecific variance assume symmetrically conserved inheritance of ancestral phenotypic distribution at speciation. Here we develop an Asymmetric Brownian Motion model (ABM) that relaxes the assumption of symmetric and conserved inheritance of the ancestral distribution at the time of speciation. The ABM jointly models the evolution of both intra- and inter-specific phenotypic variat..., , , # Exploring the macroevolutionary signature of asymmetric inheritance at speciation --- This dataset contains what is needed to reproduce the application of the ABM model on the Coerebinae dataset. ## Description of the Data and file structure Data/Coerebinae.csv: Trait dataset in a .csv format. This file contains individual measurements of 4 beak traits as well as information about the measured individual (Species name, specimen ring number, sex, and whether the individual was a juvenile or not). Bill total culmen (cm) refers to the length of the upper part of the beak from the tip to the skull. Bill nares (cm) refers to the length of the upper part of the beak from the tip to the nares. Bill width (cm) refers to the width of the upper part of the beak at the nares. Bill depth (cm) refers to the height of the beak at the nares. Missing data is marked as NA. Data/Coerebinae.tre. Phylogenetic tree file in Newick format with branch lengths representing divergence time in my. Scripts...主流的比较系统发育模型（comparative phylogenetic models），如布朗运动（Brownian Motion）、奥恩斯坦-乌伦贝克（Ornstein-Ulhenbeck）模型及其扩展形式，均假设在物种形成事件中，祖先的性状值会被两个后裔物种完全一致地继承。这一假设与微进化尺度下的物种形成模型相悖——后者中后裔的表型分布实为祖先表型分布的子样本。不同的物种形成机制可导致后裔的祖先表型均值发生偏移，并引发祖先表型方差的不对称遗传。与之相对，即便考虑了种内方差的宏观进化模型，仍假设物种形成时祖先表型分布的遗传是对称且保守的。本文提出一种非对称布朗运动模型（Asymmetric Brownian Motion, ABM），该模型放宽了物种形成时祖先表型分布对称且保守的遗传假设。ABM联合建模了种内与种间的表型变异…… # 探究物种形成过程中不对称遗传的宏观进化特征 --- 本数据集包含可复现ABM模型在Coerebinae数据集上应用的全部所需材料。 ## 数据与文件结构说明 `Data/Coerebinae.csv`：逗号分隔值（CSV）格式的性状数据集。该文件收录了4种喙部性状的个体测量数据，以及被测个体的相关信息（物种名称、标本环号、性别及个体是否为幼体）。其中：喙总嘴峰长（cm）指从喙尖至颅骨的上颌喙部长度；喙鼻孔距（cm）指从喙尖至鼻孔的上颌喙部长度；喙宽（cm）指鼻孔位置处的上颌喙部宽度；喙深（cm）指鼻孔位置处的喙部高度。缺失数据以NA标记。 `Data/Coerebinae.tre`：Newick格式的系统发育树文件，其分支长度代表以百万年（my）为单位的物种分化时间。 Scripts...