Application of the Random Encounter Model in citizen science projects to monitor animal densities

Schaus, Jessica; Uzal, Antonio; Gentle, Louise K.; Baker, Philip J.; Bearman-Brown, Lucy; Bullion, Simone; Gazzard, Abigail; Lockwood, Hannah; North, Alexandra; Reader, Tom; Scott, Dawn M.; Sutherland, Christopher S.; Yarnell, Richard W.

Abstract

© 2020 The Authors. Remote Sensing in Ecology and Conservation published by John Wiley & Sons Ltd on behalf of Zoological Society of London. Abundance and density are vital metrics for assessing a species’ conservation status and for developing effective management strategies. Remote-sensing cameras are being used increasingly as part of citizen science projects to monitor wildlife, but current methodologies to monitor densities pose challenges when animals are not individually recognizable. We investigated the use of camera traps and the Random Encounter Model (REM) for estimating the density of West European hedgehogs (Erinaceus europaeus) within a citizen science framework. We evaluated the use of a simplified version of the REM in terms of the parameters’ estimation (averaged vs. survey-specific) and assessed its potential application as part of a large-scale, long-term citizen science project. We compared averaged REM estimates to those obtained via spatial capture–recapture (SCR) using data from nocturnal spotlight surveys. There was a high degree of concordance in REM-derived density estimates from averaged parameters versus those derived from survey-specific parameters. Averaged REM density estimates were also comparable to those produced by SCR at eight out of nine sites; hedgehog density was 7.5 times higher in urban (32.3km−2) versus rural (4.3km2) sites. Power analyses indicated that the averaged REM approach would be able to detect a 25% change in hedgehog density in both habitats with >90% power. Furthermore, despite the high start-up costs associated with the REM method, it would be cost-effective in the long term. The averaged REM approach is a promising solution to the challenge of large-scale and long-term species monitoring. We suggest including the REM as part of a citizen science monitoring project, where participants collect data and researchers verify and implement the required analysis.

Citation

Schaus, J., Uzal, A., Gentle, L. K., Baker, P. J., Bearman-Brown, L., Bullion, S., …Yarnell, R. W. (2020). Application of the Random Encounter Model in citizen science projects to monitor animal densities. Remote Sensing in Ecology and Conservation, 6(4), 514-528. https://doi.org/10.1002/rse2.153

• Journal Article Type: Article
• Acceptance Date: Feb 7, 2020
• Online Publication Date: Mar 19, 2020
• Publication Date: 2020-12
• Deposit Date: Mar 23, 2020
• Publicly Available Date: Mar 24, 2020
• Journal: Remote Sensing in Ecology and Conservation
• Electronic ISSN: 2056-3485
• Peer Reviewed: Peer Reviewed
• Volume: 6
• Issue: 4
• Pages: 514-528
• DOI: https://doi.org/10.1002/rse2.153
• Public URL: https://nottingham-repository.worktribe.com/output/4176376
• Publisher URL: https://zslpublications.onlinelibrary.wiley.com/doi/full/10.1002/rse2.153