Figure 4.

Iron oxide accretion measured on glass slides incubated as a function of time in One Hundred Spring Plain (OSP) (A) and Beowulf (B) Springs outflow channels in Norris Geyser Basin, Yellowstone National Park. The dashed black line represents a model fit to the exponential rate expression Fe_x = Fe_oe^kt, where Fe_x is iron oxide accreted (μmol Fe cm⁻²), Fe_o is the initial iron oxide concentration (μmol Fe cm⁻²), k is the first-order rate constant (day⁻¹), and t is time (day). Total DNA concentrations determined from slides incubated in One Hundred Spring Plain (OSP) (C) and Beowulf Spring (D) over a time period of 70 days. The solid black line represents a model fit to the exponential rate expression DNA_x = DNA_oe^rt, where DNA_x is DNA accumulated (ng DNA cm⁻²), DNA_o is the initial DNA concentration (ng DNA cm⁻²), r is the first-order rate constant (day⁻¹), and t is time (day).