Result of multiple regression of a response variable (body size or density) against explanatory environmental variables (depth, silt, sand, and gravel).

Results were computed for the complete dataset, and for different sub-datasets, considering different combinations of age (adult and juvenile) and sampling period (April and June). Significant explanatory variables were selected using a forward selection procedure and tested by permutations.本研究针对完整数据集与不同子数据集完成了相关计算，其中子数据集基于年龄（成年与幼年）和采样时段（4月与6月）的不同组合进行划分。显著解释变量采用向前选择法（forward selection procedure）进行筛选，并通过置换检验完成显著性验证。