Amphipod responses to conspecific and heterospecific opponents A shelter occupancy time and B number of aggression acts shown by D. haemobaphes (circles) and D. villosus (squares) (pooled infection status) in response to non-infected conspecifics and heterospecifics. Results are back-transformed least squares means (±95% confidence intervals) predicted for significant effects by the General or Generalized Linear Models (analyses E-F in Table 1 and Suppl. material 1, Table S2). Treatments marked with the same lowercase letters did not differ significantly from one another. Non-significant effects are pooled.