Culturable Rhodobacter and Shewanella species are abundant in estuarine turbidity maxima of the Columbia River.

ABSTRACT: Measurements of dissolved, ascorbate-reducible and total Mn by ICP-OES revealed significantly higher concentrations during estuarine turbidity maxima (ETM) events, compared with non-events in the Columbia River. Most probable number (MPN) counts of Mn-oxidizing or Mn-reducing heterotrophs were not statistically different from that of other heterotrophs (10³ -10⁴ cells ml⁻¹) when grown in defined media, but counts of Mn oxidizers were significantly lower in nutrient-rich medium (13 cells ml⁻¹). MPN counts of Mn oxidizers were also significantly lower on Mn(III)-pyrophosphate and glycerol (21 cells ml⁻¹). Large numbers of Rhodobacter spp. were cultured from dilutions of 10⁻² to 10⁻⁵, and many of these were capable of Mn(III) oxidation. Up to c. 30% of the colonies tested LBB positive, and al

SUBMITTER: Brauer SL 

PROVIDER: S-EPMC5675538 | biostudies-literature | 2011 Mar

REPOSITORIES: biostudies-literature