Figure 3.

Survivorship of Aiptasia pallida polyps infected with S. marcescens. Ten-fold dilutions of overnight cultures of S. marcescens PDL100 and CK2A4 were inoculated into microtiter plate wells with A. pallida. Infections were maintained at room temperature (22–24 °C) with illumination. Polyps were scored daily. Each line represents the proportion of polyps surviving at each concentration (10⁶ cfu ml⁻¹, 10⁷ cfu ml⁻¹, 10⁸ cfu ml⁻¹, or control as shown in the key). Survivorship decreased significantly with increasing pathogenic concentration for polyps infected with (a) S. marcescens PDL100 (χ²=38.604; dF=4; P<0.0001) and (b) S. marcescens CK2A4 (χ²=28.249; dF=3; P<0.0001).