Table 3.

Descriptive statistics of local habitat structure variables and their correlation with the first three principal components of the local habitat variables PCA

	Unit	Mean	SD	Min	Max	PC1 (42.05%)	PC2 (12.70%)	PC3 (12.31%)
Area	ha	62.63	115.47	0.30	464.37	0.79	0.44	− 0.25
Depth	m	1.31	1.25	0.40	6.00	0.87	0.39	− 0.15
Emergent plants	%	9.25	15.64	0.00	75.00	− 0.54	− 0.08	− 0.13
Submerged plants	%	6.48	12.33	0.00	57.50	− 0.5	0.46	− 0.31
Floating plants	%	16.56	23.09	0.00	80.00	− 0.59	0.47	− 0.03
Surface algae	%	0.29	1.44	0.00	7.50	− 0.28	0.34	− 0.47
Open water	%	64.38	33.73	3.00	100.00	0.79	− 0.43	0.21
Woody debris	%	3.04	6.70	0.00	35.00	− 0.56	0.15	− 0.14
Woody/trees	%	66.54	28.95	0.00	100.00	0.16	0.54	0.78
Herbaceous	%	31.88	29.13	0.00	100.00	− 0.24	− 0.53	− 0.76
Artificial	%	1.58	3.02	0.00	10.00	0.77	− 0.07	− 0.18
Canopy cover	%	21.71	25.84	0.00	82.50	− 0.63	0.19	− 0.33
Rock	%	3.38	11.78	0.00	48.00	0.77	0.43	− 0.35
Sand	%	7.35	12.12	0.00	50.00	0.76	− 0.31	0.03
Silt	%	89.27	18.80	35.00	100.00	− 0.92	0.05	0.12
Velocity	cm/s	6.12	14.83	0.00	60.00	0.86	0.3	− 0.29
Connectivity	%	41.4	34.9	0	100	0.22	− 0.25	− 0.23

The explained variance of each principal component is shown in parentheses