Abstract
Monitoring small mustelids like weasels Mustela nivalis and stoats M. erminea is challenging as they are rarely seen, leave scant field signs and display avoidance behaviour towards traps and monitoring devices. The Irish stoat M. erminea hibernica is a subspecies endemic to Ireland and the Isle of Man, and despite being widespread in Ireland, no information exists on its population status due to the difficulty of detection. We compared the efficacy of two camera trap methods to detect Irish stoats in counties Mayo and Galway, Republic of Ireland. Firstly, the ‘Mostela’ (a modified camera trapping device comprising a camera trap and a tracking tunnel inside a wooden box) and secondly, an external camera trap deployed outside the box. We used a single-season occupancy model to estimate the probability of detection and occupancy of Irish stoat using these two methods at 12 sites. Both methods detected stoats, at 17% of sites inside the Mostela and 33% of sites on the external camera, although this non-agreement was not statistically significant. Detection probabilities were low, with wide and largely overlapping confidence intervals for both methods. Occupancy probabilities were relatively low, and the occupancy probability for the external camera was very close to the naïve occupancy estimate. We evaluate the potential applicability of both methods for future work to assess the population and conservation status of this little-studied species.
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The datasets generated during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We wish to thank National Parks and Wildlife Service Conservation Ranger John Higgins for his assistance in site selection and for introducing us to landowners. We are grateful to all the landowners for allowing us to access their land. The fieldwork for this study was undertaken as part of a Master’s degree at Queen’s University Belfast. We thank Patrick Wright and three reviewers, whose comments greatly improved the manuscript.
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EC, SPC, RH, KM and JM contributed to the study conception and design. Material preparation was carried out by EC, RH, BH and KM. Data collection was performed by RH and BH. Data analysis was performed by EC and JM. The first draft of the manuscript was written by EC, and all authors commented on the manuscript and approved the final version.
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Communicated by Karol Zub.
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Croose, E., Hanniffy, R., Hughes, B. et al. Assessing the detectability of the Irish stoat Mustela erminea hibernica using two camera trap-based survey methods. Mamm Res 67, 1–8 (2022). https://doi.org/10.1007/s13364-021-00598-z
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DOI: https://doi.org/10.1007/s13364-021-00598-z