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Percent sample containing either sheaths (open squares), stalks (filled circles), or disorganized particulate (triangles) iron-oxyhydroxides in LD during 2009 (a) and 2010 (b) and concentration of total cells (triangles; cells staining with Syto13), Gallionellales cells (filled circles; using FISH probe Gal221) and L. ochracea cells (open squares; using Lepto175 probe) (c). Error bars represent triplicate samples.
