Table 1. Distance-decay regression coefficients based on the Bray-Curtis dissimilarity index (Y); Regression coefficient based on the Sørensen Similarity index; and the exponent z calculated by the distance-decay approach values for each one of the target genes calculated by -(regression coefficient)/2.

Gene	Distance-decay (Y)	Sørensen Regr. Coefficient	(z)
mcrA	0.14	−0.032	0.016
Archaea 16S rRNA	0.11	−0.031	0.0155
Bacteria 16S rRNA	0.067	−0.018	0.009