Abstract

AbstractAbundance 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 theREMin 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 averagedREMestimates to those obtained via spatial capture–recapture (SCR) using data from nocturnal spotlight surveys. There was a high degree of concordance inREM‐derived density estimates from averaged parameters versus those derived from survey‐specific parameters. AveragedREMdensity estimates were also comparable to those produced bySCRat eight out of nine sites; hedgehog density was 7.5 times higher in urban (32.3 km−2) versus rural (4.3 km2) sites. Power analyses indicated that the averagedREMapproach 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 theREMmethod, it would be cost‐effective in the long term. The averagedREMapproach is a promising solution to the challenge of large‐scale and long‐term species monitoring. We suggest including theREMas part of a citizen science monitoring project, where participants collect data and researchers verify and implement the required analysis.

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