Table 3.

Principal component analysis (PCA) correlations and loadings for all rivers and all habitat attributes with variables arranged in order of strength of association (Pearson correlation and loading) with axis 1 and variance (%) and cumulative variance (%) for axis 1 and axis 2. Four different ordinations are listed with their associated variables and loadings: Morph, Bed, Cover, and Comp-Dist. Pearson correlation coefficients in bold are >0.70 and are considered strong correlations.

Variable	Axis 1		Axis 2
	r	loading	r	loading
PCA-Morph: Channel morphology & size
xdepth	−0.87	0.76	0.34	0.11
sddepth	−0.75	0.56	0.12	0.01
xwidth	−0.46	0.21	−0.67	0.45
xwxd	−0.93	0.87	0.08	0.01
rp100	−0.65	0.42	0.36	0.13
xbkf_w	−0.33	0.11	−0.82	0.67
xbkf_dc	−0.25	0.06	−0.52	0.27
xbfwd_ratc	0.03	0.00	0.01	0.00
xslope	0.52	0.27	−0.03	0.00
xinc_h	0.05	0.00	−0.09	0.01
Variance explained (%)	33		17
Cumulative variance explained (%)	33		50
PCA-Bed: Stream stability & substrate size
lsub_dmm	−0.95	−0.46	0.18	0.15
pct_safn	0.87	0.42	−0.20	−0.17
LitSB1_SF	0.80	0.39	−0.23	−0.19
ldcbf_g08	−0.79	−0.38	−0.21	−0.18
cp3_mill	−0.78	−0.37	−0.10	−0.09
cp3ctrpwd	−0.62	−0.30	−0.58	−0.49
lrbs_g08	−0.58	−0.28	0.52	0.44
ct_rpwd	0.28	0.14	0.80	0.67
Variance explained (%)	54		18
Cumulative variance explained (%)	54		72
PCA-Cover: Instream & riparian cover
xfc_nat	0.91	0.45	0.31	0.22
xfc_big	0.78	0.39	0.52	0.36
xfc_lwd	0.74	0.37	−0.23	−0.16
xc	0.62	0.31	−0.34	−0.24
xcmgw	0.60	0.30	−0.26	−0.18
xfc_all	0.59	0.29	0.34	0.24
xfc_brs	0.57	0.28	− 0.30	− 0.21
xfc_rck	0.54	0.27	0.67	0.47
c1tm100	0.44	0.22	−0.65	−0.46
v1tm100	0.42	0.21	−0.59	−0.41
Variance explained (%)	41		20
Cumulative variance explained (%)	41		61
PCA-Comp-Dist: Habitat complexity and riparian human disturbance
w1_hall	0.98	0.65	0.11	0.12
w1_hnoag	0.88	0.58	−0.15	−0.15
w1_hag	0.60	0.40	0.57	0.59
pct_side	−0.42	−0.28	0.77	0.78
Variance explained (%)	57		24
Cumulative variance explained (%)	57		81