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. 2023 Mar 15;290(1995):20222113. doi: 10.1098/rspb.2022.2113

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© 2023 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 4. — Density estimates of possums in open grassland (approx. 1000 ha) habitats on Maria Island from 2010 to 2018 scaled against population size of devils. Increasing devil density is related to years since their introduction, starting with the introduction of 15 devils in November 2012. Possum population estimates are derived from spotlight survey counts using distance sampling methods for the western part of the island only. The absence of s.e. bars on density estimates reflects none or low counts for those years which could not be estimated using DISTANCE software. Devil populations were derived from regular monitoring by the Save the Tasmanian Devil Program (DPIPWE 2019, unpublished data).