Figure 3. Posterior mean population sizes (Nks ± 95% CI) for quoll-invaded and quoll-free populations of grassland melomys (Melomys burtoni ) on Indian Island, Northern Territory, Australia. The orange dotted vertical line denotes the timing of the introduction of quolls. The red dotted vertical line denotes the timing of an unplanned fire that burnt through the quoll-invaded sites. In each predator treatment, different sites are denoted by different shaped points. Estimates assume closure of the population within each session and detection probability that varies across sessions.