Table 3.

Comparison of water column-to-sediment ARG ratios and ARG flux in the dry-season and wet-season for sampling near and away from major waste outfalls into the river.

	Dry-season		Wet-season
	Near outfallsa	Away from outfalls	Near outfalls	Away from outfalls
Water column-to-sediment ARG ratiob	0.017 (0.011)	0.0008 (0.0004)	0.025 (0.015)	0.011 (0.006)
Gene migration downstream (log gene abundance/s)c	8.37 (0.39)	7.08 (0.33)	9.49 (0.34)	8.73 (0.37)

^aSampling stations near outfalls include 3A, 4, 5A, and 8, whereas stations away from outfalls include 5, 6, 7, and 9.

^bRatio of water column ARG abundances to sediment ARG abundances at the same sampling station (based on triplicates per station). Ratios were calculated for nine different ARG.

^cGene migration rates calculated based on flow rate measurements for the most downstream stations with and without a proximally close outfall, stations 3A and 5, respectively. Mean values based on flux estimates for the same nine ARG detected at both stations; 95% confidence intervals of estimates in brackets.