Table 1. Component matrix between principal components and original variables

Loading plots	Principal components
	PC1	PC2
Altitude	0.25	0.36
Water temp.	–0.15	0.60
Water pH	0.38	–0.60
Water TDS	0.64	–0.01
Water salinity	0.60	0.39
Eigen value	1.72	0.74
% of variance	36.73	28.74
Cumulative % of variance	36.73	65.47