The effect of infection on time spent together in shelter by two amphipods. Pairs were composed of infected or non-infected D. haemobaphes and/or D. villosus. Results are back-transformed least squares means (±95% confidence intervals) predicted by the General Linear Model (analysis H in Table 1 and Suppl. material 1: Table S2). Treatments marked with the same lowercase letters did not differ significantly from one another.