Occurrences of 2-methylisoborneol and geosmin –degrading bacteria in a eutrophic reservoir and the role of cell-bound versus dissolved fractions

As taste-and-odor outbreaks are common in surface waters worldwide, extensive studies have focused on the identification of microorganisms involved production 2-methylisoborneol (MIB) and geosmin (GSM). However, fewer tried to identify potential degraders natural environments. Eagle Creek Reservoir, a temperate eutrophic water body, experienced two major seasonal odorous 2013 with maximal concentrations 99.1 77.3 ng L −1 Fractionation analyses compounds showed that MIB was found more frequently dissolved fraction while GSM mostly cell-bound. This difference likely impacts (T&O) compound susceptibility biodegradation by bacteria. Spearman relationships epilimnetic samples collected between spring early fall linked occurrences higher abundances Bacteroidetes like Flavobacterium resistens, F. granuli, saliperosum ( p < 0.001), kamogawaensis 0.01) capable degradation. Occurrences cell-bound were correlated α-Proteobacteria Novosphingobium hassiacum 0.001) Sphingomonas oligophenolica 0.01), both identified as GSM. The roles Pseudomonas Bacillus ambiguous, these genera might been biodegradations 0.05). • Seasonal events reservoir generate compounds. Bacteriodetes dominant degraders. Geosmin is prevalently whereas dissolved. biodegradation; degrade MIB.