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Competition of isogenic strains in mallards. Linear regression of the ratios of GyrAD87Y/GyrAwt (A) and GyrAS83L/GyrAwt (C) strains at different concentrations of ciprofloxacin. Plots of the selection coefficient per day at each specific antibiotic concentration for GyrAD87Y/GyrAwt (B) and GyrAS83L/GyrAwt (D) with inserted trend lines and standard errors of the slopes (calculated from the linear slopes in panels A and C). All concentrations are in micrograms per liter.
