Table 2.

Mercury methylation capabilities of several Desulfovibrio species

Species or strainSourceMediumMeHg produced (ng/ml)a
Avg (SD)Abiotic control
D. desulfuricans aestuariiSylt3ATCC 29578Sulfate-lactate0.040 (0.02)0.020
D. desulfuricans subsp. desulfuricans Essex 6DSM 642Sulfate-lactate0.001 (0.000)0.001
D. desulfuricans subsp. desulfuricans El Agheila ZDSM 1926Sulfate-lactate0.001 (0.001)0.001
D. desulfuricans G20J. WallSulfate-lactate0.001 (0.001)0.001
D. gigasDSM 1382Sulfate-lactate0.000 (0.001)0.020
D. salexigensDSM 2638Sulfate-lactate0.24 (0.32)0.08
D. africanusDSM 2603Sulfate-lactate0.51 (0.052)0.02
D. africanusDSM 2603Pyruvate-fumarate3.4 (0.79)0.003
D. vulgaris HildenboroughDSM 644Sulfate-lactate0.03 (0.02)0.01
Desulfovibrio sp. strain T2Chesapeake sedimentsSulfate-lactate1.5 (0.3)0.02
Desulfovibrio sp. strain X2Chesapeake sedimentsSulfate-lactate0.35 (0.1)0.10
D. desulfuricans ND132Chesapeake sedimentsSulfate-lactate0.70 (0.26)0.16
D. desulfuricans ND132Chesapeake sedimentsPyruvate-fumarate3.3 (0.30)0.05
  • a Methylation was assayed by measuring MeHg at the end of batch growth, i.e., once cultures reached stationary phase, on medium containing 10 ng Hg/ml, added as HgCl2 prior to inoculation. All assays were performed in triplicate, and averages are presented with standard deviations (SD).