The ordination diagram of the principal component analysis (PCA) of sampling location (SL) and water level (WL) along with the 13 measured functional traits. The definitions of the abbreviations and descriptions are shown in Table 2. Dashed blue vectors with transparent arrows represent the 13 measured functional traits (response variables), and the solid red vectors with filled arrows represent the two explanatory variables, SL and WL. Arrows indicate the increase in values from the ordination center. The angle between the functional traits and factors represents their correlations, and the sharper the angle, the stronger the correlation.