Melomys population monitoring
To determine whether the arrival of a novel predator resulted in demographic impacts (population size and survival) to a native prey species, we monitored four “impact”, quoll-invaded sites established in the north of Indian island in the vicinity of where quolls were released and three “control”, quoll-free sites established in the south of the island (Fig. 1). Populations of melomys on Indian Island were monitored during four trips occurring immediately prior to the introduction of quolls in May (site 1) 2017, and after the introduction of quolls August 2017 (sites 2–7), April 2018 (sites 1–7), and May 2019 (sites 1–7).