Forest plot based on the Cox proportional hazards regression model, with species and salinity as covariates. Hazard ratios, the ratios of the mortality rates under our experimental salinities, are shown by black squares with 95% confidence intervals by solid horizontal lines (note also stated numerically in “Hazard ratio” column). Hazard ratios, HRs, greater than one (i.e. to the right of the dashed line) indicate that the covariate is associated with increased risks of mortality, with those less than one (i.e. to the left of the dashed line) associated with decreased risks of mortality. We see significant effects of species and salinity on survival, and using the freshwater Anentome helena as our reference, we see that M. tuberculata and Tarebia granifera have reduced risks of mortality relative to the reference species, with HRs of 0.0047, and 00073, or 99.53% and 99.27% less, respectively. The concordance index of 0.94 suggested good predicative accuracy of the model on survival outcomes. Survival is based on results at 30 days under experimental salinity conditions.