Figure 2.

Mean relative fitness of mutation accumulation line genotypes derived from two ancestral strains under decreasing phosphate 400% (0.6 g L⁻¹), 200% (0.3 g L⁻¹), 100% (0.15 g L⁻¹), 50% (0.075 g L⁻¹), 25% (0.038 g L⁻¹), 10% (0.015 g L⁻¹), and 5% (0.0075 g L⁻¹) KH ₂ PO ₄; and increasing NaCl (0–6 g L⁻¹ of NaCl in 1 g L⁻¹ increments) conditions, ordered by increase in stress level. Error bars indicate 95% confidence intervals.