Fig 3.
Most-probable-number (MPN) counts of Fe(III)-reducing (FeRed) and anaerobic Fe(II)-oxidizing (anFeOx) microorganisms from the top 10 cm of Lake Kasin in mineral medium with 5 M (black bars) and 0.5 M NaCl (white bars), respectively. Medium for FeRed was supplemented with 0.5 M ferrihydrite as electron acceptor and 0.5 M lactate and acetate each as electron donors. For anFeOx, 10 mM FeCl2 was added as the electron donor and 0.4 M NO3− as the electron acceptor. The Fe(II) oxidizer medium further contained 0.05 M acetate as a carbon source. Error bars denote 95% confidence intervals determined from seven replicate samples according to the work of Klee (34).