Morphometric data of Onithochiton neglectus populations from across New Zealand

Chain code, normalized Elliptic Fourier descriptors, PCA scores, and measurements of valve area (size) for the fourth, head, and tail valves (all samples used in the geometric morphometrics analyses of the paper ‘Hitchhiking consequences for genetic and morphological patterns: the influence of kelp rafting on a brooding chiton’)DESCRIPTION OF FILES (uploaded separately for each of the valves):- chaincode.txt = chain code used by software SHAPE (Iwata & Ukai, 2002) to record the outline of the structure;- chc2nef_out.nef.txt = normalized Elliptic Fourier Descriptors;- pca_scores = the PCA scores after Principal Component Analysis, considered quantitative traits;- size_measures = valve area measurements (approximation for size)

本数据集涵盖论文《搭便车效应对遗传与形态模式的影响：海藻漂流对育幼石鳖的作用》几何形态测量学分析所用全部样本的相关数据，包括第四瓣、头瓣与尾瓣的链码（Chain code）、归一化椭圆傅里叶描述子（normalized Elliptic Fourier Descriptors）、主成分分析得分，以及瓣壳面积（体型大小）的测量值。
文件说明（按每个瓣壳分别上传）：
- chaincode.txt：即软件SHAPE（Iwata与Ukai，2002）用于记录该结构轮廓的链码；
- chc2nef_out.nef.txt：即归一化椭圆傅里叶描述子；
- pca_scores：即主成分分析后的主成分得分，被视为定量性状；
- size_measures：即瓣壳面积测量值（作为体型大小的近似指标）