Table 1. Final redundancy analysis of the structure of the microbial communities in relation to environmental factors.

Effect	df	Variance	Pseudo-F	P-value
Distance from the terminus	1	0.001	1.809	0.047
Glacier	1	0.003	8.289	0.005
Month	1	0.001	1.916	0.035
Organic C	1	0.001	2.373	0.015
Ablation rate	1	0.001	2.247	0.010
Residual	32	0.011

Abbreviations: d.f., degrees of freedom.

Overall model significance: pseudo-F_5,32=4.137, P=0.005.

Significance was assessed by a randomization procedure (Legendre and Legendre, 1998).