Salamander metamorph body size data

Columns indicate: Date = the date of metamorphosis, Day = the day of the experiment, Tank = the experimental tank, Block = the experimental block, Treatment = the experimental treatment, Density = the categorical overall density, Mole = the number of mole salamanders (Ambystoma talpoideum), Spotted = the number of spotted salamanders (Ambystoma maculatum), Species = the species of salamander (talp = Ambystoma talpoideum; mac = Ambystoma maculatum), SVL = metamorph snout-vent length (in cm), and Mass = metamorph mass (in grams).本数据集各列含义如下：Date为变态发生日期，Day为实验日数，Tank为实验养殖缸，Block为实验区块，Treatment为实验处理组，Density为分类总密度变量，Mole为鼹钝口螈（Ambystoma talpoideum）的个体数量，Spotted为斑点钝口螈（Ambystoma maculatum）的个体数量，Species为蝾螈物种（talp对应鼹钝口螈，mac对应斑点钝口螈），SVL为变态个体的吻肛长（snout-vent length，单位：厘米），Mass为变态个体的体重（单位：克）。