Table 2.

Summarized results of pRDA data for both focal species

Model	Inertia	R 2	P(>F)	Proportion of explainable variance	Proportion of total variance
B. vancouverensis
Full model	10,591,543	0.0205	0.001	1	0.207
Environment	6,575,573	0.0129	0.001	0.621	0.128
Geography	2,728,061	0.00727	0.001	0.258	0.053
Structure	1,188,863	0.000443	0.424	0.112	0.023
Confounded	99,046	…	…	0.009	0.002
Total unexplained	40,675,527	…	…	…	0.793
Total inertia	51,267,070	…	…	…	1
B. vosnesenskii
Full model	13,356,586	0.0167	0.001	1	0.172
Environment	7,739,843	0.0114	0.001	0.579	0.01
Geography	3,810,203	0.00521	0.005	0.285	0.049
Structure	1,664,682	−0.000315	0.614	0.125	0.021
Confounded	141,858	…	…	0.011	0.002
Total unexplained	64,388,098	…	…	…	0.828
Total inertia	77,744,684	…	…	…	1

Inertia is synonymous with variance. Model significance is reported in the P(>F) column with significant models (P < 0.05) being denoted by bold text. Proportion of explainable variance is the ratio between the inertia of a given model and the full model. The proportion of total variance is the ratio between inertia accounted for in a given model and the total inertia in the dataset.