Observations of the conchological structure of Santos Beach (Brazil) during the summer of 2020

Raw datasets of the conchological structure composed of fragmented and whole empty shells, observed during the summer of 2020 in Santos Beach (Brazil), according to sector (damp or wet), tide (neap or spring), transect (sampling structure), zone (depostion or erosion) and field trip (date of collection event). DATASET 1: totais.txt - abundances in weight and in number within each sampling unit (rows), regardless of species. DATASET 2: comm.txt - abundances in number within each sampling (rows), where each column is a different species. Not all observations are independent, since one should take into account the nesting of the sampling design: transect within zone within fieldtrip (variable 'saida' in the data files).

本数据集为2020年夏季于巴西桑托斯海滩（Santos Beach）采集的软体动物贝壳结构原始数据，样本涵盖破碎空贝壳与完整空贝壳。采样按以下维度及划分标准分组：扇区（sector）按湿润/浸湿状态划分、潮汐（tide）按小潮/大潮划分、样带（transect）为采样结构、潮间带区域（zone）按沉积型/侵蚀型划分、野外采集行程（field trip）按采集事件日期划分。
数据集1：totais.txt，记录各采样单元（行）内的总丰度，包含重量与个体数量两种统计维度，未区分物种。
数据集2：comm.txt，记录各采样单元（行）内的物种丰度（以个体数量计），每一列对应一个不同物种。需注意部分观测样本并非独立样本，需考虑采样设计的嵌套结构：野外采集行程内嵌套区域，区域内嵌套样带（数据文件中变量名为'saida'）。